Lab 1 minerals

Galena (2)

Metallic luster, silver color, heavy (dense), 3 directions of cleavage (90 degrees).

Graphite

Dull metallic luster, silver grey streak, greasy feel, writes on paper, low density

Magnetite

Magnetic, black, dull but ( metallic luster on fresh surface,) dense dark.

Quartz (7)

Clear, can have prismatic crystal (hexagonal), scratches glass, no cleavage (fracture).

Halite (6)

Clear, 3 directions of cleavage at 90 degrees, tastes salty.

Calcite (4)

Clear to white, 3 directions of cleavage not at 90 degrees, fizzes in acid.

Potassium Feldspar (15)

Pink color, striations, 2 directions of cleavage at 90 degrees, can scratch glass.

Pyrite (1)

Metallic luster, shiny gold color, cubic crystals, dark streak, heavy (dense).

Copper (36)

Copper color (w/ blackish-green corrosion), metallic luster.

Sulfur (24)

Yellow, smells like eggs, no cleavage.

Garnet (17)

Greenish yellow, 12-sided (dodecahedral) crystals, scratches glass.

Corundum (33)

Dark red color, can scratch glass and all other minerals, hexagonal crystals.

Muscovite (27)

Silvery grey, 1 direction of cleavage (peels into sheets), scratch with fingernail.

Biotite Mica (26)

Black-gold, 1 direction of cleavage.

Olivine (10)

Olivine (10)

Pryoxene

Black-green color, two directions of cleavage at 90 degrees, white streak.

Talc (3)

Pearly white to pale green, can be scratched with a fingernail, soapy feel.

Gypsum (25)

White, striated, can be scratched with a fingernail.

Kaolinite

Soft, powdery appearance, sticks to tongue.

Plagioclase Feldspar (16)

Whitish blue, two directions of cleavage at 90 degrees, scratches glass

Granite

Felsic, pheaneritic (coarse grained), and intrusive

Diorite

Intermediate, phaneritic (coarse grained), and intrusive

Gabbro

Mafic, phanerititc (coarse grained), and intrusive