Lab 2 Flashcards
(9 cards)
1
Q
Texture glassy
A
No crystals, conchoidal fracture
2
Q
Texture vesicular
A
Crystals aren’t common, gas bubbles present
3
Q
Texture pyroclastic
A
Fragments and glass shards, crumbled easily
4
Q
Texture aphanitic
A
Microscopic crystals not visible, uniform coloration
5
Q
Texture porphyritic (Fine)
A
Aphanitic background with some crystals that didn’t mix (diorite)
6
Q
Porphyritic (Coarse)
A
Large and multiple crystalline ground mass (granite)
7
Q
Texture Phaneritic
A
Small uniform crystals of different minerals.
8
Q
Texture pegmatitic
A
Crystals larger than 2cm
9
Q
Composition
A
Felsic(pink or light gray)
Intermediate(medium or gray)
Mafic(dark gray to black)
Ultramafic(green)
