Grandidierite
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An exceptionally rare magnesium iron aluminum borosilicate, grandidierite shows a distinctive blue-green to teal color from traces of iron and exhibits strong trichroism in blue, green, and colorless. It was first described in 1902 from southern Madagascar by the mineralogist Alfred Lacroix and named for the explorer Alfred Grandidier, remaining among the scarcest of gem minerals until larger Madagascar deposits appeared in the 2010s. Crystallizing in the orthorhombic system, it measures 7.5 on the Mohs scale, hard enough for jewelry. Transparent faceted grandidierite, a moderately priced semi-precious stone, commands premium prices among collectors for its rarity and striking aqua tone.
Physical & Optical Properties
Category
Semi-Precious Gems
Mohs Hardness
7.5
Specific Gravity
2.85 – 3.0
Refractive Index
1.578 – 1.639
Crystal System
Orthorhombic
Luster
Vitreous
Cleavage
Distinct
Fracture
Uneven
Color
various
Birefringence
0.037
Mohs Hardness
Mohs Hardness: 7.5
1 Soft10 Hard
Crystal System
Value & Market
Price Tier
Moderate ($50-500/ct)
Where to Buy Grandidierite
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.
About Grandidierite
그란디디에라이트는 마그네슘 알루미늄 붕소 규산염 광물로, 청록색에서 청녹색의 아름다운 색채와 강한 삼색성이 특징입니다. 방향에 따라 청색, 녹색, 무색으로 달리 보이는 뚜렷한 삼색성은 보석학적으로 매우 독특합니다. 마다가스카르가 주요 산지이며, 희귀성과 아름다운 색채로 최고급 수집 보석 중 하나로 꼽힙니다.
Jewelry Use
Durability
8/10
Suitable for daily wear
Science FYI Family
Frequently Asked Questions
What is Grandidierite?
그란디디에라이트는 마그네슘 알루미늄 붕소 규산염 광물로, 청록색에서 청녹색의 아름다운 색채와 강한 삼색성이 특징입니다. 방향에 따라 청색, 녹색, 무색으로 달리 보이는 뚜렷한 삼색성은 보석학적으로 매우 독특합니다. 마다가스카르가 주요 산지이며, 희귀성과 아름다운 색채로 최고급 수집 보석 중 하나로 꼽힙니다.
What is the hardness of Grandidierite?
Grandidierite has a Mohs hardness of 7.5, making it excellent for use in jewelry.
What color is Grandidierite?
Grandidierite is primarily Various.
How much does Grandidierite cost?
Grandidierite falls into the Moderate ($50-500/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Grandidierite?
Grandidierite belongs to the Orthorhombic crystal system.