What is Chalcedony?
Chalcedony is a form of silica, composed of very fine intergrowths of quartz and moganite. It’s found in various parts of the world including Brazil, Turkey, and the United States. Chalcedony comes in a variety of colors and is often used as a gemstone.
Chalcedony is a versatile gemstone that comes in a range of colors including blue, pink, and green. Its unique appearance and color make it a popular choice for jewelry and decorative items, especially beads and pendants.
|Chemical Classification||Inorganic - Silicate (Chalcedony)|
|Color||Chalcedony comes in a variety of colors, including blue, green, pink, red, and yellow, but it's most commonly found in bluish-white or gray shades.|
|Luster||Waxy to vitreous.|
|Transparency||Opaque to translucent.|
|Occurrence||India, Brazil, and Madagascar.|
|Formation||Chalcedony forms in a variety of geological settings, from cavities in volcanic rocks to sedimentary formations.|
|Cleavage||Perfect in one direction|
|Mohs Hardness||6.5 to 7.|
|Diagnostic Properties||Waxy luster, various colors.|
|Crystal System||Hexagonal (variety of Quartz)|
|Optical Properties||Uniaxial (+)|
|Refractive Index||1.530 - 1.539|
|2V angle||Measured: 58°|
|Dispersion||Not notably high.|