Geology Minerals

Geology Minerals Images And Descriptions Of 28 Basic Minerals.
  
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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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