Kröhnkite

Sulfate mineral

Kröhnkite ( Na2Cu(SO4)2•2H2O) is a rare copper sulfate mineral Kröhnkite may be replaced by Saranchinaite, the anhydrous form of the mineral, if heated to temperatures above 200 °C (392 °F)

Identification

Color of mineral

Blue

Green

Yellow

Mohs scale ( mineral hardness )

2.5

Density ( specific gravity )

1.544

1.578

1.601

Luster ( interacts light )

Vitreous

Crystal ( diaphaneity )

Monoclinic