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Azurite is a soft mineral, with a hardness of 3.5 to 4 on the Mohs scale. It is also somewhat chemically unstable, and prone to gradual loss of the intensity of its deep blue color in heat, bright light or open air. For this reason it is not so often fashioned into gemstones. It ...
The feldspar minerals in K2 have a hardness of about 6 on the Mohs scale and will be scratched or show signs of wear over time if subjected to abrasion or impact. K2 is therefore not a good stone for mounting in a ring or bracelet. K2 attracts a lot of attention at gem and mineral...