Ads
related to: what color is the purple stone crystal
Search results
Results from the WOW.Com Content Network
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.
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 .
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.
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.