Abis Notes

Question 1

Mica in a thin section both xpl and ppl

Answer 1

Ppl- Muscovite is transplant with one cleavage if it is a biotite then its red and brown with one cleavage
Xpl- extinction and biofringence

Question 2

Quarts in a thin section in both ppl and xpl

Answer 2

Ppl= transplant not change
Xpl= extinction of 90degree, white/grey

Question 3

Grain boundary

Answer 3

The line of contact between mineral crystals in a rock

Question 4

Mimosa scale of hardness

Answer 4

• talc ( softest)
  -gypsum
  -calcite
  -fluorite
  -apatite
  -feldspar
  -quartz
  -topaz
  -corundum
• diamond (hardest)

Question 5

Quartz

Answer 5

-white/grey
-no streak
-hardness of 7

Question 6

Feldspar

Answer 6

-pink/white/grey
-hardness 6
-white streak