Opal Opal is a hydrated amorphous form of silica (SiO2·''n''H2O); its water content may range from 3 to 21% by weight, but is usually between 6 and 10%. Due to its amorphous property, it is classified as a mineraloid, unlike crystalline forms ...

is a gemstone. Opal or OPAL may also refer to:

Places

Canada

Opal, Alberta Opal is a hamlet in central Alberta, Canada within Thorhild County. It is located north of Highway 28, approximately northeast of Edmonton. Originally named Rutherford after Alberta's first premier, Alexander Cameron Rutherford but was rename ...

Opal Hills Opal Hills is a sub-range of the Queen Elizabeth Ranges in Jasper National Park, Alberta, Canada. There is an 8.2 km (5.1 mi) hiking trail. Climate Based on the Köppen climate classification, the Opal Hills are located in a subarc ...

, Jasper National Park, Alberta *

Opal Cone Opal Cone is a cinder cone located on the southeast flank of Mount Garibaldi in the Coast Mountains of British Columbia, Canada. It is the source of a long broad dacite lava flow with prominent wrinkled ridges. The lava flow is unusually long fo ...

, a volcano in British Columbia

United States

* Opal, Missouri, an unincorporated community *

Opal, South Dakota Opal is an unincorporated community in Meade County, in the U.S. state of South Dakota South Dakota (; Sioux language, Sioux: , ) is a U.S. state in the West North Central states, North Central region of the United States. It is also part ...

, an unincorporated community * Opal, Virginia, a census-designated place * Opal, Wyoming, a town

Science and technology

Biology and medicine

* Opal (apple), a variety of apple produced by crossing Golden Delicious and Topaz varieties * Opal (butterfly), common name for the butterfly genus ''Chrysoritis'' *

Omeprazole Omeprazole, sold under the brand names Prilosec and Losec, among others, is a medication used in the treatment of gastroesophageal reflux disease (GERD), peptic ulcer disease, and Zollinger–Ellison syndrome. It is also used to prevent upper ...

or Opal, a drug * Opal

phytolith Phytoliths (from Greek, "plant stone") are rigid, microscopic structures made of silica, found in some plant tissues and persisting after the decay of the plant. These plants take up silica from the soil, whereupon it is deposited within different ...

, a rigid microscopic body that occurs in many plants * Opal, a

stop codon In molecular biology (specifically protein biosynthesis), a stop codon (or termination codon) is a codon ( nucleotide triplet within messenger RNA) that signals the termination of the translation process of the current protein. Most codons in ...

* Open Air Laboratories, an initiative in England to get the public more involved with nature

Computing

* OPAL (software) (Open Physics Abstraction Layer), a real-time physics engine *

Opal programming language OPAL (OPtimized Applicative Language) is a functional programming language In computer science, functional programming is a programming paradigm where programs are constructed by applying and composing functions. It is a declarative progr ...

, developed at the Technical University of Berlin *

Open Phone Abstraction Library In the field of VoIP networking, the Open Phone Abstraction Library (OPAL) continues the open-source openh323 project to support a wide range of commonly used protocols used to send voice, video and fax data over IP networks rather than being ti ...

(OPAL), a fork of the H323plus project supporting H.323, SIP, IAX2 *

Opal Storage Specification The Opal Storage Specification is a set of specifications for features of data storage devices (such as hard disk drives and solid state drives) that enhance their security. For example, it defines a way of encrypting the stored data so that an u ...

, a storage specification developed by the Trusted Computing Group

Physics

Open-pool Australian lightwater reactor The Open-pool Australian lightwater reactor (OPAL) is a 20 megawatt (MW) swimming pool nuclear research reactor. Officially opened in April 2007, it replaced the High Flux Australian Reactor as Australia's only nuclear reactor, and is locat ...

, a scientific facility in Sydney, Australia * OPAL experiment and detector, of the Large Electron-Positron Collider at CERN

Arts and entertainment

* ''The Opal'' (annual), an annual gift book from 1844 to 1849 * Opal (band), a 1980s rock band from Los Angeles, US

Fictional entities

* Opal (''EastEnders'') a character on the BBC soap opera ''EastEnders'' * Opal (''The Simpsons''), a talk show host on ''The Simpsons'' *

Opal City Opal is a hydrated amorphous form of silica (SiO2·''n''H2O); its water content may range from 3 to 21% by weight, but is usually between 6 and 10%. Due to its amorphous property, it is classified as a mineraloid, unlike crystalline forms of ...

, a fictional city in the DC Comics universe * Opal, a fictional character in the Cartoon Network show ''Steven Universe'' * Opal, a fictional character in the Nickelodeon show ''

The Legend of Korra ''The Legend of Korra'' (abbreviated as TLOK), also known as ''Avatar: The Legend of Korra'' or simply ''Korra'', is an American Anime-influenced animation, anime-influenced Animated series, animated television series created by Michael Dante ...

'' * Opal, a Pokémon character in the video games ''Pokémon Sword and Shield''

Ships

* HMS ''Opal'', two ships of the British Royal Navy * USS ''Opal'' (PYc-8), a United States Navy patrol vessel during World War II

Transportation

Opal (fuel) Opal is a variety of low-aromatic 91 RON petrol developed in 2005 by BP Australia to combat the rising use of petrol as an inhalant in remote Indigenous Australian communities. Though more expensive to produce, requiring a $0.33/litre Federal sub ...

, a brand of petrol produced by BP Australia *

Opal (armoured personnel carrier) The ''Opal''-I is a multi-purpose fully amphibious armoured personnel carrier developed and produced by HSW S.A. in Poland. APC is a development of MT-LB that was produced in HSW under licence. Major changes are reworked nose section and fitted ...

, a Polish vehicle *

Opal card Opal is a contactless fare collection system for public transport services in the greater Sydney area and most other urban areas of New South Wales, Australia. Operation of the Opal system is managed by the New South Wales Government's transpo ...

, a smart card used on Sydney's transport network

Other uses

* Opal (given name) * OPAL pipeline, a natural gas pipeline in Germany * ''

The Opal ''The Opal'' (1851–1860) is a ten volume journal written, edited and printed by the patients of the Utica State Lunatic Asylum, circa 1851. On its more than 3,000 pages, writers talked of their experiences and world views, giving great insight ...

'', a journal written by the patients of the Utica State Lunatic Asylum c. 1851 * Tropical Storm Opal, several tropical cyclones worldwide have been named Opal *

Opal Telecom TalkTalk Business (trading name of TalkTalk Communications Ltd) is a business broadband, telephone, mobile phone and IT support provider owned by TalkTalk Group. The division supports approximately 180,000 UK businesses, and 350 resellers, that ...

, a former UK business broadband and telephone provider, now known as TalkTalk Business * Opal Tower (Leeds), a skyscraper in Leeds, England * Opal Tower (Sydney), a skyscraper in Sydney, Australia *

Australia women's national basketball team The Australian women's national basketball team is nicknamed the Opals, after the brightly coloured gemstone common to the country. From 1994 onwards, the Opals have been consistently competitive and successful having won nine medals at offi ...

or the Opals * Opal, a product by

Nói Síríus Nói Síríus is a family-owned chocolate and confection manufacturer in Iceland that was founded in 1920. Hallgrímur Benediktsson took over as main owner in the 1920s, and his grandson, Finnur Geirsson, was the company's president up until lat ...