Amphiboles (silicates): Bustamite
Diagnostic card.
(Mn, Ca) 3 Si 3 O 9
Triclinic syngene
Hardness 5,5-6,5
Specific weight 3,3-3,4
Cleavage is perfect
Color pinkish
Color in powder white
Glitter from glass to pearly
Bustamite crystallizes in the form of radiant-fibrous aggregates of pinkish color, sometimes slightly brownish due to secondary changes. Glitter of mineral glass. Radial-radiant and fibrous aggregates, less often large prismatic crystals and solid crystalline masses.
It is established from optical absorption spectra that the pink color of bootistite is associated with Mn2 + in octahedral coordination, while brown occurs when Mn2 + bands are superimposed on strong background absorption. The gloss on the cleavage plane is glassy, in the fracture it is greasy. Translucent, sometimes transparent. Some samples in ultraviolet rays luminesce with a bright red color.
Calcium fortified bustamite contains abundant plates of clinopyroxene, the axis of which is parallel to the axis b of bustamite. Despite the absence in nature of a complete series of intermediate minerals between wollastonite and bustamite, at a high temperature, there appears to be a continuous solid solution with a disordered cation distribution. Theor. Composition: CaO6 - 29.97, MnO6 - 37.91, SiO2 - 32.12 (with Ca: Mn = 1: 1). Due to the mutual replacement of Ca and Mn, this ratio can deviate significantly from the theoretical one. In addition, CaO6- and MbO6-octahedra can be populated with Mg, Fe and, to a lesser extent, Zn (MgO - up to 1.90%, FeO - up to 8.63%).
Diagnostic signs.
Partially decomposed by hydrochloric acid. Easily melts in the flame of a candle.
Origin.
Occurs in some limestones on contacts and, mainly, in manganese deposits of metasomatic genesis.
Place of Birth.
Bustamit is known in Franklin-Førnes in New Jersey (USA), Longban in Sweden, in the Ochori mine in Japan and in Broken Hill in Australia.
Bustamite. Broken Hill, New. South. Wales, Australia. Photo: © А.А. Evseev.
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