Minerals identify

Know how to recognize them

Roselite

Arsenate mineral

Roselite is a rare arsenate mineral with chemical formula: Ca2(Co,Mg)2·H2O. It was first described in 1825 for an occurrence in the Rappold mines of Schneeberg , Germany after German mineralogist Gustav Rose It occurs in cobalt environments and was associated with veins and chalcedony It has also been reported from Italy , British Columbia

The pleochroism of roselite depends on chemical composition with darker rose colored varieties being higher in cobalt content and lighter rose colored varieties are higher in calcium content (Palache et al., 1960). This gives rise to two different pleochroism schemes, one for dark rose and one for light rose. Dark rose varieties have X: dark rose, Y: pale rose, Z: paler rose. Light rose varieties have X: pale rose, Y: paler rose, Z: palest rose.

Identification

Color of mineral

Red
Pink

Mohs scale ( mineral hardness )

3.5

The streak

Red

Density ( specific gravity )

1.725
1.728
1.735

Luster ( interacts light )

Vitreous

Crystal ( diaphaneity )

Monoclinic