مولایت
Sign in to saveMullite or porcelainite is a rare silicate mineral formed during contact metamorphism of clay minerals. It can form two stoichiometric forms: 3Al2O32SiO2 or 2Al2O3 SiO2. Unusually, mullite has no charge-balancing cations present. As a result, there are three different aluminium sites: two distorted tetrahedral and one octahedral.
Key facts
- Mineral.name
- Mullite
- Mineral.category
- Nesosilicate
- Mineral.image
- Osumilite, thick tabulars with Mullite - Ochtendung, Eifel, Germany.jpg
- Mineral.imagesize
- 260px
- Mineral.caption
- White, filamentous mullite in front of thicker osumilite platelets(Photo width 1.5 mm)Found in Wannenköpfe, Ochtendung, Eifel, Germany
- Mineral.formula
- Al6Si2O13
- Mineral.IMAsymbol
- Mul
- Mineral.strunz
- 9.AF.20
- Mineral.system
- Orthorhombic
- Mineral.class
- Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m)
- Mineral.symmetry
- Pbnm, Pnnm
- Mineral.unit cell
- a = 7.5785(6) Å, b = 7.6817(7) Å, c = 2.8864(3) Å; Z = 1
- Mineral.color
- Colorless to pale pink or grey
- Mineral.habit
- Prismatic to acicular crystals
- Mineral.cleavage
- Good on [010]
- Mineral.opticalprop
- Biaxial (+)
- Mineral.refractive
- nα = 1.642–1.653 nβ = 1.644–1.655 nγ = 1.654–1.679
- Mineral.birefringence
- δ = 0.012–0.026
via Wikipedia infobox
Wikidata facts
- Subclass of
- nesosilicates
- Named after
- Isle of Mull
- Image
- Mullite-655833.jpg
Show 9 more facts
- Nickel-Strunz '10th ed', review of (9th ed/ 2009 update)
- 9.AF.20
- Commons category
- Mullite
- Nickel-Strunz 9th edition (updated 2009)
- 9.AF.20
- type locality (geology)
- Isle of Mull
- streak color
- white
- crystal system
- orthorhombic crystal system
- IMA Mineral Symbol
- Mul
- chemical formula
- 3Al₂O₃·2SiO₂
- Strunz 8th edition (series ID, updated)
- VIII/A’.02 – Anhang
Sources (3)
via Wikidata · CC0
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