https://www.edulete.in/question/what-is-the-mineral-gaudefroyite-s-chemical-formula

posted Sep '22 by sinjarite

Sinjarite ; Brilliance: Glassy, Resinous ; Hardness: 1½ ; Explicit Gravity: 1.66 ; Precious stone Framework: Tetragonal ; Name: Named after the Sinjar Watercourse, Iraq, its revelation ...
Gem Framework: Tetragonal
Equation: CaCl2 · 2H2O

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