Mineral crystals grow under a variety of conditions. Slow cooling of magma (melted rock) deep within the Earth generally leads to a rock such as granite with visible crystals of feldspar, quartz, mica, amphibole and other minerals.
The world's largest Opal Matrix has just been found in the opal fields of South Australia. The stone which is a whoppingly unbelievable carats in size is currently in Australia and was found by noted designer Stuart Hughes and his associates.
Ruby in Zoisite Locality: Longido, Arusha, Tanzania Description: Superb hexagonal ruby crystal, the red-pink gem variety of the mineral species corundum, in green zoisite matrix. The ruby crystal has exceptionally rich color and runs comple