metamorphic
Charoite
Charoite; (K,Sr,Ba,Ca)15-16(Na,Ca)8(Si,Al)24O60(OH,F)4·nH2O
Hardness: 5.0-6.0 on Mohs scale; Color: Bright violet to deep purple with white or black swirls/inclusions; Luster: Vitreous to pearly/silky; Crystal Structure: Monoclinic; Cleavage: Good; Specific Gravity: 2.54-2.58.
- Hardness
- 5
- Luster
- Vitreous to pearly/silky
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Physical properties
Hardness: 5.0-6.0 on Mohs scale; Color: Bright violet to deep purple with white or black swirls/inclusions; Luster: Vitreous to pearly/silky; Crystal Structure: Monoclinic; Cleavage: Good; Specific Gravity: 2.54-2.58.
Formation & geological history
Formed via contact metamorphism through the alteration of limestone by an alkaline syenite intrusion. It is associated with the Murun Massif in the Chara River area, Yakutia, Russia, and is typically dated to the Mesozoic era.
Uses & applications
Primarily used as a lapidary stone for high-end jewelry (cabochons, beads), decorative carvings, and as a sought-after collector's specimen due to its rarity.
Geological facts
It was only officially discovered in 1978. It is renowned for its chatoyancy—a silky, shimmering optical effect created by its fibrous structure. Despite its appearance, the purple color is attributed to manganese impurities.
Field identification & locations
Found exclusively in one location: the Murun Massif in Siberia, Russia. In the field, its distinct 'swirling' lavender pattern and fibrous texture are diagnostic. Look for black Aegirine-augite or orange Tinaksite inclusions to confirm authenticity.
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