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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. [3]
Color: Purple, violet, dark purple: Crystal habit: 6 sided prism ending in 6 sided pyramid (typical) Twinning: Dauphine law, Brazil law, and Japan law: Cleavage: None: Fracture: Conchoidal: Mohs scale hardness: 7 (lower in impure varieties) Luster: Vitreous/glassy: Streak: White: Diaphaneity: Transparent to translucent: Specific gravity: 2.65 ...
Lapis armenus – Precious stone resembling lapis lazuli; Sar-i Sang – town in Badakhshan Province, Afghanistan; Shades of blue – Variety of the color blue; Ultramarine – Deep blue purple color pigment which was originally made with ground lapis lazuli; References
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. The dichroic colours range from violet through bluish-violet to indigo and violetish-blue to blue.
Topaz is often treated with heat or radiation to make it a deep blue, reddish-orange, pale green, pink, or purple. [8] Topaz is a nesosilicate mineral, and more specifically, an aluminosilicate mineral. [9] It is one of the hardest naturally occurring minerals and has a relatively low index of refraction.
The philosopher's stone is created by the alchemical method known as The Magnum Opus or The Great Work. Often expressed as a series of color changes or chemical processes, the instructions for creating the philosopher's stone are varied. When expressed in colours, the work may pass through phases of nigredo, albedo, citrinitas, and rubedo.
Properties. 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.
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
Corundum (high): purple / orange; Hypersthene (strong): purple / orange; Spodumene (strong): purple / clear / pink; Tourmaline (strong): pale purple / purple; Putnisite: pale purple / bluish grey; Blue. Aquamarine (medium): clear / light blue, or light blue / dark blue; Alexandrite (strong): dark red-purple / orange / green
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 .