Final Exam Flashcards
1
Q
How to identify sanidine
A
Carlsbad (simple) twinning and a low 2V angle
2
Q
How to identify orthoclase
A
Carlsbad (simple) twinning and a high 2V angle
3
Q
How to identify microcline
A
Both albite twinning and pericline twinning (cross-hatched or tartan twinning)
4
Q
How to identify plagioclase
A
Albite twinning (or polysynthetic twinning)
5
Q
How to identify perthitic texture
A
2 feldspars together with a K-spar host with Na-spar exsolution lamellae
6
Q
How to identify antiperthitic texture
A
Na-spar host with K-spar exsolution lamellae
