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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.
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 .
Lapis lazuli ( UK: / ˌlæpɪs ˈlæz ( j) ʊli, ˈlæʒʊ -, - ˌli /; US: / ˈlæz ( j) əli, ˈlæʒə -, - ˌli / ), or lapis for short, is a deep-blue metamorphic rock used as a semi-precious stone that has been prized since antiquity for its intense color.
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.
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 ...
Why Is the Color Purple Used? Purple is a color that not only stands out in nature, and since it is such an unexpected color, it catches people's attention.
The stone intended may be the sapphire. In Revelation 9:17, the word appears in adjective form (hyakinthinous, "hyacinthine"); this, again, is thought to be descriptive of a blue or purple colour, with no reference to the modern jacinth stone. References
Massive jadeite also characteristically shows a more granular texture than nephrite or serpentinite. [8] Jadeite has a fusibility of 2.5 (making it moderately easy to fuse with a propane flame) and gives a yellow flame color. [8] Pure jadeite has the composition NaAlSi2O6 and has the typical clinopyroxene structure.
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 .