Module 2.1: Minerals

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82 Terms

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Minerals

Naturally occurring inorganic solids, with a specific chemical composition and a crystalline structure

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  • Naturally occurring

  • Inorganic

  • Homogenous

  • Definite chemical composition

  • Solid-ordered internal structure

The five properties of minerals

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Mineraloid

Naturally occurring, inorganic compound, that is amorphous and does not exhibit crystallinity

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Mineral habit/form

  • External expression of a mineral’s internal orderly arrangement of atoms

  • The shapes and aggregates that a certain mineral is likely to form

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Acicular

Mineral habit composed of slender, needle-like crystals

<p>Mineral habit composed of slender, needle-like crystals</p>
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Acicular

Mineral habit composed of slender, needle-like crystals

<p>Mineral habit composed of slender, needle-like crystals</p>
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Banded

Mineral habit appearing as alternating layers or bands of different colors and/or textures

<p>Mineral habit appearing as alternating layers or bands of different colors and/or textures</p>
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Banded

Mineral habit appearing as alternating layers or bands of different colors and/or textures

<p>Mineral habit appearing as alternating layers or bands of different colors and/or textures</p>
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Botryoidal

Mineral habit that is characterized by a globular or rounded shape bunched together

<p>Mineral habit that is characterized by a globular or rounded shape bunched together</p>
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Botryoidal

Mineral habit that is characterized by a globular or rounded shape bunched together

<p>Mineral habit that is characterized by a globular or rounded shape bunched together</p>
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Cubic

Mineral habit that displays faces meeting at 90-degree angles due to underlying crysta structure

<p>Mineral habit that displays faces meeting at 90-degree angles due to underlying crysta structure</p>
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Cubic

Mineral habit that displays faces meeting at 90-degree angles due to underlying crysta structure

<p>Mineral habit that displays faces meeting at 90-degree angles due to underlying crysta structure</p>
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Druzy

Mineral habit wherein a surface is coated with fine crystals

<p>Mineral habit wherein a surface is coated with fine crystals</p>
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Druzy

Mineral habit wherein a surface is coated with fine crystals

<p>Mineral habit wherein a surface is coated with fine crystals</p>
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Fibrous

Mineral habit which grows in long, thin, hair-like crystals

<p>Mineral habit which grows in long, thin, hair-like crystals</p>
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Fibrous

Mineral habit which grows in long, thin, hair-like crystals

<p>Mineral habit which grows in long, thin, hair-like crystals</p>
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Geode

Mineral habit with a hollow, vaguely spherical rock with a lining of mineral matter

<p>Mineral habit with a hollow, vaguely spherical rock with a lining of mineral matter</p>
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Geode

Mineral habit with a hollow, vaguely spherical rock with a lining of mineral matter

<p>Mineral habit with a hollow, vaguely spherical rock with a lining of mineral matter</p>
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Prismatic

Mineral habit characterized by elongated, prism-like crystals with parallel faces

<p>Mineral habit characterized by elongated, prism-like crystals with parallel faces</p>
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Prismatic

Mineral habit characterized by elongated, prism-like crystals with parallel faces

<p>Mineral habit characterized by elongated, prism-like crystals with parallel faces</p>
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Tabular

Mineral habit describes crystals that are flat and plate-like

<p>Mineral habit describes crystals that are flat and plate-like</p>
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Tabular

Mineral habit describes crystals that are flat and plate-like

<p>Mineral habit describes crystals that are flat and plate-like</p>
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Luster

It is the ability of minerals to reflect light

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Metallic

Luster that refers to a reflective, opaque appearance similar to polished metal

<p>Luster that refers to a reflective, opaque appearance similar to polished metal</p>
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Metallic

Luster that refers to a reflective, opaque appearance similar to polished metal

<p>Luster that refers to a reflective, opaque appearance similar to polished metal</p>
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Glassy/vitreous

Luster that appears as a bright, smooth, reflection of transparent or transluscent material that appears as glass

<p>Luster that appears as a bright, smooth, reflection of transparent or transluscent material that appears as glass</p>
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Glassy/vitreous

Luster that appears as a bright, smooth, reflection of transparent or transluscent material that appears as glass

<p>Luster that appears as a bright, smooth, reflection of transparent or transluscent material that appears as glass</p>
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Resinous

