Thortveitite
Sc₂Si₂O₇
Silicates
Hardness —
· Monoclinic
Photo: David Hospital · CC BY-SA 4.0
Ferro-gedrite
☐{Fe²⁺₂}{Fe²⁺₃Al₂}(Al₂Si₆O₂₂)(OH)₂
Mg-Fe-Mn-amphibole, double chain inosilicate mineral
Properties
- Chemical formula
- ☐{Fe²⁺₂}{Fe²⁺₃Al₂}(Al₂Si₆O₂₂)(OH)₂
- Group
- Silicates
- Crystal system
- Orthorhombic
- Hardness (Mohs)
- —
- Color
- Gray
- Luster
- —
- Streak
- White
- Density
- —
- Cleavage
- —
- Fracture
- —
- Tenacity
- —
- Crystal habit
- —
- Transparency
- —
- Space group
- Pnma
- Fluorescence
- —
- Magnetism
- —
- Radioactivity
- —
- Refractive index
- —
- Optical character
- —
- Birefringence
- —
- Pleochroism
- —
- Strunz classification
- 9.DE.05
- Dana classification
- —
- IMA status
- Redefined mineral (Rd)
- IMA symbol
- Fged
- Locality
- —
- Type locality
- —
- Discovery year
- —
Etymology
Named after iron(II)
Source: Wikidata
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