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In the field photo
the greenish sand is composed of grains of olivine that weather out of the basalt of an old cinder cone
leading to the formation of lens-shaped orebodies of magnesite
with time and increased temperature
forming a layer cake of silty sediment and peat
aragonite - "cave calcite" - El Potosi Mine, Santa Eulalia Mining District, Chihuahua - hand/display specimen In the field photoaragonite CaCo3 Aragonite is a pseudomorph of calcite, with the same chemical formula, calcium carbonate, but a different crystal structure. When carbonated groundwater contains calcium, it most commonly precipitates calcite when cold and aragonite, when hot. Sometimes called "cave calcite," this aragonite comes from the Potosi Mine in the Santa Eulalia Mining District, Chihuahua, Mexico. The silver, lead, zinc and copper ores in this mine are
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