How is opal mined

Australianopaldirect04 Oct, 2022Other

Opal stone has been a mystery for centuries. No two opals look the same. The word "opal" was derived from the Greek word opallos, meaning "to see changes in color." Opal is derived as a rare gemstone that is formed from non-crystalline silica gel. It is composed of 6 to 10 percent water, and small spheres of silica are arranged in a regular pattern. It generally measures 5.5 to 6.5 on the MOH hardness scale with diamonds measuring 9 to 10 and pearls 4 to 5. It is the stone for October.