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Dacite is the volcanic equivalent of granodiorite and can be thought of as a quartz rich andesite
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such as the orange red sand derived from the Navajo Sandstone
Aragonite-based scleractinian corals replaced the calcite-based tabulate reef building corals during the Permo-Triassic extinction event roughly 252 million years ago
sparry magnesite - pinolith - hand specimen of a very unusual metamorphic rock from Austria There will be a linkPinolith is an unusual metamorphic rock, sometimes called pinolite, and is a form of sparry magnesite. The gray matrix is anhydrous talc, as revealed by recent infrared fluorescence spectroscopy and is not graphite rich dolomitic limestone as formerly thought. The white pine nut shaped crystals are magnesite magnesium carbonate, MgCO3. Near Sunk, Hohentauern, Austria, millions of tons of magnesite have been mined in the 1800s and 1900s for the
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