Luster that resembles that of amber

<p>Luster that resembles that of amber</p>
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Resinous

Luster that resembles that of amber

<p>Luster that resembles that of amber</p>
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Greasy

Luster that appears as if mineral is coated in oil or grease

<p>Luster that appears as if mineral is coated in oil or grease</p>
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Greasy

Luster that appears as if mineral is coated in oil or grease

<p>Luster that appears as if mineral is coated in oil or grease</p>
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Pearly

Luster that resembles the inside of a mollusk shell

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Pearly

Luster that resembles the inside of a mollusk shell

<p>Luster that resembles the inside of a mollusk shell</p>
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Color

  • Characteristic caused by the absorption or lack of absorption of various wavelengths of light

  • Can also be caused by impurities which makes it not a good diagnostic property

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Malachite

  • Mineral habit - acicular

  • Luster - glassy/vitreous

  • Color - dark green

<ul><li><p>Mineral habit - acicular</p></li><li><p>Luster - glassy/vitreous</p></li><li><p>Color - dark green</p></li></ul>
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Olivine

  • Mineral habit - druzy

  • Luster - glassy/vitreous

  • Color - light green

<ul><li><p>Mineral habit - druzy</p></li><li><p>Luster - glassy/vitreous</p></li><li><p>Color - light green</p></li></ul>
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Sulfur

  • Mineral habit - druzy

  • Luster - greasy

  • Color - yellow

<ul><li><p>Mineral habit - druzy</p></li><li><p>Luster - greasy</p></li><li><p>Color - yellow</p></li></ul>
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Fluorite

  • Mineral habit - cubic

  • Luster - resinous

  • Color - purple (but can be blue)

<ul><li><p>Mineral habit - cubic</p></li><li><p>Luster - resinous</p></li><li><p>Color - purple (but can be blue)</p></li></ul>
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Azurite

  • Mineral habit - prismatic

  • Luster - glassy/vitreous

  • Color - blue

<ul><li><p>Mineral habit - prismatic</p></li><li><p>Luster - glassy/vitreous</p></li><li><p>Color - blue</p></li></ul>
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Quartz (left to right): milky quartz, citrine, green aventurine, smoky quartz, rose quartz, amethyst, sapphire quartz, milky quartz

Corundrum

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Streak

  • It is the color of a mineral in powdered form

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Metals

  • These minerals usually have a dark streak

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Crocoite: yellow

Chalcopyrite: black

Cinnabar: red

Molybdenite: gray

Identify the mineral and its streak

<p>Identify the mineral and its streak</p>
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Hardness

  • It is the property described as the resistance of minerals to abrasion or scratching

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Talc → Gypsum (fingernails) → Calcite (copper coin) → Fluorite → Apatite (knife/glass) → Feldspar (steel) → Quartz → Topaz → Corundum → Diamond

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Cleavage

The tendency of a mineral to break in particular directions due to zones of weakness in the crystal structure

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Basal/platy: muscovite

Cleavage where the mineral breaks along one direction of a set of parallel planes, resulting in thin, flat sheets (also identify mineral)

<p>Cleavage where the mineral breaks along one direction of a set of parallel planes, resulting in thin, flat sheets (also identify mineral)</p>
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Prismatic: feldspar

Cleavage where the mineral breaks along two planes (also identify mineral)

<p>Cleavage where the mineral breaks along two planes (also identify mineral)</p>
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Prismatic: hornblende

Cleavage where the mineral breaks along two planes (also identify mineral)

<p>Cleavage where the mineral breaks along two planes (also identify mineral)</p>
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Cubic: halite

Cleavage where the mineral breaks in three directions (also identify mineral)

<p>Cleavage where the mineral breaks in three directions (also identify mineral)</p>
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Cubic: calcite

Cleavage where the mineral breaks in three directions (also identify mineral)

<p>Cleavage where the mineral breaks in three directions (also identify mineral)</p>
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Octahedral: fluorite

Cleavage where the minerals break in four directions (also identify the mineral)

<p>Cleavage where the minerals break in four directions (also identify the mineral)</p>
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Fractures

Irregular breakages that occur when bond strengths in a crystal structure are equal in all directions

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Conchoidal fracture

Fracture with smooth, curved surfaces, which are typically concave

<p>Fracture with smooth, curved surfaces, which are typically concave</p>
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Irregular fracture

