What is Grandidierite?
Grandidierite is a rare mineral that is often found in Madagascar and Sri Lanka. It’s primarily used as a gemstone and is popular for its bluish-green to greenish-blue color. Due to its rarity, it’s considered one of the most valuable gemstones.
Grandidierite is an extremely rare and valuable gemstone that comes in shades of bluish-green to greenish-blue. Its unique appearance and color make it a popular choice for high-end jewelry and collectors’ items.
|Chemical Classification||Inorganic - Borosilicate|
|Color||Primarily blue-green, with intense color being the most valuable.|
|Transparency||Typically transparent to translucent.|
|Occurrence||Madagascar is the primary source. Other sources are not well-documented due to its rarity.|
|Formation||Grandidierite is found in pegmatites and boron-rich metamorphic rocks.|
|Specific Gravity||Approximately 2.85 - 2.98.|
|Diagnostic Properties||Translucent blue-green.|
|Pleochroism||Strong; blue, green, and colorless.|
|Optical Properties||Biaxial (+)|
|Refractive Index||1.590 - 1.623|
|Birefringence||0.009 - 0.010|
|2V angle||Measured: 85° to 90°|
|Dispersion||Not typically noted due to its color and transparency.|