lab 5 key terms

Question 1

devitrify

Answer 1

The process by which volcanic glass whihc is origanlly amporhous, gradually transforms into a crystalline structure over time.

Question 2

diabase

Answer 2

dolerite
intrusive igneous rock with a grain size between gabbro and basalt.
has philic texture

Question 3

ophitic texture

Answer 3

texture of mafic igneous rocks
, especially diabase
occurs when elongate plagioclase crystals are partially or completely enclosed by larger clinopyroxene crystals.
interlocking structure.

Question 4

tuff

Answer 4

volcanic rock made of consolidated ash, lapilli and pumice fragments
soft, crumbly and porous

Question 5

welded tuff

Answer 5

tuff that experienced high temperatures and compaction after deposition
harder, more compact, may show fiamme (flattened, stretched, pumice fragments)

Question 6

amydalodial

Answer 6

a texture found in volcanic rocks where gas vesicles filled with secondary minerals after solidifcation
the vesicles are called amygdules.