metamorphic
Charoite
Charoite (K(Ca,Na)2Si4O10(OH,F)·H2O)
Hardness: 5-6 on Mohs scale; Color: Intense violet, lavender, to deep purple with swirling patterns; Luster: Vitreous to pearly/silky; Crystal Structure: Monoclinic; Cleavage: Three directions; Specific Gravity: 2.54-2.58.
- Hardness
- 5-6 on Mohs scale
- Luster
- Vitreous to pearly/silky
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Physical properties
Hardness: 5-6 on Mohs scale; Color: Intense violet, lavender, to deep purple with swirling patterns; Luster: Vitreous to pearly/silky; Crystal Structure: Monoclinic; Cleavage: Three directions; Specific Gravity: 2.54-2.58.
Formation & geological history
Formed via contact metamorphism of limestone by the intrusion of alkali syenite. It occurs where a potassic magma altered local limestone deposits. Found only in the Chara River area of the Sakha Republic, Siberia, Russia.
Uses & applications
Primarily used as an ornamental stone, for lapidary work, cabochons for jewelry, and as a popular specimen for mineral collectors.
Geological facts
Charoite was first discovered in the 1940s but was not known to the outside world until its description in 1978. Its name is derived from the Chara River. It is often described as 'unnatural' looking due to its vivid purple swirls.
Field identification & locations
Identify by its unique swirling, fibrous 'chatoyant' appearance and distinct violet color. It is found exclusively in one location globally (The Murun Massif in Siberia). It often contains inclusions of orange Tinaksite or black Aegirine.
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