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Band theory explains the colors of metallic minerals; the color range black-red-orange-yellow-colorless in minerals such as ... Consider now a mineral containing, say, ... 2f). The almost equally balanced red and blue-green transmission bands result in the eye perceiving either the one or the other as dominant,
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www.minsocam.org/MSA/collectors_corner/arc/color.htm
www.minsocam.org/MSA/collectors_corner/arc/color.htm
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Igneous rocks are formed when molten rock is either ejected directly onto the earth's surface (extrusive rock) or pushes up near the surface and cools beneath it (intrusive rock). ... For example, gold is described as a golden yellow, opaque mineral with a metallic lustre and a hardness of 2.5-3. Its crystals are cube...
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www.francesjane.com/minframe.html
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Lode Deposits: Ore deposits can are broadly broken down into two groups, called “lode” and “placer”. ... Where this concentration happens, the unconsolidated sediments in the stream can become enriched enough with valuable minerals to be classified as ore deposits. ... Opaque: Does not allow light to pass through.
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www.dmtcalaska.org/exploration/ISU/unit1/u1vocab1.html
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Luster: Three main types are metallic, ... Metallic: means it is bright and shiny like a metal, and opaque (non translucent), ... Like igneous rocks, they are classified according to their composition and grain size. Sedimentary rocks can be important host rocks for either mineral or petroleum deposits. The most common types...
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www.dmtcalaska.org/exploration/ISU/unit1/u1lesson1.html
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Graphitic Marble - Graphitic marble is a type of marble that contains appreciable amounts of graphite, a steel-gray to black mineral comprised of carbon. Opaque and very soft, graphite deposits in marble usually appear as gray or silver flakes ... However, the fibrous form of the mineral, which has a characteristic luster,
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micro.magnet.fsu.edu/primer/techniques/polarized/galler...
micro.magnet.fsu.edu/primer/techniques/polarized/gallery/pages/rocksindex.html
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The mineral pyrite, or iron pyrite, is an iron sulfide with the formula FeS2. This mineral's metallic luster and pale-to-normal, brass-yellow hue have earned it ... Arsenopyrite is an iron arsenic sulfide . It is a hard metallic, opaque, steel grey to silver white mineral with a relatively high specific gravity of 6.1.
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www.absoluteastronomy.com/topics/Sulfide
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The pigments themselves can be broadly classified as either organic (derived from living organisms) or inorganic (minerals). ... Inorganic pigments are of mineral origin, some of which include ... Metallic Paints; These paints actually include metal particles that simulate the luster of such metals as gold, silver and bronze.
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www.macphersonart.com/maclive/getstarted/paints/paints....
www.macphersonart.com/maclive/getstarted/paints/paints.htm
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1.3.2. Luster and transparency. The way a mineral transmits or reflects light is a diagnostic property. The transparency may be either opaque, translucent, or transparent. This reflectance property is called luster. ... Metallic minerals are either white, gray, or yellow.
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ruby.colorado.edu/~smyth/G30101.html
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Minerals are either opaque or transparent. A thin section of an opaque mineral such as a metal will not transmit light, whereas a thin section of a transparent mineral will. Typically those minerals which possess metallic bonding are opaque whereas those where ionic bonding is prevalent are transparent.
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dave.ucsc.edu/myrtreia/physical_character.html
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