Thortveitite
Sc₂Si₂O₇
Silicates
Hardness —
· Monoclinic
Photo: Wikimedia Commons
Tounkite
(Na,Ca,K)₈(Al₆Si₆O₂₄)(SO₄)₂Cl·0.5H₂O
Tectosilicate mineral
Properties
- Chemical formula
- (Na,Ca,K)₈(Al₆Si₆O₂₄)(SO₄)₂Cl·0.5H₂O
- Group
- Silicates
- Crystal system
- Hexagonal
- Hardness (Mohs)
- —
- Color
- —
- Luster
- —
- Streak
- —
- Density
- —
- Cleavage
- —
- Fracture
- —
- Tenacity
- —
- Crystal habit
- —
- Transparency
- —
- Space group
- P6₂22
- Fluorescence
- —
- Magnetism
- —
- Radioactivity
- —
- Refractive index
- —
- Optical character
- —
- Birefringence
- —
- Pleochroism
- —
- Strunz classification
- 9.FB.05
- Dana classification
- 76.2.5.14
- IMA status
- Approved mineral and/or valid name (A)
- IMA symbol
- Tou
- Locality
- 🇷🇺 minerals of Slyudyanka
- Type locality
- —
- Discovery year
- —
Etymology
Named after Tunka valley
Source: Wikidata
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