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