![]() Obsidians have various physical & visual properties, such as Hardness, Grain Size, Fracture, Streak (Colors), Porosity, Luster, and Strength. The point where magma cools due to airborne cooling effects.The point where magma comes into contact with water on the surface.Along the edges of a sill or dike, which takes place under the surface and it is the only intrusive type.Along the edges of a dome of the volcano.Along the edges of a flow of magma or lava.Obsidian rock can form in a variety of cooling environments such as. It forms on the surface of the earth when magma or lava comes out due to volcanic phenomena and rapid cooling takes place. We have seen in the earlier section that obsidian is a type of extrusive rock. Alternate Names : Lava, Glassy Lava, Xaga, Royal Agate, Glass Agate, Volcanic Glass, Glass Gem, Guardian Gem, and Black Beauty.Class : Igneous Rocks Sub-Class : Medium Hardness Rocks.Let’s see the classification of obsidian rocks from the perspective of a geologist. Geological Classification of Obsidian Rocks: It has a smooth and uniform texture, which breaks with a conchoidal fracture. The cooling of lava takes place so rapidly that no chance remains for proper crystallization (Atomic Arrangements) and finds as an amorphous glass material. It forms when felsic lava extruded from a volcano onto the surface of the earth. ![]() Obsidian is a glassy igneous rock that comes in a wide range of colours and textures. When molten magma is cooling rapidly onto the surface of the earth and forms small crystals in the rocks, they are known as extrusive igneous rocks. When molten lava/magma is cooling slowly below the surface of the earth and forms large crystals in the rocks, they are known as intrusive igneous rocks. ![]() We know igneous rocks have two basic types: 1. ![]() Today, we are going to know Obsidian rock, which falls in the main class of igneous rocks. In the Limestone article, we learned how sedimentation occurs and the formation of sedimentary rocks takes place. We know three main classes of rocks, sedimentary, igneous, and metamorphic. ![]()
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