• Opal - Wikipedia

    en.wikipedia.org/wiki/Opal 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%. Because of its amorphous character, it is classed as a mineraloid, unlike crystalline forms of silica, which are classed as minerals.
  • Pictures of Opal - Black, Fire, Boulder, Blue and Pink

    geology.com/gemstones/opal Mineralogically, opal is a hydrous silicon dioxide with a chemical composition of SiO 2. nH 2 O. It is amorphous, without a crystalline structure, and without a definite chemical composition (it contains a variable amount of water, as shown by the "n" in its chemical composition). Therefore opal is a " mineraloid " rather than a " mineral."
  • Opal | mineral | Britannica

    www.britannica.com/science/opal Opal, silica mineral extensively used as a gemstone, a submicrocrystalline variety of cristobalite. In ancient times opal was included among the noble gems and was ranked second only to emerald by the Romans. In the Middle Ages it was supposed to be lucky, but in modern times it has been regarded
  • Opal Gemstone | Opal Stone – GIA

    www.gia.edu/opal Because opal has the colors of other gems, the Romans thought it was the most precious and powerful of all. The Bedouins believed that opals contained lightning and fell from the sky during thunderstorms.
  • Opal Stone: Meanings, Properties and Uses - The Complete Guide

    meanings.crystalsandjewelry.com/opal The name Opal is from the Sanskrit upala, which means jewel. There are hundreds of color varieties of this stone, and there are two types of Opal; the Common Opal and the Precious Opal. The Common Opal is characterized by its translucence and its palette of colors that include red, green, blue, and orange.
  • Opal | Etsy

    www.etsy.com/market/opal Opal necklace, opal ball necklace, opal silver necklace, opal jewelry, tiny dot necklace, opal bead necklace, dot necklace, blue opal miniLALI. From shop miniLALI. 5 out of 5 stars (6,240) 6,240 reviews $ 30.00 Bestseller Favorite Add to Natural Ethiopian Opal Gemstone Round 3x3 4x4 5x5 6x6 7x7 8mm Mulit Flashy Handmade Cabochon Calibrated ...
  • October Birthstones | Opal & Tourmaline Birthstone ...

    www.gia.edu/birthstones/october-birthstones Opal Birthstone Meaning & History The name of this, the traditional October birthstone, is believed to have originated in India (the source of the first opals brought to the Western world), where in Sanskrit it was called upala, a “precious stone.".” In ancient Rome, this became opalus.
  • Opal | transportnsw.info

    transportnsw.info/tickets-opal/opal Opal is the smartcard ticketing system used to pay for travel on public transport in Sydney, the Blue Mountains, Central Coast, the Hunter and the Illawarra. Add value before you travel and tap on and off to pay your fare. Use Opal or contactless
  • Get an Opal card | NSW Government | Opal

    www.opal.com.au/en/get-an-opal-card Opal cards can be ordered online for delivery to an Australian address within 5 to 7 business days. Adult and Child/Youth Opal cards are also available over the counter from most retailers, including most convenience stores and newsagents. Concession Opal cards need to be ordered online so your concession eligibility can be confirmed.
  • Manage your Opal card | NSW Government | Opal

    www.opal.com.au/en/about-opal/login Manage your Opal card. If your Opal card is registered, log in to your Opal account if you would like to: Unlink an Opal card from your account; Update your security details such as your password, Opal PIN, security question and answer; View a history of your Opal card orders; Download a PDF activity statement or subscribe for activity ...