Fracture with a rough, uneven break, rather than straight lines or specific patterns

<p>Fracture with a rough, uneven break, rather than straight lines or specific patterns</p>
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Reaction to chemicals → magnetism → fluorescence → feel → taste → double refraction → tenacity → odor

Other properties (from top to bottom, left to right)

<p>Other properties (from top to bottom, left to right)</p>
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Silicates

  • Largest group of minerals (90% of the Earth’s crust)

  • Contain silicon and oxygen

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Feldspar and quartz

Two most common silicate minerals

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Silicon-oxygen tetrahedron

Building block of silicate minerals

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Silicates

What mineral group?

<p>What mineral group?</p>
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Carbonates

  • Mineral group with a polyatomic anion with the formula (CO2)-3

  • Has a trigonal planar molecular structure consisting of a carbon atom surrounded by three oxygen atoms

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Calcite

Formula is CaCO3 and is the most common carbonate mineral

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Carbonates

What mineral group?

<p>What mineral group?</p>
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Native elements

  • Mineral group that contain atoms of only one type of element

  • Only a small number of minerals are found in this category

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Halides

Mineral group with halogens bonded with various metallic atoms

<p>Mineral group with halogens bonded with various metallic atoms</p>
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Oxides

  • Mineral group that contain one or two metal elements combined with oxygen

  • Many important metals are found in this form

<ul><li><p>Mineral group that contain one or two metal elements combined with oxygen</p></li><li><p>Many important metals are found in this form</p></li></ul>
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Phosphates

  • Mineral group that are similar in structure to silicate minerals

  • Phosphorus, arsenic, or vanadium bond to oxygen to form a tetrahedron

<ul><li><p>Mineral group that are similar in structure to silicate minerals</p></li><li><p>Phosphorus, arsenic, or vanadium bond to oxygen to form a tetrahedron</p></li></ul>
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Sulfates

  • Minerals that contain sulfur atoms bonded to oxygen atoms

  • They form where salt water evaporates

  • Contains many different minerals but only a few are common

<ul><li><p>Minerals that contain sulfur atoms bonded to oxygen atoms</p></li><li><p>They form where salt water evaporates</p></li><li><p>Contains many different minerals but only a few are common</p></li></ul>
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Sulfides

  • Formed when metallic elements combined with sulfur but without oxygen

<ul><li><p>Formed when metallic elements combined with sulfur but without oxygen</p></li></ul>
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Pyrite

  • Mineral made of iron sulfide which is also known as fool’s gold

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Plagioclase feldspars

Most abundant mineral in the crust

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Quartz, mica, feldspar, olivine

Identify minerals (left to right, top to bottom)

<p>Identify minerals (left to right, top to bottom)</p>
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Pyroxene, olivine, calcite, clay

Identify minerals (left to right, top to bottom)

<p>Identify minerals (left to right, top to bottom)</p>
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Carbonates, hematite

Identify minerals (left to right, top to bottom)

<p>Identify minerals (left to right, top to bottom)</p>
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Ore

Useful metallic (and non-metallic) minerals that can be extracted and which contain useful substances

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Bauxite, chromite, bornite chalcopyrite, native gold, hematite, sphalerite

Identify the ore

<p>Identify the ore</p>
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Gemstones

Any of various minerals highly prized for beauty, durability, and rarity

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Luzonite

Mineral named after its occurrence in Mankayan, Luzon Island

<p>Mineral named after its occurrence in Mankayan, Luzon Island</p>
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Prehnite

Named after Dutch colonel, Hendrik von Prehn for discovering the stone in Cape of Good Hope, South Africa

<p>Named after Dutch colonel, Hendrik von Prehn for discovering the stone in Cape of Good Hope, South Africa</p>
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Pigeonite

Named after the type locality, Pigeon Point, Minnesota, USA

<p>Named after the type locality, Pigeon Point, Minnesota, USA</p>
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Cummingtonite

Named after the town of Cummington, Massachusetts

<p>Named after the town of Cummington, Massachusetts</p>
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Jadarite

Similar composition to Kryptonite, named after the Jadar Basin, Serbia

<p>Similar composition to Kryptonite, named after the Jadar Basin, Serbia</p>