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Precious stones are found either in crystallized or amorphous conditions. The forms of crystallization are:
1 Isometric or Cubic; having the axes equal 2 Tetragonal or Pyramidal 3 Hexagonal or Rhombohedral having only the lateral axes equal 4 Orthorhombic or Trimetric 5 Monoclinic or Oblique 6 Triclinic or Anorthic having the axes unequal
Most precious stones crystallize, but the specimens that have the crystallization clearly defined are seldom found. The amorphous condition includes the turquois, opal, and obsidian, which minerals are found in masses or veins surrounded by a matrix. |
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Precious Stones Guide Vol 1
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