- Types:
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agglomerate
volcanic rock consisting of large fragments fused together
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amygdaloid
volcanic rock in which rounded cavities formed by expanding gas have subsequently become filled with mineral deposits
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dacite
a grey volcanic rock containing plagioclase and quartz and other crystalline minerals
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basalt
the commonest type of solidified lava; a dense dark grey fine-grained igneous rock that is composed chiefly of plagioclase feldspar and pyroxene
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volcanic glass
a kind of natural glass produced when molten lava cools very rapidly
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lava
rock that in its molten form (as magma) issues from volcanos; lava is what magma is called when it reaches the surface
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tufa, tuff
hard volcanic rock composed of compacted volcanic ash
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obsidian
acid or granitic glass formed by the rapid cooling of lava without crystallization; usually dark, but transparent in thin pieces
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pitchstone
dark acid granitic glass
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tachylite
a basic or basalt glass
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aa
a dry form of lava resembling clinkers
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pahoehoe
freely flowing lava
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pillow lava
lava that hardened in rounded shapes suggestive of pillows; believed to result from underwater eruptions
