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This medium-grained sandstone is composed primarily of quartz with feldspar and some biotite
Its crystals can grow as fine fibrils that are considered asbestiform
Quartz is identified by its hardness
Sand is derived from whatever materials are locally available
sand - dune sand - fine-grained yellow-brown dune sand derived from a sandstone member of the Menefee Formation in New Mexico - set of two 2-ounce jars This medium-grained sandstone is composedThe Allison Member of the Upper Cretaceous Menefee Formation is a cliff forming yellow brown sandstone. As it weathers, sand grains picked up by the wind form local small dunes north of Crownpoint, New Mexico. The grains in these dunes are very fine, similar in size to the grains in the pink dune sand that is derived from the Jurassic Navajo Sandstone in Utah. It would be instructive for students to compare these two dune sands both fine grained but
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