Amphibole
Luster: viteous
Streak: none
Hardness: Scratches glass
Cleavage
Color: black, dark gray
Biotite
Luster: vitreous
Streak: none
Harness: won't scratch glass, breaks into sheets
Cleavage
Color: dark brown, black
Calcite
Luster: glassy
Streak: none
Hardness: won't scratch glass
Cleavage (rhombus)
Color: white, colorless, clear
Cryptocrystalline Quartz
Luster: waxy
Streak: none
Hardness: scratches glass
Conchoidal fracture
Color: banded, darker colors
Galena
Luster: metallic
Streak: dark gray
Hardness: won't scratch glass
Cleavage
Color: silver, gray, black
Gypsum
Luster: dull to glassy
Streak: none
Hardness: won't scratch glass
Cleavage or fracture
Color: white, gray, pink, clear
Halite
Luster: glassy
Streak: none
Hardness: won't scratch glass
Cleavage (cube)
Color: clear, transparent
*Salty taste
Hematite
Luster: dull, earthy
Streak: reddish brown
Hardness: won't scratch glass
Fracture
Color: red, brown, black, dark gray
Kaolonite
Luster: dull
Streak: none
Hardness: won't scratch glass
Fracture
Color: white
*Think chalk or talc
Limonite
Luster: dull, earthy
Streak: orange-brown
Hardness: won't scratch glass
Fracture
Color: yellow, orange, brown, black
Magnetite
Luster: dull to metallic
Streak: black, gray
Hardness: Scratches glass
Cleavage or Fracture
Color: black, dark gray
*Magnetic
Muscovite
Luster: vitreous, glassy
Streak: none
Hardness: won't scratch glass, breaks into sheets
Cleavage
Color: yellow, gold, clear, white
Olivine
Luster: dull to vitreous
Streak: none
Hardness: scratches glass
Fracture
Color: olive green
Plagioclase Feldspar
Luster: pearly, vitreous
Streak: none
Hardness: scratches glass
Cleavage
Color: white, blue-gray, black
*Reddish striations on some samples
Potassium Feldspar
Luster: pearly, vitreous
Streak: none
Hardness: scratches glass
Cleavage
Color: pink, white, green
Pyrite
Luster: metallic
Streak: green-black
Hardness: scratches glass
Fracture
Color: gold, brown
Pyroxene
Luster: dull to vitreous
Streak: none
Hardness: scratches glass
Cleavage
Color: black, dark green, brown
Quartz
Luster: glassy, vitreous
Streak: none
Hardness: scratches glass
Fracture
Color: white, pink, purple
Hello,
ReplyDeleteI know this blog is super old, and it's unlikely anyone's going to read this, but I'd like to know if these images are in the public domain, or under what license?
Thanks