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The term porphyry is from the Ancient Greek πορφύρα (porphyra), meaning "purple". Purple was the colour of royalty, and the Roman "imperial porphyry" was a deep purple igneous rock with large crystals of plagioclase. Some authors claimed the rock was the hardest known in antiquity.
The ideal grade, called "Deep Siberian", has a primary purple hue of around 75–80%, with 15–20% blue and (depending on the light source) red secondary hues. [7] ". Rose de France" is defined by its markedly light shade of the purple, reminiscent of a lavender / lilac shade.
Charoite is translucent lavender to purple in color with a pearly luster. Charoite is strictly massive in nature, and fractures are conchoidal . It has an unusual swirling, fibrous appearance, sometimes chatoyant , and that, along with its intense color, can lead many to believe at first that it is synthetic or enhanced artificially.
As a result of this phenomenon, a multitude of colors have been observed in various specimens: shades of purple, violet, indigo, blue, cyan, green, yellow, orange, red and brown. After heating, tanzanite becomes dichroic .
Blue John (also known as Derbyshire Spar) is a semi-precious mineral, a rare form of fluorite with bands of a purple-blue or yellowish colour. In the United Kingdom it is found only at Blue John Cavern and Treak Cliff Cavern at Castleton in Derbyshire.
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Purple and violet. Amethyst (very low): different shades of purple; Andalusite (strong): green-brown / dark red / purple; Beryl (medium): purple / colorless; Corundum (high): purple / orange; Hypersthene (strong): purple / orange; Spodumene (strong): purple / clear / pink; Tourmaline (strong): pale purple / purple; Putnisite: pale purple ...
Traditionally, born in the purple (sometimes "born to the purple") was a category of members of royal families born during the reign of their parent. This notion was later loosely expanded to include all children born of prominent or high-ranking parents.
The amethyst is a brilliant transparent stone of a purple colour and varies in shade from violet purple to rose. There are two kinds of amethysts: the oriental amethyst, a species of sapphire that is very hard (cf. Heb., hlm ), and when colourless is almost indistinguishable from the diamond .
It is typically blue, but natural "fancy" sapphires also occur in yellow, purple, orange, and green colors; "parti sapphires" show two or more colors. Red corundum stones also occur, but are called rubies rather than sapphires. [3]
Turquoise is an opaque, blue-to-green mineral that is a hydrous phosphate of copper and aluminium, with the chemical formula Cu Al 6 ( P O 4) 4 (O H) 8· 4 H 2 O. It is rare and valuable in finer grades and has been prized as a gem and ornamental stone for thousands of years owing to its unique hue. A turquoise dome of the Po-i-Kalyan Mosque in ...