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Strontianite (SrCO3) D02248      Crystal system orthorhombic. Habit needle-like crystals that symmetrically taper to a point.. Cleavage good prismatic cleavage. Fracture none. Hardness 3.5 - 4 Specific Gravity 3.7 Color colorless, white, pink, gray or green. Luster transparent to translucent with a glassy luster. Streak none. Distinguishing features often resembles celestine but unlike celestine, strontianite effervesces with warm HCl acid. Uses an ore for strontium, fireworks (red/purple flame when heated).

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