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  2. Opal - Wikipedia

    en.wikipedia.org/wiki/Opal

    A Peruvian opal (also called blue opal) is a semi-opaque to opaque blue-green stone found in Peru, which is often cut to include the matrix in the more opaque stones. It does not display a play of color. Blue opal also comes from Oregon and Idaho in the Owyhee region, as well as from Nevada around the Virgin Valley. [17] Opal is also formed by ...

  3. National symbols of Australia - Wikipedia

    en.wikipedia.org/wiki/National_symbols_of_Australia

    Australia portal: Symbol Name Image Declared References National flag: ... Opal: 27 July 1993 [10] See also. Australia portal; District tartans of Australia;

  4. List of individual gemstones - Wikipedia

    en.wikipedia.org/wiki/List_of_individual_gemstones

    Andamooka Opal, presented to Queen Elizabeth II, also known as the Queen's Opal; Flame Queen Opal; Galaxy Opal; Halley's Comet Opal, the world's largest uncut black opal; Olympic Australis Opal, reported to be the largest and most valuable gem opal ever found

  5. Opal Storage Specification - Wikipedia

    en.wikipedia.org/wiki/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 unauthorized person who gains possession of the device cannot see the data.

  6. Menilite - Wikipedia

    en.wikipedia.org/wiki/Menilite

    Menilite Menilite. Menilite is a greyish-brown form of the mineraloid opal. [1] It is also known as liver opal or leberopal (German), due to its color. It is called menilite because it was first described from Ménilmontant (), France, [1] where it occurs as concretions within bituminous Early Oligocene Menilite Shales.

  7. Opalescence - Wikipedia

    en.wikipedia.org/wiki/Opalescence

    Each of the three notable types of opal – precious, common, and fire [3] – display different optical effects; therefore, the intended meaning varies depending on context. The general definition of opalescence is a milky iridescence displayed by an opal, which describes the visual effect of precious opal very well, and opalescence is ...

  8. One People of Australia League - Wikipedia

    en.wikipedia.org/wiki/One_People_of_Australia_League

    The One People of Australia League (often abbreviated OPAL) was an Australian Aboriginal political grouping in the 1960s and the 1970s. In contrast to the more radical and left-wing bodies advocating for indigenous sovereignty at the time, OPAL was for most of its existence overtly assimilationist, advocating for the integration of Aboriginal Australians into mainstream white culture. [1]

  9. Halley's Comet Opal - Wikipedia

    en.wikipedia.org/wiki/Halley's_Comet_Opal

    The Halley's Comet Opal is a very fine specimen, with few flaws or blemishes and a large green and orange 1.6 cm (0.63 in) thick color bar which goes through the opal. Formed about 20 million years ago, it is an example of a nobby, which is a natural lump-shaped opal found only at Lightning Ridge. [2] As of 2006 it was for sale at $1.2 million. [3]