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Number Sample Colour name Description, examples RAL 2000: Yellow orange: RAL 2001: Red orange: RAL 2002: Blood orange: U2 line of the Berlin U-Bahn: RAL 2003: Pastel orange: U9 line of the Berlin U-Bahn; the Helsinki Metro system
Opalescence or play of color is an optical phenomenon associated with the mineraloid gemstone opal, [1] a hydrated silicon dioxide. [2] This effect appears as a milky, translucent glow that changes with the angle of light, often creating a soft, pearly sheen that can display various colors or hues.
There are two broad classes of opal: precious and common. Precious opal displays play-of-color (iridescence); common opal does not. [5] Play-of-color is defined as "a pseudo chromatic optical effect resulting in flashes of colored light from certain minerals, as they are turned in white light."
Opal (formerly Fayettesville) is an unincorporated community and census-designated place (CDP) in Fauquier County, Virginia, United States. It is on U.S. Highway 15 / U.S. Route 17 and U.S. Route 29 , at an elevation of 449 feet (137 m). [ 1 ]
This is an accepted version of this page This is the latest accepted revision, reviewed on 14 December 2024. For other color lists, see Lists of colors. This article relies largely or entirely on a single source. Relevant discussion may be found on the talk page. Please help improve this article by introducing citations to additional sources. Find sources: "List of colors" alphabetical ...
Meet the "Virgin Rainbow" – perhaps the finest and certainly the most expensive opal on record. It literally glows in the dark. In fact, as it gets darker around the opal, the opal appears ...
When using the chart, it is important to remember these tips: Isotropic and opaque (metallic) minerals cannot be identified this way. The stage of the microscope should be rotated until maximum colour is found, and therefore, the maximum birefringence. Each mineral, depending on the orientation, may not exhibit the maximum birefringence.
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]