Richterite
Real mineral · rare · Na(CaNa)(Mg,Fe++)₅[Si₈O₂₂](OH)₂
A sodium calcium amphibole of metamorphosed limestone and manganese deposits, running from brown to a deep translucent blue when potassium takes a place in the structure.
Identity
- Formula
- Na(CaNa)(Mg,Fe++)₅[Si₈O₂₂](OH)₂
- Chemical class
- silicate
- Mineral group
- Actinolite, Hornblende, Tremolite
Crystallography
- Crystal system
- monoclinic
- Habits
- prismatic, fibrous, bladed
- Fracture
- uneven
Physical properties
- Mohs hardness
- 6
- Density
- 3.09 g/cm³
- Luster
- vitreous
- Colors
- blue, brown, brown red, gray violet, yellow
- Streak
- white
- Transparency
- transparent, translucent
Geology
- Origins
- metamorphic, hydrothermal
- Host rocks
- marble, skarn
- Associated minerals
- Calcite, Tremolite, Diopside
- Geography
- Sweden, USA, India
Classification
- Rarity
- rare
- Gem quality
- No
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