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Results for rhyolite:

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rhyolite

CATEGORY: geology
DEFINITION: An igneous rock that is the volcanic equivalent of granite; a constituent element in Hoabinhian pebble tools.

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bluestone

CATEGORY: geology
DEFINITION: A type of bluish-gray combination of dolerite, rhyolite, and volcanic stone used in the second phase of building Stonehenge. The source seems to be the Preseli Hills of South Wales, 215 km away.

igneous rock

CATEGORY: artifact
DEFINITION: A rock which originated as molten magma from beneath the earth's surface and subsequently came to the surface as an extrusion, or remained below ground as an intrusion. The nature of the rock depends in part on the rate at which it cooled; as intrusions of magma slowly solidify, enough time elapses for large crystals to form whereas extrusions cool quickly, leaving little time for crystal growth. Thus, a coarse-grained, intrusive igneous rock has a fine-grained, extrusive counterpart; granite is coarse rhyolite and gabbro is coarse basalt. Igneous rocks are also classified as acid or basic, according to whether their silica content is high (e.g. granite), or low (e.g. basalt).

Sokchang-ri

SYNONYMS OR RELATED TERMS: [Sokchangni]
CATEGORY: site
DEFINITION: Palaeolithic site in southern Korea (South Ch'ungch'ong province) with 12 cultural layers starting with c 20,000 bp. That layer contained obsidian scrapers, rhyolite burins, and prismatic cores.