Rhyolite
| Colour | Brown, Gray |
|---|
What is Rhyolite?
Rhyolite is the most silica-rich of volcanic rocks. It is generally glassy or fine-grained (aphanitic) in texture, but may be porphyritic, containing larger mineral crystals (phenocrysts) in an otherwise fine-grained groundmass. The mineral assemblage is predominantly quartz, sanidine, and plagioclase. It is the extrusive equivalent of granite.
How to identify Rhyolite
Rhyolite in different forms
Stones often confused with Rhyolite
Frequently asked questions
How hard is Rhyolite?
Rhyolite's hardness varies; see the property table above.
What colour is Rhyolite?
Rhyolite is typically brown, gray.