GEOS1111 Rock Forming Minerals (Info-Name)

Question 1

White/Colourless Streak, Vitreous, Conchoidal Fracture, Prismatic Habit

Answer 1

Quartz

Question 2

White Streak, Vitreous/Sub Vit., 2@90 1 perfect cleavage, Tabular/Platy Habit

Answer 2

Orthoclase

Question 3

White/Colourless Streak, Vitreous, Multiple Twinning

Answer 3

Plagioclase

Question 4

Brown/Black Colour, Light Brown Streak, Vitreous, Transparent/Translucent, 2.5, 1 basal, platy/micaceous

Answer 4

Biotite

Question 5

Silvery White/Colourless, Vitreous, Transparent-Opaque,2.5, 1 basal, platy/follated

Answer 5

Muscovite

Question 6

Dark Green-Black, Vitreous, Opaque, >6.5, 2@60 & 120, Prismatic/Columnar/Fibrous

Answer 6

Hornblende

Question 7

Brown-Green/Blacky, Vitreous, Opaque, >6.5, 2@90, Stubby

Answer 7

Augite

Question 8

Olive Green, Vitreous, Transparent/Translucent, Conchoidal, Massive Granular

Answer 8

Olivine

Question 9

Colourless/White, Vitreous/Pearly/Earthy, Transparent/Translucent, 3, 3@60, Rhombohedral

Answer 9

Calcite

Question 10

Greyish-black/Iron-Black, Black Streak, Sub Metallic, Opaque, Earthy habit

Answer 10

Magnetite

Question 11

Reddish-brown/black/steel, metallic, massive earthy habit

Answer 11

Hematite

Question 12

White-appley green, white streak, pearly/greasy, opaque, 1, basal, platy/follated

Answer 12

Talc

Question 13

White, White streak, dull/earthy, opaque, 2-2.5, basal, massive earthy habit

Answer 13

Kaolinite