Siliceous volcanic glass is also known as obsidian.
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Amorphous siliceous(silica contain)hard parts mostly found in
radiolaria and heliozoa.
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biogenous
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Calcareous ooze is composed of calcium carbonate, while
siliceous ooze is made from silicon oxide.
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The rock tripoli is considered a siliceous limestone, as most of
the calcium carbonate has been weathered out or baked out by
proximity to a plutonic intrusion.