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Its a rock. Just a shiny one.
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∙ 12y ago
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Is an opal a type of rock?
No, it's a type of silica, and is classed as a mineraloid.
Is a opal a sedimentary rock?
yes
Is Fire Opal a rock or a mineral?
Neither. Opal is a mineraloid, as it does not have a sufficiently organized structure to be considered a mineral.
Is an opal a rock?
No, it's actually a form of silica.
Is opal a sedimentary igneous or metamorphic rock?
igneous
Valuable rock start with o four letter word?
opal
How does opal fit in the rock cycle?
Opal is amorphous mineraloid, occurrence : Sedimentary and secondary from the alteration of high silica igneous extrusive rocks
Is peridot a type of opal?
No. Peridot is olivine.
What type of crystal structure does the opal have?
Opal doesn't have a crystal shape, it's amorphous.
What type of rock is green opal?
An opal is considered to be a mineraloid, meaning that it has all of the properties of a mineral-- solid, inorganic, naturally forming, has a chemical composition-- but does not demonstrate crystallinity. Other examples of mineraloids include obsidian, an amorphous glass (that is not a crystal).
Are there different kinds of opal?
The types of Opal that i am familiar with are White Opal, Fire Opal, Boulder Opal, Black Opal, Crystal Opal, Light Opal, Doublet Opal, Triplet Opal, Common Opal, Synthetic Opal, and Immitation Opal.
Is opal an intrusive or extrusive mineral?
Opal is not considered a rock but actually a mineraloid gel. It is deposited at relatively low temperatures. One of the characteristics if igneous rocks, sometimes called fire rocks, is that they are formed at high temperatures. Whether an igneous rock forms below ground, or on or near the surface, it's all about heat forming the rock. Opal cannot take its form under that kind of heat.
