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Sphalerite
light tan, brownish white streak, fizzes, isometric
Sulfur
yellow, pale yellow streak, fingernail, orthorhombic
Pyrrhotite
bronze/red/brown, black streak, metallic, monoclinic
Chalcophyrite
brass yellow/gold, dull black streak (greenish), metallic, tetragonal
Pyrite
Striated cube-like crystals, blackish streak, isometric
Galena
metallic dark grey/black lead, HEAVY, dark grey shiny streak, nail, can have large crystals,
isometric
Chalcocite
dark grey, metallic, nail, monoclinic
Gold
Golden/yellow, metallic sheen, found in sparse quantities, isometric
Silver
silver, metallic sheen, sparse, isometric
Marcasite
metallic brown/gry/silver/brassy, black/brown streak, RADIAL GROWTH CRYSTALS, quartz
scratches, orthorhombic
Bornite
copper red/brown/puple, nail, metallic, grey/black streak (dull), orthorhombic
Molybdenite
very shiny blue/grey (metallic), same color streak, fingernail, hexagonal
Hematite
shiny black OR dull red/red-black, BROWN RED STREAKE, brittle and
diskc-like/blobby/layers, trigonal
Graphite
grey/silver/shiny, easily scratched and streaked, hexagonal, lighter than pyrolusite
Magnesite
white/brown, white streak, nail, trigonal
Calcite
Glassy, LOTS OF FIZZING, white streak, nail, trigonal
Halite
Glassy, white streak, SALTY, nail, isometric
Barite
White/shiny crystals, white streak, HEAVY, can be rose structured, nail, orthorhombic
Aragonite
White/grayish/brown, white streak, nail, HCL fizzing, forms include
striations/banded/radial needlelike, orthorhombic
Apatite
Pink/dark green/truquoise/maroon, too hard for streak, large crystals, sheen, hexagonal
Dolomite
whitish/yellowish crystals or grey, dull/slight sheen to crystals, HCL ON POWDER, nail,
trigonal
Dolomite
whitish/yellowish crystals or grey, dull/slight sheen to crystals, HCL ON POWDER, nail,
trigonal
Gypsum
white and shiny, LAYERS, SOFT (FINGERNAIL), monoclinic
Fluorite
Purple/turquoise, shiny/glassy, white streak, nail, isometric
Chromite
Brownish black, slight sheen, heavy, isometric
Rhodochrosite
Pinkish crystals, white streaks, slight sheen, nail, trigonal
Bauxite
White/yellow/pinkish, pearly lustor, POROUS, fingernail, streak is either red or white,
orthorhombic
Pyrolusite
Metallic black/blue-grey, black streak, dendritic/needles/columns, tetragonal
Siderite
Reddish/gray/brown, metallic sheen, white streak, nail, trigonal
Cuprite
Brown/red, copper red/brown streak, nail, isometric
Malachite
Light green/blue turquoise), light green streak, globular/needlelike, nail, monoclinic
Azurite
Dark indigo/blue, shiny crystals, pale blue sreak, nail, monoclinic
Rutile
Variety of colors, gray/black streak, ELONGATED crystals, tetragonal
Cinnabar
RED/brown/pink, BRIGHT RED-ORANGE STREAK, trigonal
Copper
red copper streak, blue/green when oxidized, isometric
Magnetite
MAGNETIC, metallic dark grey black, isometric
Corundum
Very hard, slight sheen, trigonal
Limonite
Brown, rust-colored streak, orthorhombic
Spinel
Black "colorless", GREY/WHITE STREAK, large crystals, isometric