Celestite

Hardness 3-3.5 on Mohs scale, pale blue color, vitreous to pearly luster, orthorhombic crystal system, perfect cleavage.

Forms primarily in sedimentary environments within evaporite deposits, limestone cavities, and hydrothermal veins.

Used as a primary source of strontium for fireworks and ceramics, and valued heavily as a collector mineral specimen.

Named from the Latin word caelestis meaning celestial, referring to its occasional sky-blue heavenly color. Madagascar produces some of the finest crystal clusters globally.

Identified easily by its soft nature, distinct pale blue color, and heavy weight relative to its size. Common in Madagascar, Ohio, and Poland.