Chambersite

Formula:  Mn₃B₇O₁₃Cl

Origin of name:  Locality; Chambers Co., Texas

Crystal system:  Orthorhombic

Crystal class:  mm2

Twinning:

Unit cell: a = 8.68 Ǻ, b = 8.68 Ǻ, c = 12.26 Ǻ

Colour:  Colourless, to deep purple

Diaphaneity:

Luster:  Vitreous

Habit:  Crystals subhedral to euhedral

Hardness:  7

Specific gravity:  3.49

Cleavage:  None

Tenacity:  Subconchoidal to uneven

Streak:

Synonyms/varieties:

Comments: