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 | Reference mineral | Grandidierite |
|---|---|---|
| 1 | Talc | |
| 2 | Gypsum | |
| 3 | Calcite | |
| 4 | Fluorite | |
| 5 | Apatite | |
| 6 | Orthoclase | |
| 7 | Quartz | |
| 8 | Topaz | |
| 9 | Corundum | |
| 10 | Diamond |
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
格兰迪迪石是一种极为稀有的镁铝硼硅酸盐矿物，以其独特的蓝绿色著称，颜色介于绿色和蓝色之间。这种矿物具有显著的三色性，从不同角度观察可呈现出蓝绿色、白色和深绿色三种颜色。格兰迪迪石最初发现于马达加斯加，以法国探险家阿尔弗雷德·格兰迪迪耶命名，是世界上最稀有的宝石之一，顶级刻面标本价值不菲。
On this page
Jewelry Use
Durability
8/10
Suitable for daily wear
Science FYI Family
Frequently Asked Questions
What is Grandidierite?
格兰迪迪石是一种极为稀有的镁铝硼硅酸盐矿物，以其独特的蓝绿色著称，颜色介于绿色和蓝色之间。这种矿物具有显著的三色性，从不同角度观察可呈现出蓝绿色、白色和深绿色三种颜色。格兰迪迪石最初发现于马达加斯加，以法国探险家阿尔弗雷德·格兰迪迪耶命名，是世界上最稀有的宝石之一，顶级刻面标本价值不菲。
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.