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how is obsidian dependent on minerals

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What minerals are formed in Krakatoa?

Krakatoa is known for forming a variety of minerals, including pumice, obsidian, and sulfur. These minerals are a result of the volcanic activity that occurs in the region.


Is obsidian heavy or light?

Obsidian is considered to be relatively heavy due to its density compared to other types of rock. Its weight is attributed to its composition, which includes various minerals and volcanic glass.


What specific type of rock can NOT be formed from minerals?

There are a couple examples. Coal is a rock, but it is organic and so does not contain minerals. Obsidian and pumice are both varieties of volcanic glass. Since they lack a crystal structure, they are not composed of minerals


What minerals are obsidian made up of?

There are no minerals in obsidian. Obsidian is a silica-rich volcanic glass, which cools too quickly to produce crystals. A mineral must have an ordered atomic structure and a distinct chemical composition. The size of a crystal depends on cooling rate of the magma: slower cooling correlates to larger crystal size. If a magma cools too quickly, the elements don't have time to organize themselves into crystals, and will "freeze" in place as a glass. Obsidian often has a chemical composition similar to a granite, meaning that the ratios of different elements and oxides would be the same. The major difference between these two rocks is cooling rate--granite cools slowly, deep underground, while obsidian cools quickly on the surface.


Is pumice and obsidian exaples of minerals?

Pumice is not a mineral; it is a type of volcanic rock with a frothy texture. Obsidian, on the other hand, is a naturally occurring volcanic glass and is considered a mineraloid rather than a true mineral because it lacks a crystalline structure.