Thortveitite
Sc₂Si₂O₇
Silicates
Hardness —
· Monoclinic
Photo: Robert M. Lavinsky · CC BY-SA 3.0
Pargasite
NaCa₂(Mg₄Al)(Si₆Al₂)O₂₂(OH)₂
Ca-amphibole, double chain inosilicate mineral
Properties
- Chemical formula
- NaCa₂(Mg₄Al)(Si₆Al₂)O₂₂(OH)₂
- Group
- Silicates
- Crystal system
- Monoclinic
- Hardness (Mohs)
- 5,5
- Color
- Green
- Luster
- —
- Streak
- —
- Density
- —
- Cleavage
- —
- Fracture
- —
- Tenacity
- —
- Crystal habit
- —
- Transparency
- —
- Space group
- C2/m
- Fluorescence
- —
- Magnetism
- —
- Radioactivity
- —
- Refractive index
- —
- Optical character
- —
- Birefringence
- —
- Pleochroism
- —
- Strunz classification
- 9.DE.10
- Dana classification
- 66.1.3a.12
- IMA status
- Redefined mineral (Rd)
- IMA symbol
- Prg
- Locality
- —
- Type locality
- —
- Discovery year
- —
Etymology
Named after Pargas
Source: Wikidata
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