earthy lustre

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• Lustre (mineralogy) — Lustre (or luster) is a description of the way light interacts with the surface of a crystal, rock, or mineral. The word lustre traces its origins back to the Latin word lux, meaning light , and generally implies radiance, gloss, or brilliance. A …   Wikipedia

• lustre — /lus teuhr/, n., v.t., v.i., lustred, lustring. Chiefly Brit. luster. * * * In mineralogy, the appearance of a mineral surface in terms of its light reflecting qualities. Lustre depends on a mineral s refractivity (see refraction), transparency,… …   Universalium

• Håleniusite-(La) — (La,Ce)OF is a yellow isometric mineral named in honor of Prof. Ulf Hålenius, director of the mineralogy department at the Swedish Museum of Natural History in Stockholm, Sweden. It was descovered in 1986 and has a dull, earthy lustre. The… …   Wikipedia

• South Asian arts — Literary, performing, and visual arts of India, Pakistan, Bangladesh, and Sri Lanka. Myths of the popular gods, Vishnu and Shiva, in the Puranas (ancient tales) and the Mahabharata and Ramayana epics, supply material for representational and… …   Universalium

• Oxide minerals — ▪ Table Oxide minerals name colour lustre Mohs hardness specific gravity anatase brown to indigo blue and black; also variable adamantine to metallic adamantine 5½–6 3.8–4.0 boehmite white, when pure 3 3.0–3.1 brookite various browns metallic… …   Universalium

• mica — micalike, adj. /muy keuh/, n. any member of a group of minerals, hydrous silicates of aluminum with other bases, chiefly potassium, magnesium, iron, and lithium, that separate readily into thin, tough, often transparent, and usually elastic… …   Universalium

• Fracture (mineralogy) — This article is about the terminology used to describe fracture surfaces. For fractures in rocks and minerals per se, see Fracture (geology) In the field of mineralogy, fracture is a term used to describe the shape and texture of the surface… …   Wikipedia

• hematite — hematitic /hee meuh tit ik, hem euh /, adj. /hee meuh tuyt , hem euh /, n. a very common mineral, iron oxide, Fe2O3, occurring in steel gray to black crystals and in red earthy masses: the principal ore of iron. [1535 45; < L haematites… …   Universalium

• Borate minerals — ▪ Table Borate minerals name colour lustre Mohs hardness specific gravity boracite colourless or white vitreous 7–7½ 2.9–3.0 borax colourless to white; grayish, bluish, greenish vitreous to resinous 2–2½ 1.7 colemanite colourless; white,… …   Universalium

• Anglesite — Infobox mineral name = Anglesite category = Sulfate mineral boxwidth = boxbgcolor = imagesize = caption = formula = PbSO4 molweight = color = Colorless to white, commonly tintedgray; orange, yellow, green, blue, rarely violet habit = Granular,… …   Wikipedia

• Melaconite — is a mineral consisting of cupric oxide, CuO. It is known also as black copper ore. In appearance it is strikingly different from cuprite or red copper ore, which is cuprous oxide. Crystals are rare; they belong to the monoclinic, or possibly to… …   Wikipedia