Mexican Cantera Opal Cabochon - Jalisco, Mexico demantoid Primarily composed of hydrated calcium

Primarily composed of hydrated calcium silicate

This sphere has been expertly carved and finished to a smooth

Size: 9cm x 5cm x 2

Belonging to the chlorite mineral group

Mexican Cantera Opal Cabochon - Jalisco, Mexico demantoid Primarily composed of hydrated calciumIve always been fascinated by how certain minerals look when they are left partially embedded in their host rock, and this Mexican Cantera Opal Cabochon is a perfect example of that natural contrast. In Spanish, "Cantera" translates to quarry or stone, which refers to the pinkish tan rhyolite matrix that surrounds the precious opal. Instead of being cut out as a traditional gemstone, these specimens are shaped and polished so that the opal sits like a