Why don t crystals form in obsidian and can all rocks is transformed from one type to another?
Rk Naresh
Obsidian breaks into curved shapes called conchoidal fractures. This happens because it is a glass, which means no mineral crystals formed when it hardened. Rocks that have really small minerals in them can break like this too, but they are not as shiny and smooth as real volcanic glass. All rocks, in fact, change slowly from one type to another, again and again. The changes form a cycle, called "the rock cycle." The way rocks change depends on various processes that are always taking place on and under the earth's surface.
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