lab 1 key terms

Question 1

diagnostic properties of pyroxene

Answer 1

dark green, black, browns
two good cleavages at 90
vitreous
no twinning

Question 2

diagnostic properties of amphibole

Answer 2

dark green, black, brown
2 good planes at 56 and 124
vitreous

Question 3

diagnostic properties of plagioclase

Answer 3

colourless, cloudy, white, grey
two good cleavages intersecting at 90
vitreous
polysythetic twinning and carlsbad
tabular and equant

Question 4

diagnostic properties of k-spar

Answer 4

pink, white, gray, colourless/cloudy
two good cleavages at 90
vitreous
tartan twinning, carlsbad
blocky or stubby prismatic

Question 5

diagnostic properties of quartz

Answer 5

colourless when pure
no cleavage
vitreous
euhedral

Question 6

diagnostic properties of olivine

Answer 6

shades of green
no cleavage
vitreous
euhedral to anhedral

Question 7

diagnostic properties of tourmaline

Answer 7

black, pink-green, blue-green, pink-red
no cleavage

Question 8

diagnostic properties of talc

Answer 8

white, grey, colourless
very soft
pearly