geology minerals Flashcards
olivine
green, nonmetalic, scratches glass
pyrite
fools gold, brass yellow scratches glass
dark grey streak
magnetite
magnetic, dark grey to black
dark grey streak, scratches glass
hematite
silver specular appearance
dark red streak
red to brown streak,does not scratch glass
chalcopyrite
color: brass yellow, brass green
streak: dark grey
glass: no
galena
color: silver and grey, high specific gravity
streak: dark grey
glass: no
graphite
color: black to dark grey, rubs off on hands
streak: dark grey
glass: no
sphalerite
color: brown to yellow, may be shiny
streak: light yellow, smells like sulfur
glass: no
copper
color: tarnishes dark, rocky looking
brown or green
glass: no
quartz
hexagonal prisms, crystal
glass: yes
garnet
soccer ball crystals- net, transparent
glass: yes
augite
opague black with greenish tint
glass: barely
g-greener than hornblende
hornblende
opgague black
glass: barely
limonite
color: dull earth luster
streak: rusty brown, yellow
glass: no
fingernail: no
fluorite
color: any, purple, white clear cubes
big crystals, not too much form
glass: no
fingernail: no
biotite
color: black
flexible sheets
glass: no
fingernail: no
chlorite
color: dull green
streak: greenish to white
plagioclase
color: white to grey
parallel striations in some
glass: barely
orthoclase
color: pink to light brown, some white, may have veins
glass: barely
dolomite
color: colorless or can be purplee blue green etc
forms in cubes
glass: no
fingernail: cannot, no
calcite
color: colorless, white yellow, reacts to acid!
muscovite
color: colorless, yellow, brown
thin flexible sheets
could be shiny
halite
color: colorless, yellow brown, blue green
transparent
cubes, salty
glass: no
fingernail: no
gypsum
colorless to white, bladed crystals
clay
color: earthy white
fingernail: may be scratch
talc
color: white grey green soapy color
fingernail: may be scratch
sulfur
yellow, smells like rotten eggs
