![]() Rare species include green montane greed, a transparent aquamarine obsidian of a greenish hue and a dark purple strombolite. One of the most beautiful varieties with a pearl shade was discovered in Armenia. Sometimes there is a multi-colored version: bluish-blue, red, green or rainbow. Obsidian, full of the smallest gas and liquid impregnations, gives a golden or silver effect. The second name of this striped species is mountain mahogany. Characterized by alternating red and black colors. A variety of black obsidian is the rounded discharge. The trade name in the US is a mountain diver or a black Nevada diamond. He is also called a peacock's tail or a midnight lace. The color range is especially beautiful on the cut. It shows clearly distinguishable layers of blue, red, green hues. On a common black or dark brown background, there are slightly blurred white spots resembling snowflakes. ![]() The composition of the rapidly frozen lava and the conditions for the formation of volcanic glass affect the color of the material: Diorite - is formed on the basis of feldspar crystals, reminiscent of granite.Porphyry - a bright red variety of andesite.Gabro - contains impregnations with grains of pyroxene.Rhyolite - its composition resembles granite. ![]() The composition of obsidian is divided into five main types:
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