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Lake Otero
Good for student examination
The main entrance to the mine appears to have been covered by a rockfall
such as the orange red sand derived from the Navajo Sandstone
A hematite coating gives this quartz sand its color
sparry magnesite - pinolith - hand specimen of a very unusual metamorphic rock from Austria Lake OteroPinolith 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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