answersLogoWhite

0

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.

334 Questions

Does the opal smell?

Opals are a type of mineral composed of silica and water, so they do not have a distinct smell. The smell of a material is typically due to volatile compounds that are released into the air, which opals do not contain. Therefore, if you encounter an opal that has a smell, it may have been exposed to other substances that are imparting an odor onto it.

What is the streak of a opal?

The streak of an opal is typically colorless due to its amorphous structure. It doesn't leave a visible streak on a streak plate like some other minerals do.

What is a opals grain size?

Opal's grain size refers to the size of the silica spheres that make up the gemstone. Larger grain sizes can enhance the play of colors in opals, while smaller grain sizes may result in a more uniform color appearance. Grains in opal are typically between 150 and 300 nanometers in size.

How much are opals?

The price of opals can vary widely depending on factors such as size, quality, and color. Prices can range from a few dollars for lower quality opals to several thousand dollars for high-quality, rare opals. It's best to research specific types of opals and shop around to find the best price.

Do opal shatter?

Yes, opal can be fragile and prone to cracking or shattering if mishandled or exposed to sudden changes in temperature or pressure. It is important to handle opal jewelry and stones with care to prevent damage.

What is the texture of an opal?

Opals typically have a smooth or waxy texture on the surface due to their composition of silica spheres. The internal structure of opals can exhibit a unique play of colors called opalescence.

How big do opals stones get?

Opal stones can range in size from a few millimeters to several centimeters in diameter. The largest opal ever found was known as the Olympic Australis, which weighed around 17,000 carats (3.4 kg) and measured about 30 cm in length.

How is opal ware made?

Opalware is made from a blend of glass and a mineral called fluorite. The mixture is heated and molded into the desired shapes, and then cooled to give it its characteristic opalescent appearance. Once cooled, the opalware is often glazed to enhance its durability and create a smooth finish.

What are facts about opal?

Opal is a precious gemstone that can display a unique play of colors due to its internal structure. It is composed of silica and water, and its colors can vary depending on the angles of observation. Opal is the birthstone for October and is often associated with luck, love, and creativity.

When looking at an opal you will see many different colors what causes this phenomenon?

The array of colors seen in opals is caused by diffraction and interference of light within microscopic silica spheres in the gemstone. The size and arrangement of these spheres influence the specific colors visible, giving opals their characteristic play of color.

What is the tenacity of opal?

The tenacity of opal is relatively low compared to other gemstones. It is prone to scratching, chipping, and cracking due to its composition, which includes water. It should be handled with care to avoid damage.

Is opal valuable?

Ther is no set answer to this question. Each opal is unique and has its own value. From colorless opal to the most prized fire opal it depends on the size and color. A good place to get the idea of the value of opal is to go to ebay and type in opals. You will see prices from a few dollars to over 50,000 dollars.

What is the difference between an Australian opal and an Ethiopian opal?

Australian opals are known for their vibrant play-of-color, while Ethiopian opals typically exhibit a more honey-like coloration with flashes of red, orange, and green. Ethiopian opals are also generally more translucent than Australian opals.

Where does about 95 of the worlds opal the mineral come from?

About 95% of the world's opal comes from Australia, particularly from the regions of New South Wales, Queensland, and South Australia. These areas are known for producing high-quality opals with vibrant colors and unique patterns.

Is an opal a type of rock?

Opals are classified as mineraloids, not rocks. They are made up of silica and water, with a unique internal structure that diffracts light to display a play of colors.

Are opals made from volcanoes?

Opals are not made from volcanoes. Opals are formed from a combination of silica-rich water and heat over long periods of time. They are typically found in the cracks and cavities of sedimentary rocks, not in volcanic environments.

What is the Texture of an Opal Mineral?

Opal is an amorphous mineral, which means it lacks a true crystal structure. It typically exhibits a smooth, glassy texture. Opal can also display a unique play-of-color caused by the diffraction of light, giving it a vibrant and iridescent appearance.

What is a myth for the gem opal?

One myth about opals is that they bring bad luck to those who wear them if it's not their birthstone. This superstition likely arose due to the gem's colorful and shifting hues, which were misunderstood as signs of bad omens.