Geology Final - All Rocks

Magnetite

Magnetic High density Dark grey or black color

Magnets Steel

Hematite

Reddish brown color Dull luster High density Reddish brown streak

Steel Jewelry

Galena

Silvery-blue color High density Metallic luster Cubic crystals

Bullets Rechargeable Batteries

Copper

Copper color  Metallic luster Black/green corosion

Coins Electrical Wiring

Talc

Color varies from dark green to creamy white Hardness = 1 Smooth Texture

Baby Powder

Muscovite mica

Silvery tan color Plasticy luster One direction of cleavage Peels into sheets

Electrical Insulator Makeup

Graphite

Metallic Luster Dark grey color Low hardness

Industrial Lubricant Pencils

Sulfur

Yellow color Distinctive Smell

Medicine Fertilizer Explosives and Gunpowder

Halite

Salty taste Transparent, colorless crystals 3 directions of cleavage at 90 degrees

Table Salt De-icing Roads

Gypsum

Creamy White or Clear Color Hardness= 2

Ceramics Drywall

Potassium   Feldspar

Salmon pink color 2 directions of cleavage at 90 degrees Striation pattern

False Teeth Ceramics

Kaolinite

White color Sticks to your tongue Chalky feel

Clay Ceramics

Garnet

12 sided crystals Red, yellow, green colors

Sandpaper

Quartz

Hardness= 7 Variety of colors Conchoidal Fracture Hexagonal prism and pyramid crystal form

Semiconductors Watch Components

Corundum

Reddish brown to red or blue color Crystals are hexagonal prisms with flat ends Hardness= 9

Ruby Sapphire

Pyrite

Gold color Metallic luster Black streak High Density Cubic Crystals

Sulfuric Acid

Calcite

Transparent, colorless crystals 3 directions of cleavage Reacts with acid

Antacid

Andesite: Intermediate Silica, Aphanitic (Fine-Grained), Composite

Diorite: Intermediate Silica, Phaneritic (Coarse-Grained), Composite

Obsidian: Felsic, Composite

Rhyolite: Felsic, Aphanitic (Fine-Grained), Composite

Basalt: Mafic, Aphanitic (Fine-Grained), Shield

Gabbro: Mafic, Phaneritic (Coarse-Grained), Shield

Pumice: Felsic, Composite

Granite: Felsic, Phaneritic (Coarse-Grain), Composite

Slate (# 29)

Phyllite (#32)

Gneiss (# 34)

Schist (#36)

Quartzite (# 30)

Marble (#31)

Conglomerate

Sandstone

Shale

Limestone