·H2O) — metamorphic](https://media.rockidentification.com/264470f7-626c-4d63-8ec7-06dfd149ced4-compressed.jpg)
metamorphic
Charoite
Charoite (Hydrated silicate of potassium, sodium, calcium, barium and strontium): (K,Sr,Ba)(Na,Ca)2[Si4O10](OH,f)·H2O
Hardness: 5-6 (Mohs); Color: Violet, lilac, or lavender with swirls of white, black, or orange; Luster: Vitreous to pearly/silky; Crystal Structure: Monoclinic (fibrous habit); Cleavage: Distinct in three directions; Specific Gravity: 2.54–2.58.
- Hardness
- 5-6 (Mohs)
- Luster
- Vitreous to pearly/silky
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Physical properties
Hardness: 5-6 (Mohs); Color: Violet, lilac, or lavender with swirls of white, black, or orange; Luster: Vitreous to pearly/silky; Crystal Structure: Monoclinic (fibrous habit); Cleavage: Distinct in three directions; Specific Gravity: 2.54–2.58.
Formation & geological history
Formed through contact metamorphism where an alkali syenite intrusion entered limestone deposits. This unique geological event occurred roughly 115 to 145 million years ago during the Cretaceous period.
Uses & applications
Primarily used as a semi-precious gemstone for jewelry (cabochons, beads), ornamental carvings, and high-end lapidary work. It is highly valued as a 'collector's stone' due to its rarity.
Geological facts
Charoite was first discovered in the 1940s but remained unknown to the western world until 1978. It is named after the Chara River in Russia. It is one of the few minerals that is so visually distinct it is almost impossible to confuse with anything else.
Field identification & locations
Identify in the field by its unique swirling, 'chatoyant' violet patterns and fibrous texture. It is found in only one location in the world: the Murun Massif in the Sakha Republic (Siberia), Russia. Collectors should look for intense purple saturation and chatoyancy.
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