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Both break with a sharp-edged fracture
mineral dealers cook selenite roses with a weed burner to drive off the water
The magnesite is calcined or burned with charcoal at temperatures above 900˚C to form magnesium oxide used in the chemical industry and in the heat resistant refractory bricks used in steel making to protect furnace walls and ladles from hot liquid steel
Geode slices from Brazil are also altered by dying them in unnatural shades of red or blue
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sand - gypsum sand from Lake Lucero - set of two 2-ounce jars Both break with a sharp-edgedThis is the sand that forms the dunes at White Sands National Monument. It forms as gypsum crystals on the surface of Lake Lucero as it evaporates in the summer. Blown by the wind, the crystals break down and are transported into the White Sands dune field to the east. One dune, shown in the field photo, has escaped the National Monument and is encroaching on US Highway 70. That's where this sand was collected. The gypsum was deposited on the sea
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