Minerals identify

Know how to recognize them

Ettringite

Sulfate mineral

Ettringite is a hydrous calcium sulfate mineral with formula: Ca6Al2(SO4)3(OH)12·26H2O. It is a colorless to yellow mineral crystallizing in the trigonal system. The prismatic crystals are typically colorless, turning white on partial dehydration. It is part of the ettringite-group which includes other sulfates such as thaumasite and bentorite

Identification

Color of mineral

Yellow
White

Mohs scale ( mineral hardness )

2
2.5

Density ( specific gravity )

1.491
1.47

Luster ( interacts light )

Vitreous

Crystal ( diaphaneity )

Trigonal