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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.
Wiki User
∙ 14y ago
Wiki User
∙ 13y agoObsidian is a volcanic glass, so the main component is silica. It is 70-75% SiO2,
plus MgO, Fe3O4.
Wiki User
∙ 12y agoNone, Obsidian cooled down so quickly that no minerals had time to form.
Wiki User
∙ 11y agoIt is a mineral.
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How is obsidian dependent to minerals?
how is obsidian dependent on minerals
Is pumice and obsidian exaples of minerals?
No. Pumice and obsidian are rocks composed mostly of glass.
Is a stone made of atoms?
All rock, with few exceptions (like obsidian), is made up of minerals.
What rocks made of?
Rocks which are made of minerals can be made up of many minerals and they can also be made up of only one mineral. Generally rocks are made of two or more minerals
What kind of mineral is a rock?
Rocks are made up of minerals, so a certain type of rock will have several different types of minerals in it. Minerals are what rocks are made up of! It depends on what kind of rock you're wondering about to know which minerals its made up of.
How is obsidian dependent to minerals?
how is obsidian dependent on minerals
What minerals make up a obsidian?
salt, silca, and grain
What are the minerals in obsidian?
Obsidian is, itself, a mineral.
What minerals are obsidian made off?
The formula incudes Silicon, Oxygen, Magnesium and Iron.
What minerals does obsidian have?
none
Does an obsidian rock have minerals you can see with magnification?
No, obsidian is volcanic glass.
What does obsidian mean in rocks and minerals?
Obsidian is black glass formed by volcanoes.
Is pumice and obsidian exaples of minerals?
No. Pumice and obsidian are rocks composed mostly of glass.
How was the rock obsidian made?
Obsidian is a volcanic or igneous rock. It is formed when lava dries up.
Is a stone made of atoms?
All rock, with few exceptions (like obsidian), is made up of minerals.
Does obsidian have any minerals present?
No, it is a colloidal glass.
What minerals is the obsidian rock made of?
Obsidian is a volcanic glass, so the main component is silica. It is 70-75% SiO2, plus MgO, Fe3O4. Mainly from molten granite, carbonated basalt and quartz for shininess.
