Rhyolite: R1811
Item
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Title
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Rhyolite: R1811
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Description
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This rock has an overall greyish white color. The matrix is muddy and dull, and it feels somehow gritty in hands. The crystals of the sample are small and vitreous, some of them are colorless and some of them are black. The identifiable minerals are quartz, biotite and muscovite. Rhyolite is an igneous, volcanic, very felsic rock, because it is usually formed in a late crystallization period, when the percentage of Si is pretty high in the magma, because other elements have been moved away through crystallization.
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Creator
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8585
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Type
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Igneous rock
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Mediator
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Tamara Carley
