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・ Planation surface
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Plancheite
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Plancheite : ウィキペディア英語版
Plancheite

Plancheite is a hydrated copper silicate mineral with the formula Cu8Si8O22(OH)4•(H2O). It is closely related to shattuckite in structure and appearance, and the two minerals are often confused.
==Structure==
Plancheite is a chain silicate (inosilicate), with double chains of silica tetrahedra parallel to the c crystal axis.〔 It occurs as sprays of acicular or fibrous radial clusters, with fibers extended parallel to the chains, i.e. along the c crystal axis;〔 it can also form tiny tabular or platy crystals. It is a member of the orthorhombic crystal class m m m (2/m 2/m 2/m), which is the most symmetrical class in the orthorhombic system.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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