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The English word is both a noun and an adjective; from Latin adamans 'impregnable, diamondlike hardness; very firm/resolute position', from Greek adamastos 'untameable' (hence also the word diamond). Adamant or adamantine (suffix -ine 'of the nature of' or 'made of') occur in many works.
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.
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
For example, anatase is less hard (5.5–6 vs. 6–6.5 on the Mohs scale) and less dense (specific gravity about 3.9 vs. 4.2) than rutile. Anatase is also optically negative, whereas rutile is optically positive. Anatase has a more strongly adamantine or metallic-adamantine luster than that of rutile as well. [8]
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]
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Broken English: 1996 Rated NC-17 for explicit sexuality; edited version rated R for language, violence, and some drug content. [22] The Canterbury Tales (I Racconti di Canterbury) 1972 Originally rated X in 1979; name of rating changed to NC-17 in 1991. [23] Comfortably Numb: 1995 Rated NC-17 for scenes of graphic drug use and some explicit ...