obsidian Comparison Table

Meteorites View all facts Glossary Help

Next aphanitic rock: cryptocrystalline rock Up: aphanitic rock, holohyaline rock, volcanic rock Previous aphanitic rock: microcrystaline rock

obsidian comparison table

Subject has texture has composition has definition has grain size has crystalinity has solidification mechanism has solidification timescale is a kind of

aphanitic rock a rock with grains too small to see or identify with either the unaided eye or a low power lens too small to see with unaided eye or low power lens rock

holohyaline rock glass 0 % rock

volcanic rock silicates (with very few exceptions) extrusion onto the surface of the planet or asteroid via a volcanic eruption very rapid igneous rock

obsidian glass silicates (with very few exceptions) too small to see with unaided eye or low power lens 0 % extrusion onto the surface of the planet or asteroid via a volcanic eruption very rapid aphanitic rock

Subject	has texture	has composition	has definition	has grain size	has crystalinity	has solidification mechanism	has solidification timescale	is a kind of
aphanitic rock			a rock with grains too small to see or identify with either the unaided eye or a low power lens	too small to see with unaided eye or low power lens				rock
holohyaline rock	glass				0 %			rock
volcanic rock		silicates (with very few exceptions)				extrusion onto the surface of the planet or asteroid via a volcanic eruption	very rapid	igneous rock
obsidian	glass	silicates (with very few exceptions)		too small to see with unaided eye or low power lens	0 %	extrusion onto the surface of the planet or asteroid via a volcanic eruption	very rapid	aphanitic rock

Next aphanitic rock: cryptocrystalline rock Up: aphanitic rock, holohyaline rock, volcanic rock Previous aphanitic rock: microcrystaline rock