What is Painite?
Painite is a rare calcium zirconium borate, once famous as one of the rarest minerals and now a high-value collector and gem material.
Mineralogy and crystal structure
Reference formula: CaZrBAl9O18. Painite is trigonal and chemically complex. Authenticity, treatment, origin and laboratory confirmation matter because many marketed stones are not painite. Painite is classified with borates and has a trigonal crystal system. Typical hardness is 8–8.5 on the Mohs scale and specific gravity is approximately 4.0–4.1.
Colour, lustre and habit
Typical colours include brown, red-brown, orange, pink. The usual prismatic, tabular, granular habit and vitreous lustre help describe a specimen, but colour alone is not diagnostic.
Formation and notable localities
Painite forms in or is associated with boron-rich metamorphic rocks, marble and gem-bearing alluvial deposits. Important documented localities include Myanmar, especially Mogok, with authenticated material in major gem collections.
Rarity with a warm red-brown colour
Painite's commercial story is inseparable from verification. A documented crystal or faceted stone carries both an unusual borate structure and a remarkable history of scarcity.
Collecting and care
Use a laboratory report for valuable material; protect from impact and heat and keep provenance with the stone.
