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Obsidian is part of the Granite family of igneous rocks.
obsidian obsidian
because an obsidian rock has low silica
Obsidian is black glass formed by volcanoes.
Igneous rocks
Obsidian
obsidian
Vinegar, which is acidic, reacts with the calcite or limestone present in sedimentary rocks, resulting in the release of carbon dioxide gas. The fizzing or bubbling you observe is the visible evidence of this reaction. This reaction between the acid and the calcium carbonate in the rock is similar to the reaction that occurs when acid is added to baking soda.
Obsidian and coal are both rocks and they are formed by lava
Obsidian is formed from very rapidly cooling lava.
No. Pumice and obsidian are rocks composed mostly of glass.
obsidian rocks are red and black also sometimes orange