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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).
Wiki User
∙ 15y ago
Wiki User
∙ 11y agoIt is a mineral-like substance called a mineraloid which differs from a mineral in that its molecules are not arranged in any particular order. If this is for school, I would suggest putting it down as a mineral but adding my answer in as a side note.
Wiki User
∙ 13y agoOpal is a mineraloid gel which is deposited at a relatively low temperature and may occur in the fissures of almost any kind of rock
Wiki User
∙ 14y agoan opal
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Where can you find opals?
Opal is mined mainly in the country of Australia. It is also found in Nevada in the United States. You can also find opal at a Natural History Museum or a Rock Shop in your area, a good chance to study a variety in person. The Natural History Museum in Cleveland has an amazing collection. At a rock shop you can touch and feel the opal, so much better than browsing on the internet, which is a good source for information. One of the best rock shops is ROCK STAR CRYSTALS in Manhattan in NYC. They have a large variety of opals to look at, including fire opals, pink and blue andean opal, australian opals, ethiopian opals, honey opal, green opal, and even opal jewelry. Might be worth a visit to NYC just to check them out - and you can be awed by the mineral collection at the NYC Museum of Natural History at the same time!
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
What type of crystal structure does the opal have?
Opal doesn't have a crystal shape, it's amorphous.
What color is opal birthstone?
Opal is a stone that is a clearish whitish background, with different colors scattered around on it. There are colors such as red, orange, blue, green, ect. These colors appear more than once on the stone.
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 a type of rock?
Its a rock. Just a shiny one.
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
What type of punk is green day?
Punk Rock.
What is the rarest gemstone in the world?
Some colored diamonds are extremely rare. Red and green diamonds are most rare.alexandrite is really really rareBlack Opal
Where can you find opals?
Opal is mined mainly in the country of Australia. It is also found in Nevada in the United States. You can also find opal at a Natural History Museum or a Rock Shop in your area, a good chance to study a variety in person. The Natural History Museum in Cleveland has an amazing collection. At a rock shop you can touch and feel the opal, so much better than browsing on the internet, which is a good source for information. One of the best rock shops is ROCK STAR CRYSTALS in Manhattan in NYC. They have a large variety of opals to look at, including fire opals, pink and blue andean opal, australian opals, ethiopian opals, honey opal, green opal, and even opal jewelry. Might be worth a visit to NYC just to check them out - and you can be awed by the mineral collection at the NYC Museum of Natural History at the same time!
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
What type of rock is green grey in pacific northwest?
Serpentinite is one of the "green" rocks of the Pacific northwest.
