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When they have just been mined they come in all sorts of shapes and sizes but once they have been polished and cut, they are usually round and smooth.

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15y ago

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What is the form of Opal?

Opal has no definitive form. The word used to describe opal is "amorphous" which means: lacking definite form - having no specific shape.


Why opal water and mercury are not true minerals?

Minerals by definition are solid, naturally occurring inorganic materials with a definite shape and crystalline structure. Opal water and mercury are both liquids lacking a definite shape and crystalline structre.


What is the most common shape of opal?

Opals are generally elliptical in shape, are in some cases pear or spherical. Angular shapes for opals are not commonly seen.


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.


How many types of opals are there?

There are 5 basic types of opal. These types are Peruvian Opal, Fire Opal, Girasol Opal, Common opal and Precious Opal.


What type of crystal structure does the opal have?

Opal has an amorphous or non-crystalline structure, meaning it lacks a repeating atomic arrangement like that found in crystals. Instead, opal is made up of tiny silica spheres arranged in a disordered pattern, which gives it its beautiful color play known as "play-of-color."


What is another name for opal?

Another name for opal is "fire opal."


What is the fracture of opal?

The fracture of an opal can be hard or smooth , An opal can have as many fractures as any other mineral can . Sometimes opal can be smooth , sometimes they can be hard . The fracture of an opal is hard and smooth .


Who are the main character in because of winn dixie?

India Opal Buloni (Opal) The Preacher (Opal's father) Winn-Dixie (Opal's dog)


What is boulder opal?

Boulder opal is distinct from black opal in the following ways: * Boulder opal is usually mined in open-cut operations while black opal is mined in shafts. * Boulder opal is found in ironstone boulders, while black opal is found in seams.


What are the ingredience in black opal?

black and opal


Does opal scratch easily?

depens on the opal