Tumchaite

Tumchaite, Na₂(Zr,Sn)Si₄O₁₁•H₂O, is a colorless to white monoclinic phyllosilicate mineral. It is associated with calcite, dolomite, and pyrite in the late dolomite-calcite carbonatites. It can be transparent to translucent; has a vitreous luster; and has perfect cleavage on {100}. Its hardness is 4.5, between fluorite and apatite. Tumchaite is isotypic with penkvilksite. The structure of the mineral is identified by silicate sheets parallel {100}, formed by alternation of clockwise and counterclockwise growing spiral chains of corner-sharing SiO₄ tetrahedra. Tumchaite is named for the river Tumcha near Vuoriyarvi massif.

单词	Tumchaite
释义	Tumchaite 英语百科 Tumchaite Tumchaite, Na₂(Zr,Sn)Si₄O₁₁•H₂O, is a colorless to white monoclinic phyllosilicate mineral. It is associated with calcite, dolomite, and pyrite in the late dolomite-calcite carbonatites. It can be transparent to translucent; has a vitreous luster; and has perfect cleavage on {100}. Its hardness is 4.5, between fluorite and apatite. Tumchaite is isotypic with penkvilksite. The structure of the mineral is identified by silicate sheets parallel {100}, formed by alternation of clockwise and counterclockwise growing spiral chains of corner-sharing SiO₄ tetrahedra. Tumchaite is named for the river Tumcha near Vuoriyarvi massif.
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