Geology Minerals

Images And Descriptions Of 28 Basic Minerals.
Created Oct 3, 2010
by chelsasaurusrex
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Side ASide B
Hornblende

Black to green, 2-D not at right angles (do not confuse with augite)
Kaolinite

looks like chalk, no HCI reaction
Biotite

Black, elastic, 1-D, perfect cleavage
Chlorite

greenish, flexible, 1-D (look for small flakes)
Halite

transparent, soft, 3-D perfect (cubic)
Flourite

soft, 4-D
Galena

Metallic, hi s.g., 3-D perfect  (cubic)
Muscovite

colorless, silvery, elastic, 1-D perfect cleavage
Chalcopyrite

metallic, yellowish, soft, no cubes
Sphalerite

6-D, yellowish where damaged, resinous
Quartz

transparent, translucent, hard, no cleavage
Augite

green to black, 2-D at right angles
Olivine

green and glassy aggregates, no cleavage
Pyrite

metallic, yellowish, hard
Limonite

earthy, yellowish-brown to orange streak is diagnostic
Hematite

red-brown streak, variety of habitats and hardness
Plagioclase

striations, 2-D at right angles
Orthoclase

no striations, 2-D at right angles
Talc

feels greasy, soapy, very soft 1-D
Calcite

3-D rhombohedral, HCI reaction
Gypsum

Very soft, 3-D cleagave
Garnet

spherical faceted crystals, no cleavage, variety of colors
Magnetite

metallic, magnetic
Corundum

barrel-shaped hexagonal habit, h=9
Dolomite

3-D rhombohedral, power reacts with HCI
Serpentine

green, waxy some samples fibrous
Copper

soft and malleable, reddish streak/color, hi s.g.
Tourmaline

Elongate trigonal crystals (cross section), hard, no cleavage


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