Strontianite Composition, Crystallization & Structure

Composition. Strontium carbonate, SrCO₃ = Carbon dioxide 29.9 strontia 70.1. A little calcium sometimes present,

Crystallization. Orthorhombic. Crystals usually acicular like type (1) under aragonite. Twinning also frequent, giving at times pseudohexagonal forms.

Structure. Radiating crystallized, also columnar; fibrous and granular.

Physical Properties. H. = 3.5-4 G. = 3.7. vitreous luster. White gray, yellow , green. Transparent to translucent.

Tests Infusible. On intense ignition throws out fine branches and gives a crimson flame (strontium) and residue gives alkaline reaction on moistened test paper. Effervescence in hydrochloric acid and the mediumly dilute solution will give precipitate of strontium sulphate on addition of a few drops of sulfuric acid; no precipitate will form in the very dilute solution (difference from calcium and barium). Usually necessary to make the above tests to determine the mineral.

Occurrence. A comparatively rate mineral found in veins in limestones or marls, and less frequently in eruptive rocks. Sometimes in metallic veins. Originally found at Strontian in Argyllshire. In commercial deposits in Westphalia; at Schoharie, New York, etc.

Use. Has no great commercial use. A minor source of strontium compounds used in fireworks and in the separation of sugar from molasses.

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