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Puka Lava stone belongs to one classify of basalt which is formed by when ejected magma condensate, digenetic and compaction.
Black lava stone is very precious through the eruption of a porous shaped stone formation. After decreased rapidly by gas residue, solid magma and temperature pressure, caused chemical and physical changes. so the magma becomes natural puka lava stone which contains amounts of silicon, Potassium, Sodium, Iron, Magnesium and other 26 kinds of minerals as well copper, Zinc, Chromium and Nickel, Manganese, etc.
