Celestite Cluster | Madagascar Sand it has a Mohs hardness

it has a Mohs hardness of about 5

and calcite

5" x 2" and weighs 8

Under ultraviolet illumination the mineral sodalite will fluoresce

occurs when a second generation of fluorite crystallizes over an existing

Celestite Cluster | Madagascar Sand it has a Mohs hardnessThis celestite cluster comes from Madagascar and features translucent blue to blue gray crystals naturally formed on a light colored matrix. Celestite, also known as celestine, is a strontium sulfate mineral with the chemical formula SrSO and crystallizes in the orthorhombic system. The crystals often form in sharp, well defined shapes with a glassy luster, making celestite a favorite among mineral collectors. With a Mohs hardness of 33. 5, celestite