What is Sard?
Sard is a variety of chalcedony that is often found in India, Brazil, and Uruguay. It’s primarily used as a gemstone and is popular for its brown to reddish-brown color.
Sard is a unique gemstone that comes in shades of brown to reddish-brown. Its earthy hue and unique appearance make it a popular choice for jewelry and decorative items, especially beads and pendants.
|Chemical Classification||Inorganic - Silicate (Chalcedony)|
|Color||Reddish-brown, varying from deep brown to more translucent reddish hues.|
|Luster||Waxy to vitreous.|
|Occurrence||India, Brazil, and Uruguay.|
|Formation||Typically found in hydrothermal veins and in nodules in volcanic rocks.|
|Diaphaneity||Translucent to opaque|
|Cleavage||Perfect in one direction|
|Mohs Hardness||6.5 to 7|
|Specific Gravity||2.58 - 2.64|
|Diagnostic Properties||Brownish-red chalcedony.|
|Pleochroism||Not observed in sard.|
|Crystal System||Hexagonal (variety of Quartz)|
|Optical Properties||Uniaxial (+)|
|Refractive Index||1.530 - 1.539|
|2V angle||Not applicable (isometric)|
|Dispersion||Not typically noted for its dispersion.|