strontianite

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strontianite Carbonate mineral, strontium carbonate (SrCO3). It has an orthorhombic system, massive or columnar aggregates, or hexagonal twinned crystals. It can be pale green, white, grey, yellow, or brown. It is found in veins, often in limestone. Hardness 3.5–4; r.d. 3.7.

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