Opals

Opal is a non-crystalline solid which is not really a mineral but is actually a mineraloid. It is often used as an accessory for jewelry because of its translucent characteristics. About 97% of the world’s opals are produced in Australia.

1,071 Questions
Birthstones
Opals

What color is opal birthstone?

The Opal is October, it's a white kind of color.

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Opals

Do opals shrink?

No they do not shrink.

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Jewelry
Pokemon Diamond Pearl and Platinum
Rosetta Stone - Artifact
Opals

If I have a gold tone bracelet and what looks like siver encasing five clear stones and an x and then more stones x more stones until there is 6 sets of stones isit worth anything?

That depends; is it real gold, gold plate, gold filled, brass, silver plate, platinum... are the stones diamonds, glass, CZ????

Nobody can possibly tell you without examining the piece.

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Jewelry
Earth Sciences
Australia
Gems and Precious Stones
Opals

What is the hardness of opal?

Opal is ranked between 5.5 and 6.5 on the Mohs scale.

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Clothing
Sewing
Women's Clothing
Opals

What yarn is best for sewing bathing suits?

The thread that should be used is 80# polycore spun. This is obtained in 1000 - 2000- 5000m cones. It is a bit expensive but is cholrine colour fast and very tough.

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Environmental Issues
Gems and Precious Stones
Opals

Why is opal a non-renewable resource?

Opals take millions of years to become what they are today. So we say its not renewable

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Australia
Gems and Precious Stones
Opals

Where are opals mined in Queensland?

Opals in Queensland are mined at Yowah, just outside of Quilpie in the far west of the state.

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United States of America
Opals
United States

In what states of the US are opals found?

Pa

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Australia
Gems and Precious Stones
Opals

What is opal wanted for?

If the opal has fire, play of color, it is used for jewelry. Very little gem quality opal is imported by the USA. Most of it goes to Asia. The white opal you are used to seeing in the stores is not considered gem quality in the trade. Gem quality opal can cost thousands of dollars a carat.

Opal can be man made. It is produced for research to see if it can be more efficient in transmitting light than optic cable.

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Gems and Precious Stones
Opals

Where can opal be found?

Nearly all opals come from the mines in Australia. Other countries where opals are mined include Mexico, Brazil and the United States. A few have been found in parts of Africa.

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Geology
Jewelry
Birthstones
Garnets
Opals

Why is garnet opal and topaz considered to be gemstones?

cz all 3 are made from mixtures as well as shine and differ from just normal rocks

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Jewelry
Names and Name Meanings
Opals

What does the name opal mean?

Opal is the Australian natural gemstone and is formed from a solution of silicon dioxide and water, it ranges in colors from clear to white, gray, red, orange, yellow, green, blue, magenta, rose, pink, slate, olive, brown, and black. However, it is brittle, heat sensitive, and breaks and scratches easily.

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Opals

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 .

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Geology
Jewelry
Gems and Precious Stones
Opals

Is Opal precious or semi precious?

Some opal is considered a precious stone, but not particularly rare. The colored gems tend to be brittle.

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Opals

What city and state is known as the opal capital of the world?

Coober Pedy in South Australia for Opal rough.

Hong Kong for loose stones and jewellery wholesale.

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Australia
South Australia
Opals

In which country is the town of Coober Pedy?

Coober Pedy is a town in northern South Australia, 846 km north of Adelaide. So: the correct answer is that Coober Pedy is in the country of Australia, specifically the state of South Australia.

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Geology
Jewelry
Opals

Is crystal a gemstone?

Rock crystal (white) is a variety of a quartz (gemstone). Crystal may also refer to man-made glass in general sense. Some of the other variety of quartz are Amethyst (violet), Citrine (yellow to golden), Smoky quartz (brown to gray), Rose quartz (pink), etc.

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Science
Geology
Gems and Precious Stones
Opals

Why is the mineral opal referred to as a mineraloid?

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Geology
Australia
Gems and Precious Stones
Opals

What is the luster of opal?

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Gems and Precious Stones
Opals

How are opals made?

Opal is formed from a solution of silicon dioxide and water. As water runs down through the earth, it picks up silica from sandstone, and carries this silica-rich solution into cracks and voids , caused by natural faults or decomposing fossils. As the water evaporates, it leaves behind a silica deposit.95% of the world’s opals are found in Australia, with the rest found in Brazil, Mexico, Honduras and the western US.
Source: http://www.opalsdownunder.com.au/learn-about-opals/advanced/how-opal-formed-geology-opal

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Geology
Gems and Precious Stones
Opals

What mineral group is opal in?

Opals are not truly minerals (because they don't have a crystalline structure), they are in a class called mineraloid. A mineraloid is an amophous, inorganics substance that lacks a crystalline structure, but are mineral in nature. You will find that in many older reference systems, they may well be classed as minerals.

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Geology
Australia
Gems and Precious Stones
Opals

What is the streak of opal?

Streak is a mineralogical term to describe the colour produced by rubbing a piece of mineral against a (porcelain) neutral background.

Since Opal is made from silica spheres, I'd expect a white streak, but meaningless. There may be powdered spheres left behind from the opal structure.

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Geology
The Difference Between
Opals

What is a mineraloid?

A mineraloid is a mineral like substance that does not dumonstate crystallinity

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Gems and Precious Stones
Opals

What does the color opal look like?

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.

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Austria
Opals

Does Austria have fire opals?

No, I belive you are thinking about Australia. Australia is a country known for their opals. Austria is a country in eastern Europe, Australia is a country in the Pacific close to Asia.

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