light to dark green, usually in OLIVINE granular masses, harder than glass (H=6) black, strong magnetic, irregular MAGNETITIE masses or chunks, harder than glass (H=6) colorless, green, or purple, glassy, FLUORITE 4 good cleavage directions, harder than penny (H=4) black to brown, one perfect cleavage BIOTITE MICA (basal), thin flexible sheets, same hardness as fingernail (H=2.5) green, basal cleavage, platy masses CHLORITE or fine particles, same hardness as fingernail (H=2.5) red to streak, earth, softer HEMATITE than fingernail (H=1) green, basal cleavage, platy masses CHLORITE or fine particles same hardness as fingernail (H=2.5) gray, pink or white, greasy or TALC soapy feel, softer than fingernail (H=1) light to dark pink, blocky, 2 cleavage ORTHOCLASE planes at almost 90o harder than nail FELDSPAR (H=6) gray to white, blocky, 2 cleavage planes SODIUM FELDSPAR at almost 90o harder than nail (H=6) (OLIGOCLASE)
light to dark green, usually in granular masses, harder than glass (H=6) OLIVINE black, strong magnetic, irregular masses or chunks, harder than glass (H=6) MAGNETITIE colorless, green, or purple, glassy, 4 good cleavage directions, harder than penny (H=4) FLUORITE black to brown, one perfect cleavage (basal), thin flexible sheets, same hardness as fingernail (H=2.5) BIOTITE MICA green, basal cleavage, platy masses or fine particles, same hardness as fingernail (H=2.5) CHLORITE red to streak, earth, softer than fingernail (H=1) HEMATITE green, basal cleavage, platy masses or fine particles same hardness as fingernail (H=2.5) CHLORITE gray, pink or white, greasy or soapy feel, softer than fingernail (H=1) TALC light to dark pink, blocky, 2 cleavage planes at almost 90o harder than nail (H=6) ORTHOCLASE FELDSPAR gray to white, blocky, 2 cleavage planes at almost 90o harder than nail (H=6) SODIUM FELDSPAR (OLIGOCLASE)
classification%20key.docx