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
グランジディエライトは、マグネシウムアルミニウムホウ珪酸塩鉱物で、青緑色の非常に稀少な宝石です。マダガスカルが主要産地で、宝石質の透明な標本は極めて稀です。強い多色性を持ち、見る角度によって青・緑・無色に変化します。宝石コレクターが最も求める稀少石のひとつです。
On this page
Jewelry Use
Durability
8/10
Suitable for daily wear
Science FYI Family
Frequently Asked Questions
What is Grandidierite?
グランジディエライトは、マグネシウムアルミニウムホウ珪酸塩鉱物で、青緑色の非常に稀少な宝石です。マダガスカルが主要産地で、宝石質の透明な標本は極めて稀です。強い多色性を持ち、見る角度によって青・緑・無色に変化します。宝石コレクターが最も求める稀少石のひとつです。
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.