• igneous origin associated with groundwater (Intrusive igneous rocks) caused by the pressure. Of magma under the earth but can not push it up to the surface. Making the magma cools slowly. And the crystallization of minerals within the rock gems such as Labrador Wright (Labradorite), and sometimes a liquid or solution. Some of the mass magma is intruded cut into the rock side and cooling make up vein as late SPC's tight (Pegmatite) gems in this manner,
such as tourmaline (Tourmaline) Beryl (Beryl)
, feldspar (Feldspar. ) topaz (Topaz)
Morakot (Emerald)
or a wireless hot mineral water. (Hydrothermal vein) gems in this manner include
quartz (Quartz) type, such as Amethyst (Amethyst).
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