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Colemanite - Ca₂B₆O₁₁ x 5(H₂O)

Classification: Borate
Atomic numbers: 20, 5, 0 & 2
Atomic weight: 396.4
Melting point (C): cca. 1200
Boiling point (C):
Density (g/cm3): 2.42
Hardness (Mosh-scratch): 4-4.5
Crystal structure: Monoclinic-normal: (110) prism
Color (solid): Clear/whitish
Cleavage: b-pinacoidal: (010)