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Volcanic glass does not technically contain mineral crystals. The definition of a mineral requires a crystalline structure. Secondly, the chemical composition of volcanic glass could vary widely. Minerals have definite parameters for chemical composition.

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Is volcanic glass a mineral?

Volcanic glass is not a mineral. It's composition is complex, and their is no crystalline structure.


Is volcanic glass a mineral group?

No, volcanic glass is not a mineral group. It is a type of igneous rock formed from the rapid cooling of lava without the time for crystallization to occur, resulting in an amorphous (non-crystalline) structure.


What is the hardness of a volcanic rock?

Volcanic rocks can vary in hardness depending on their mineral composition. On the Mohs scale of mineral hardness, most volcanic rocks fall between 5 to 7, with basalt being around 6 and rhyolite around 7.


Extremely rapid cooling lavA in which no crystals form?

the reterded mineral


What minerals make up volcanic glass?

No minerals make up true volcanic glass, as the crystalline structure of minerals did not have time to form before the lava hardened. A mineral must have a crystalline structure.


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.


What mineral can scratch glass has a nonmetallic luster has fracture and is a dark color?

The mineral that fits these descriptions is obsidian. Obsidian is a natural volcanic glass that can scratch glass, has a nonmetallic luster, typically exhibits conchoidal fracture, and is usually a dark color, such as black, dark green, or dark brown.


What is sometimes known as volcanic glass?

Obsidian is a glass of volcanic origin.


Must all rocks form crystals?

All rock does not contain mineral crystals. Obsidian, or volcanic glass, in particular is a rock that has cooled so quickly from lava that mineral crystals were not able to form.


What mineral has a hardness of 5 Mohs scale nad can be scratched by a steel?

apatite, cobalt, zirconium, palladium, tooth enamel, obsidian (volcanic glass)


What type of rock is volcanic glass?

Siliceous volcanic glass is also known as obsidian.


Are the atoms in volcanic glass organized or disorganized?

The atoms in volcanic glass are highly disorganized.