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where calcium-rich spring water meets carbonate-rich lake water to precipitate calcium carbonate
iridescent angular basalt sand from the top of a lava flow at Kalapana
leading to the formation of lens-shaped orebodies of magnesite
the greenish sand is composed of grains of olivine that weather out of the basalt of an old cinder cone
aragonite - "cave calcite" - El Potosi Mine, Santa Eulalia Mining District, Chihuahua - hand/display specimen where calcium-rich spring water meetsaragonite 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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