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This medium-grained sandstone is composed primarily of quartz with feldspar and some biotite
they are classified as a mineraloid
the 'Gypsum' cave
and is frequently found in schists that formed at medium to high pressures and lower temperatures in areas of regional metamorphism
including from this mine
fulgurite - set of natural glass tubes formed by lightning strikes on sand This medium-grained sandstone is composedFulgurites form when a lightning bolt strikes the earths surface, fusing the material into a glass tube, sometimes with a hollow center. When lightning strikes sandy soil, the air and moisture in the sand are rapidly heated. Quartz sand melts at a temperature of roughly 1600C to 2000C depending on the moisture content. The name comes from the Latin fulgur, for lightning. These were collected from a Sahara dune field in Morocco. Though the seller did
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