Opal is a hydrated amorphous form of silica (SiO 2 · n H 2 O); its water content may range from 3% to 21% by weight, but is usually between 6% and 10%. Due to the amorphous (chemical) physical structure, it is classified as a mineraloid, unlike crystalline forms of silica, which are considered minerals.

2024年1月3日 · Opal is a fascinating mineral known for its unique play of colors and diversity. There are many types of opal, each with distinct characteristics that make them special. For example, boulder opal, hyalite, and fire opal are all unique forms of this mineral.

Opal is an October birthstone. Grids of silica spheres 0.2 microns in size create red play-of-color flashes. Opal contains up to 20% water trapped in its silica structure. The novel “ Anne of Geierstein ” gave opal a reputation of being unlucky.

2023年3月22日 · Witness the kaleidoscope of colors within the world of opals! A close-up look at 10 distinct opal types, accompanied by vivid images that reveal their intricate patterns and mesmerizing hues.

For thousands of years, people have mined and treasured opals. These striking stones are the traditional October birthstone and have inspired a rich body of folklore. (So rich, in fact, opal gems have been considered both the luckiest and unluckiest stones you can wear).

2021年8月11日 · Opal gemstones are hydrated silica crystals that form over millions of years. Learn about opal details, including stone meanings and symbolism, history, pricing, and value.

Discover where to find opal in Texas and the regions known for these colorful gems. Explore the best spots for rockhounds!

This Opal (Common) gemstone guide lists qualities of the Opal (Common) gem type, including stone colors, common names, meanings, gemstone hardness and more.

1. Find a jeweler who carries a wide variety of opal. Commercial-quality white opal is affordable and available in almost any jewelry store. But before you decide what kind of opal you’d like to own, be sure to see some high quality unusual opals with dramatic play-of-color too.

Opals are unique gemstones formed from hydrated silicon dioxide, giving them their characteristic play-of-color. Scientists have studied their composition and physical properties to gain valuable insights into these fascinating gems. Opals are made up of closely packed spheres that diffract light, creating vibrant colors.