Origin of name: For George W. Brindley (1905-1983), English-American mineralogist, Professor of Mineral Science, Pennsylvania State University, University Park, Pennsylvania, U.S.A.
Crystal system: Monoclinic and hexagonal
Crystal class: Unknown
Unit cell: a = 5.286 Å, b = 9.133 Å, c = 7.31 Å, b = 104.15° , -1A assumed: a = 5.277 Å, b = n.d., c = 7.09 Å, b = n.d.
Colour: Dark yellowish-green
Habit: Crystals, platy; massive
Hardness: 2.5 to 3
Specific gravity: 3.17
Comments: 2 polytypes assumed -1M and 3A, member of the serpentine group. Found as coatings on limestone an as veinlets cutting kaolinite clays at the base of bauxite deposit developed on karst, also a significant component of weathered ultramafic rocks
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