) is caused by the magma (Magma) cools and crystallizes slowly become igneous mineral crystals with large cooling within the earth's crust Called igneous rocks or igneous groundwater (Plutonic or Intrusive Rocks) such as rock gabbo (Gabbro)
Granite (Granite) etc.
pumice (Pumice) look like Styria, but the pore is small, the weight light มีน้ float or also called "floating rock" Or "rock orange" the abrasive material is found along the coast
Obsidian (Obsidian) caused by magma rising hardens in the earth's crust There are many silica additives with high viscosity The lava hardens quickly Mineral crystal, so no time crystallization. Looks like meat glass. Compared with the glass materialSuch as the spear
Granite (Granite) caused by the cooling of the magma slowly has deep large solid bodies sparkle with many kinds of precious metals ore mineral is found With a coarse granite stone gave birth to mineral3 types, including mineral quartz, feldspar and mica in the pink granite found feld spar ore type orthoclase
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