ROCKS N FUELS PART 1

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Last updated 1:42 PM on 8/23/26
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19 Terms

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Minerals

  1. Inorganic

  2. Solid

  3. Ordered internal structure

  4. Definite chemical composition

  5. Naturally occurring


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Rocks

  1. Solid

  2. Inorganic and organic

  3. Naturally occurring

  4. Made of minerals


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Igneous Rock

TYPES OF ROCK

  • Formed when MAGMA OR LAVA COOL TO A SOLID FORM, glass or masses of tightly inter-grown mineral crystals.

  • COOLING AND SOLIDIFICATION

  • Classified based on:

    • Origin

    • Textures

    • Composition


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Origin

  • INTRUSIVE/PLUTONIC

  • EXTRUSIVE/VOLCANIC


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Intrusive or Plutonic

ORIGIN

Formed when MAGMA INSIDE EARTH AND TENDS TO TAKE A LONG TIME TO SOLIDIFY INTO ROCK.

  • Has PHANERITIC TEXTURES

  • EX: GRANITE & PERIDOTITE


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Extrusive or Volcanic

ORIGIN

FORMED FROM LAVA IN EARTH’S SURFACE and tends to SOLIDIFY QUICKLY.

  • Common textures: APHANITIC AND PROPHYRITIC

  • EX: OBSIDIAN, BASALT, RHYOLITE


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Texture

Based on the SIZE OF CRYSTALS

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Phaneritic

TEXTURES

  • COARSE GRAINED

  • FORMING LARGE INTERLOCKING CRYSTALS


<p>TEXTURES</p><ul><li><p><strong>COARSE GRAINED</strong></p></li><li><p><strong>FORMING LARGE INTERLOCKING CRYSTALS</strong></p></li></ul><p></p>
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Porphyritic

TEXTURES

  • Formed through TWO STAGES OF CRYSTALLIZATION WHERE MAGMA PARTLY COOLED BELOW SURFACE OF THE EARTH providing time for large crystals to grow. (PHENOCRYSTS)

  • GROUNDMASS: BEFORE IT IS EXTRUDED TO SURFACE FORMING FINE GRAINED MATRIX


<p>TEXTURES</p><ul><li><p>Formed through <strong>TWO STAGES OF CRYSTALLIZATION WHERE MAGMA PARTLY COOLED BELOW SURFACE OF THE EARTH </strong>providing time for large crystals to grow.<strong> (PHENOCRYSTS)</strong></p></li><li><p><strong>GROUNDMASS: BEFORE IT IS EXTRUDED TO SURFACE FORMING FINE GRAINED MATRIX</strong></p></li></ul><p></p>
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Phenocrysts

PORPHYRITIC

LARGELY FORMED CRYSTALS THAT TAKES TIME

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Groundmass

PORPHYRITIC

  • FORMING GINE GRAINED MATRIX


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Aphanitic

TEXTURES

  • FINE GRAINED

  • MINERALS ARE NOT VISIBLE TO NAKED EYE

  • Relatively FAST RATES OF COOLING/SOLIDIFICATION prevent the formation of large crystals.


<p><strong>TEXTURES</strong></p><ul><li><p><strong>FINE GRAINED</strong></p></li><li><p><strong>MINERALS ARE NOT VISIBLE TO NAKED EYE</strong></p></li><li><p>Relatively <strong>FAST RATES OF COOLING/SOLIDIFICATION</strong> prevent the formation of large crystals.</p></li></ul><p></p>
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Glassy

TEXTURES

  • NATURAL GLASS WITH VERY FEW CRYSTALS

  • FORMED BY VERY RAPID COOLING


<p>TEXTURES</p><ul><li><p><strong>NATURAL GLASS WITH VERY FEW CRYSTALS</strong></p></li><li><p>FORMED BY <strong>VERY RAPID COOLING</strong></p></li></ul><p></p>
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Vesicular

TEXTURES

These are VOIDS CREATED BY RAPID COOLING WHICH CAUSE AIR BUBBLES TO BE TRAPPED INSIDE

<p>TEXTURES</p><p>These are <strong>VOIDS CREATED BY RAPID COOLING WHICH CAUSE AIR BUBBLES TO BE TRAPPED INSIDE</strong></p>
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Pyroclastic

TEXTURES

It contains PIECES OF ASH, OTHER MOLTEN BLOBS EMBEDDED IN THEM.

<p>TEXTURES</p><p>It contains <strong>PIECES OF ASH, OTHER MOLTEN BLOBS EMBEDDED IN THEM.</strong></p>
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Felsic

COMPOSITION

  • GRANITIC: > 65% silica

  • GENERALLY LIGHT COLORED


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Intermediate

COMPOSITION

  • ANDESITIC: 55-65% SILICA

  • Generally MEDIUM COLORED (GRAY)


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Mafic

COMPOSITION

  • BASALTIC: 45 - 55% silica

  • USUALLY DARK COLORED


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Ultramafic

COMPOSITION

  • < 45% Silica,

  • GENERALLY VERY DARK COLORED