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Igneous :fire: (Tuff (Extrusive igneous rocks, light, porous rock formed…
Igneous :fire:
Tuff
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light, porous rock formed by consolidation of volcanic ash.
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Granite
Granite is a common type of felsic intrusive igneous rock that is granular and phaneritic in texture. Granites can be predominantly white, pink, or gray in color
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a very hard, granular, crystalline, igneous rock consisting mainly of quartz
Obsidian
Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock. Obsidian is produced when felsic lava extruded from a volcano cools rapidly with minimal crystal growth.
a hard, dark, glass-like volcanic rock formed by the rapid solidification of lava without crystallization.
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Pumice
Pumice, called pumicite in its powdered or dust form, is a volcanic rock that consists of highly vesicular rough textured volcanic glass, which may or may not contain crystals.
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a very light and porous volcanic rock formed when a gas-rich froth of glassy lava solidifies rapidly.
Basalt
a dark fine-grained volcanic rock that sometimes displays a columnar structure, typically composed largely of plagioclase with pyroxene and olivine.
Basalt is a common extrusive igneous rock formed from the rapid cooling of basaltic lava exposed at or very near the surface of a planet or moon.
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