plancheite
Sign in to savePlancheite 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.
Key facts
- Mineral.name
- Plancheite
- Mineral.category
- Inosilicate
- Mineral.image
- Plancheite and Malachite.jpg
- Mineral.caption
- Plancheite and Malachite, Milpillas mine, Sonora, Mexico
- Mineral.imagesize
- 300px
- Mineral.formula
- Cu8Si8O22(OH)4•(H2O)
- Mineral.IMAsymbol
- Pch
- Mineral.molweight
- 1,171 g/mol
- Mineral.strunz
- 9.DB.35 (10 ed) 8/F.05-10 (8 ed)
- Mineral.dana
- 66.2.1.1
- Mineral.system
- Orthorhombic
- Mineral.class
- Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m)
- Mineral.symmetry
- Orthorhombic Space group: Pcnb
- Mineral.color
- Pale blue, light blue, dark green
- Mineral.habit
- Acicular, Fibrous, or Radial
- Mineral.cleavage
- None observed
- Mineral.mohs
- 5.5 to 6
- Mineral.luster
- Vitreous to silky
via Wikipedia infobox
Article
5 sectionsContents
- Structure
- Properties
- Environment
- References
- External links
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.