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Crocoite is commonly found as large, well-developed prismatic adamantine crystals, although in many cases are poorly terminated. Crystals are of a bright hyacinth-red color, translucent, and have an adamantine to vitreous lustre. On exposure to UV light some of the translucency and brilliancy is lost.
Lustre (British English) or luster (American English; see spelling differences) is the way light interacts with the surface of a crystal, rock, or mineral. The word traces its origins back to the Latin lux , meaning "light", and generally implies radiance, gloss, or brilliance.
Crystals are of frequent occurrence and they usually have very bright and smooth faces. The mineral also occurs in compact granular masses, and sometimes in fibrous forms. The mineral is usually colorless or white, sometimes grey or greenish in tint and varies from transparent to translucent with an adamantine lustre.
This page was last edited on 26 March 2018, at 05:55 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may ...
Adamantine may refer to: Adamant or adamantine, a generic name for a very hard material; Adamantine (veneer), a patented celluloid veneer; Adamantine lustre, a property of some minerals; Adamantine spar, a mineral; Adamantine, a 2018 album by Burgerkill "Adamantine", a 1996 song by Thirty Ought Six, released as Mute Records 196
Cinnabar is generally found in a massive, granular, or earthy form and is bright scarlet to brick-red in color, though it occasionally occurs in crystals with a nonmetallic adamantine luster. [12] [13] It resembles quartz in its symmetry. It exhibits birefringence, and it has the second-highest refractive index of any mineral. [14]
It could be used in oil paint and watercolour for glazing, shadows, flesh tones, and shading. [ 2 ] The modern equivalent sold as "mummy brown" is composed of a mixture of kaolin , quartz , goethite , and hematite , with the hematite and goethite (generally 60% of the content) determining the colour.
The luster of a diamond is described as "adamantine", which simply means diamond-like. Reflections on a properly cut diamond's facets are undistorted, due to their flatness. The refractive index of diamond (as measured via sodium light, 589.3 nm) is 2.417. Because it is cubic in structure, diamond is also isotropic.
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