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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 ...
In its non-geologic, traditional use, the term porphyry usually refers to the purple-red form of this stone, valued for its appearance, but other colours of decorative porphyry are also used such as "green", "black" and "grey".
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.
Crystal system: Hexagonal: Identification; Formula mass: 60.08 g/mol: Color: Purple, Yellow: Crystal habit: 6-sided prism ending in 6-sided pyramid (typical) Twinning: Dauphine law and Brazil law: Cleavage: none: Fracture: Conchoidal: Mohs scale hardness: 7: Lustre: Vitreous: Streak: white: Diaphaneity: Transparent to translucent: Specific ...
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. The occidental amethyst is of the silex family and is ...
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Afghanistan; Shades of blue – Variety of the color blue; Ultramarine – Deep blue purple color pigment which was originally made with ground lapis lazuli; References
Color change sapphires are blue in outdoor light and purple under incandescent indoor light, or green to gray-green in daylight and pink to reddish-violet in incandescent light. Color-change sapphires come from a variety of locations, including Madagascar, Myanmar, Sri Lanka and Tanzania. Two types exist.
Tourmaline ( / ˈtʊərməlɪn, - ˌliːn / TOOR-mə-lin, -leen) is a crystalline silicate mineral group in which boron is compounded with elements such as aluminium, iron, magnesium, sodium, lithium, or potassium. This gemstone comes in a wide variety of colors.
Piemontite occurs as small, reddish-black, monoclinic crystals in the manganese mines at San Marcel, near Ivrea in Piedmont, and in crystalline schists at several places in Japan. The purple color of the Egyptian porfido rosso antico is due to the presence of this mineral.
Crystal system: Trigonal: Crystal class: Hexagonal scalenohedral (3 m) H-M symbol: (3 2/m) Space group: R 3 c (No. 167) Unit cell: a = 4.75 Å, c = 12.982 Å; Z = 6: Identification; Color: Colorless, gray, golden-brown, brown; purple, pink to red, orange, yellow, green, blue, violet; may be color zoned, asteriated mainly grey and brown: Crystal ...