Minerals identify

Know how to recognize them

Hilgardite

Tektoborates

Hilgardite is a borate mineral with the chemical formula Ca2B5O9Cl·H2O. It is transparent and has vitreous. It is colorless to light pink with a white streak. It is rated 5 on the Mohs Scale. It crystallizes in the triclinic crystal system. Crystals occur as distorted tabular triangles and are hemimorphic, polytypes

It was named for geologist Eugene W. Hilgard (1833–1916). It was first described in 1937 for an occurrence in the Choctaw Salt Dome of Iberville Parish It occurs as an uncommon accessory mineral in evaporite worldwide. In addition to the type locality it has been reported in Wayne County, Mississippi and in the Louann Salt Formation, Clarke County, Alabama in the United States and at the Penobsquis and Salt Springs evaporites, near Sussex, New Brunswick , Canada. In Europe it is reported from the Konigshall-Hindenburg potash, Germany and in the Boulby potash mine, Whitby , Yorkshire, England. In Asia it is reported from the Chelkar salt dome, Uralsk district, Kazakhstan; the Ilga Basin, eastern Siberia, Dead Sea

Identification

Color of mineral

Pink
Red
Brown

Mohs scale ( mineral hardness )

5

Density ( specific gravity )

1.63
1.636
1.664

Luster ( interacts light )

Vitreous

Crystal ( diaphaneity )

Triclinic