66 KG /  3 lbs 10 ounces

and violet

Dimensions:  46x40x21 mm / 1

Product Type: Kyanite

black Biotite crystal book from the Calcite Vein-Dikes of the Grenville Geological Province Ontario

Hourglass Selenite Crystal | Gypsum Crystal | Oklahoma USA Chalcophanite 66 KG / 3 lbsThese are cabinet sized Hourglass Selenite Crystals from Salt Plains, Oklahoma. Oklahoma designated the unique hourglass selenite crystal as the official state crystal in 2005 after elementary school students from Bryant and Red Oak School petitioned the state legislature. Hourglass selenite crystals are found only on the salt plains of Oklahoma, a unique 11,000 acre geological area. The salt plains were formed by repeated flooding by sea water