Thortveitite
Sc₂Si₂O₇
Silicates
Hardness —
· Monoclinic
Photo: Wikimedia Commons · CC BY 2.0
Muscovite
KAl₂(Si₃Al)O₁₀(OH)₂
True mica, phyllosilicate mineral; polytypes: 1M, 2A, 2M2, 3T
Properties
- Chemical formula
- KAl₂(Si₃Al)O₁₀(OH)₂
- Group
- Silicates
- Crystal system
- Monoclinic
- Hardness (Mohs)
- —
- Color
- White
- Luster
- —
- Streak
- White
- Density
- —
- Cleavage
- —
- Fracture
- —
- Tenacity
- —
- Crystal habit
- —
- Transparency
- —
- Space group
- —
- Fluorescence
- —
- Magnetism
- —
- Radioactivity
- —
- Refractive index
- —
- Optical character
- —
- Birefringence
- —
- Pleochroism
- —
- Strunz classification
- 9.EC.15
- Dana classification
- 71.2.2a.1
- IMA status
- Approved mineral and/or valid name (A)
- IMA symbol
- Ms
- Locality
- 🇬🇧 Llandybie
- Type locality
- —
- Discovery year
- —
Etymology
Named after Grand Principality of Moscow
Source: Wikidata
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