Geology Lab

hornblende

Good cleavage, black streak, good cleavage at 56 and 124 angle, nonmetallic,

Amethyst

nonmetallic, white streak, fractures

Massive Gypsum

color is pink, white streak, nonmetallic

Dolomite

nonmetallic, white streak, excellent cleavage in three directions, light pink color

bauxite

nonmetallic, streak yellowish brownish, color brownish grayish

Quartz

nonmetallic, greater than glass, fracture, white streak

Oolitic Hematite

fracture, nonmetallic, streak red

flint

nonmetallic, gray streak, dark grey color

fluorite

nonmetallic, light green color, white streak

Calcite

nonmetallic, white color, white streak, excellent cleavage in three directions not at 90 degrees

Orthoclase

nonmetallic, cleavage excellent in two directions at nearly 90 degrees, white streak

olivine

nonmetallic, fracture, white streak

Muscovite

streak white, nonmetallic, cleavage excellent in one direction, breaks into flakes, one of the micas

Magnetite

nonmetallic, fracture, attracted to a magnate, dark grey

Corundum

fractures, white streak, brownish black

Barite

nonmetallic, white streak, fractures

biotite

nonmetallic, fractures, greenish-grey streak

chert

nonmetallic, fractures, white streak

graphite

metallic, less than a fingernail, grey streak, cleavage in one direction

Plagioclase

two 90 degree angels, nonmetallic, grey streak

sphalerite

nonmetallic, brown-red streak, powdery form smells like eggs when scrat

ched

Halite

nonmetallic, white streak, three 90 angels

chalcopyrite

metallic, fracture, black-grey streak

augite

nonmetallic, grey streak, grey color

selenite

good cleavage, nonmetallic, white streak,

talc

white streak, nonmetallic, greyish color

hematite

metallic, brown streak, fracture

Native Sulfur

nonmetallic, yellow-white streak, same strength as fingernail