description Benitoite Overview
Benitoite is a rare blue barium titanium cyclosilicate mineral that was first discovered in 1907 in San Benito County, California. It crystallizes in a rare hexagonal crystal system, typically forming distinct, triangular, sapphire-blue gemstones that exhibit strong dichroism. Designated as the official state gemstone of California in 1985, gem-quality benitoite is found almost exclusively in the California Coast Ranges. It is highly sought after by mineral collectors and gemologists due to its rarity, high dispersion rate, and unique geographic origin.
insights Ranking position
Benitoite ranks #35 of 200 in the Gemstone ranking, behind Opal, ahead of Color Change Garnet.
help Benitoite FAQ
Where is gem-quality benitoite found?
The classic gem material comes from San Benito County, California, particularly the Benitoite Gem Mine district. Benitoite has been reported elsewhere, but transparent crystals suitable for faceting remain strongly associated with this California locality.
Why do benitoite crystals have a triangular shape?
Benitoite belongs to the trigonal crystal system and commonly develops distinctive triangular or tabular crystals. That unusual geometry helped make the mineral recognizable to collectors and contributed to its scientific importance.
Does benitoite glow under ultraviolet light?
Many California benitoite specimens fluoresce vivid blue under shortwave ultraviolet light. The surrounding natrolite matrix can make this response particularly dramatic when a specimen is viewed in darkness.
Why is benitoite California's state gemstone?
California designated benitoite as its official state gemstone in 1985. The choice reflects both its rarity and its close association with San Benito County, from which the mineral received its name.
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