sample rhyolite silicic volcanic rock stone isolated white background |
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| navigate by keyword : sample rhyolite silicic volcanic rock stone geologist39aph39s paving stones attach rail sleepers extrusive igneous high silica pink gray color grains small difficult observe used isolated mineral white coal geology black nature macro crystal carbon close fuel gold texture natural charcoal pyrite raw precious ore object shiny background hand |
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| Rhyolite is an extrusive igneous rock with a very high silica content. It is usually pink or gray in color with grains so small that they are difficult to observe without a hand lens. The paving stones are used to attach the rail to the rail sleepers. |
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