8 Modern and Historical Obsidian Uses
Obsidian uses include making prehistoric stone tools. Photo credit: Ismoon (talk) 21:26, 8 June 2018 (UTC), CC BY-SA 4.0, via Wikimedia Commons.
Michael Smith
Obsidian Composition, Colors and Varieties
Obsidian is a natural rhyolite volcanic glass that forms when silica-rich, highly viscous lava or magma rapidly cools. A natural
What Is Greenhouse Effect, Its Causes, Impact and Mitigation
Overwhelming evidence shows global warming is happening, and the rate is exponentially increasing. Lindsey & Dahlman (2024) note that since
Dacite Properties, Composition and Uses
Dacite is a fine-grained, light-colored volcanic rock with a felsic composition. Felsic rocks are silica-rich and dominated by light-colored elements
How Does Dacite and Andesite Differ?
Dacite and andesite are both fine-grained volcanic and extrusive igneous rocks. Volcanic or extrusive igneous rocks form when magma cools
Monzonite Properties, Composition and Uses
Monzonite is a coarse-grained, plutonic, or intrusive igneous rock with an intermediate composition. Plutonic or intrusive rocks form deep inside
Quartz Monzonite Composition and Uses
Quartz monzonite is a coarse-grained, felsic plutonic, or intrusive igneous rock. Felsic rocks are light-colored rocks rich in lighter elements
What Is Porphyritic Texture in Rocks and How Does It Form
Pyric (US) or porphyritic texture is an igneous rock texture with two distinctive crystal sizes, i.e., bimodal crystal sizes. One
Porphyry In Geology and Rock Examples?
A porphyry (plural porphyries) is an igneous rock with large, well-formed mineral grains set in a finer-grained matrix. Such rocks
Porphyritic Andesite Rock Composition and Formation
Porphyritic andesite rocks have large, well-formed crystals or phenocrysts of mostly plagioclase and, less often, hornblende and pyroxene. Less common