What is Opal?
Opal is a hydrated amorphous form of silica that is known for its stunning play-of-color. It’s primarily found in Australia, but it can also be sourced from other countries including Ethiopia and Mexico. Opal is often used as a gemstone and is a popular choice for jewelry due to its beautiful colors and spiritual significance.
Opal is a colorful gemstone known for its unique play-of-color. Its wide range of colors and intricate patterns make it a popular choice for jewelry and decorative items. The stone is often used in rings, necklaces, and pendants, and is sometimes used to make beads.
|Chemical Classification||Inorganic - Silicate (Hydrated silica)|
|Color||Opals can be colorless, white, gray, red, orange, yellow, green, blue, magenta, rose, pink, slate, olive, or brown. The play-of-color can display a wide range of hues.|
|Streak||White to Light Blue|
|Luster||Subvitreous to waxy.|
|Transparency||Translucent to opaque.|
|Occurrence||Australia, Ethiopia, and Mexico.|
|Formation||Typically found in sedimentary rocks, but can also be found in volcanic rocks.|
|Diaphaneity||Translucent to opaque with play-of-color|
|Specific Gravity||Approximately 1.98 to 2.25.|
|Optical Properties||Isotropic (due to its amorphous nature)|
|Refractive Index||1.440 - 1.460|
|Birefringence||None (isotropic due to amorphous nature)|
|2V angle||Not applicable (amorphous)|
|Dispersion||Not typically relevant for opals due to their play-of-color.|