Benitoite

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Found in gem quality almost exclusively at a single deposit, the Benitoite Gem Mine in San Benito County, California, benitoite is a barium titanium silicate of exceptional rarity. It shows a sapphire-blue color, a dispersion that rivals diamond, and an intense white fluorescence under short-wave ultraviolet light. Crystallizing in the hexagonal system, it measures 6.0 to 6.5 on the Mohs scale, hard enough for careful jewelry use but valued chiefly by collectors. California designated it the state gemstone in 1985, and the near-monopoly of its source, together with its beauty, places this moderately priced semi-precious stone among the rarest and most sought-after collector gems.

Physical & Optical Properties

Category Semi-Precious Gems

Mohs Hardness 6.0 – 6.5

Specific Gravity 3.61 – 3.68

Refractive Index 1.757 – 1.804

Crystal System Hexagonal

Luster Adamantine,Subadamantine,Vitreous

Cleavage Indistinct

Fracture Conchoidal

Color various

Birefringence 0.047

Dispersion 0.039

Pleochroism Strong dichroism: blue - colorless

Mohs Hardness

Mohs Hardness: 6.0 – 6.5

1 Soft10 Hard

Crystal System

Value & Market

Price Tier Moderate ($50-500/ct)

Where to Buy Benitoite

Blue Nile Fine jewelry retailer

James Allen Gemstone jewelry

Brilliant Earth Ethically sourced gems

Amazon Wide selection

Links may earn a commission at no extra cost to you.

Treatments

6 to 6.5Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references 3.61 to 3.68Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references BrittleWalter Schumann, Gemstones of the world (2001) IndistinctWalter Schumann, Gemstones of the world (2001) More from other references ConchoidalArthur Thomas, Gemstones (2009) 1.757 to 1.804Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references Uniaxial/+Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references 0.047Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) DoublingMore from other references Strong dichroism: blue - colorlessHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references 0.039 to 0.046Michael O?Donoghue, Gems, Sixth Edition (2006) More from other references Blue, purple, pink, colourlessWalter Schumann, Gemstones of the world (2001) More from other references Blue, Fe2+-O-Ti4+ charge transferW. William Hanneman, Pragmatic Spectroscopy For Gemologists (2011) Transparent,TranslucentArthur Thomas, Gemstones (2009) Adamantine,Subadamantine,VitreousWalter Schumann, Gemstones of the world (2001) More from other references Weak to bright chalky blue.Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references InertHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references HexagonalHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references TabularMichael O?Donoghue, Gems, Sixth Edition (2006) More from other references In natrolite veins cutting glaucophane schist in a serpentine body (San Benito Co., California, USA); in a magnesio-riebeckite-quartz phlogopite-albite dike cutting serpentinite (Ohmi, Japan).Anthony et al, Handbook of Mineralogy (2001) Benitoite information at mindat.org USA  NJMMh, 16 (1987) / Wise, W.S & Gill, R.H. (1977): Minerals of the Benitoite Gem mine. Mineralogical Record 8, 442-452

About Benitoite

베니토아이트는 바륨-티타늄 규산염 광물로, 미국 캘리포니아 주 산베니토 카운티에서만 보석 품질의 결정이 발견되어 캘리포니아 주의 공식 보석으로 지정되었습니다. 자외선(단파장) 아래에서 강렬한 파란색 형광을 발하는 것으로 유명하며, 높은 분산도와 아름다운 청색으로 수집가와 보석 애호가들에게 최고의 보석 중 하나로 꼽힙니다.