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Fine emeralds have velvety body appearance and the value is in the even distribution of color. ... Iolite has a hardness of 7-7.5. It has good cleavage, as well as conchoidal and uneven fracture, with a brittle tenacity. The streak of iolite is white and it can have a greasy or vitreous luster. Iolite with inclusions of...
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www.emporia.edu/earthsci/amber/go340/gb1.htm
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The luster of emerald vitreous, although high quality emeralds have almost a velvety appearance. The color distribution is how the gems are evaluated(Chesterman 562). Columbia is the world's top producer of emeralds, in both quality and amount.
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www.emporia.edu/earthsci/amber/go336/sielert/emerald.ht...
www.emporia.edu/earthsci/amber/go336/sielert/emerald.htm
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Emerald - Wikipedia, the free encyclopedia
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Emeralds are a variety of the mineral beryl (Be 3 Al 2 ( SiO 3 ) 6 ,) colored green by trace amounts of chromium and sometimes vanadium. Beryl has a hardness of 7.5 - 8 on the 10 point Moh...
en.wikipedia.org/wiki/Emerald
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Transparency: transparent to opaque.Color of streak: white. Mohs`hardness:9 Density:3.97-4.05. Cleavage:none. Fracture:small conchoidal, splintery, brittle. Crystal system: ( Trigonal ) hexagonal prisms or tables, rhombohedrons.
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www.unido-aaitpc.org/unido-aaitpc/new1/mozambique/Gemst...
www.unido-aaitpc.org/unido-aaitpc/new1/mozambique/Gemstones.pdf
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These traits include hardness, color, streak, luster, cleavage or fracture, and specific gravity. ... Cleavage and fracture. Some minerals, when struck with force, will cleanly break along smooth planes that are parallel to each other. This breakage is called cleavage and is determined by the way a mineral's atoms...
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www.scienceclarified.com/Ma-Mu/Minerals.html
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IV. Streak; --is the color of the powder from the mineral on a porcelain plate (streak plate)--; --since most minerals are softer than porcelain (8 hardness on Moh's Scale), their powder will remain after scratching it on the ... Cleavage, Parting, Fracture, Specific Gravity and Crystal Habit; A. Cleavage;
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courses.missouristate.edu/EMantei/Mineralogy/PhysicalPr...
courses.missouristate.edu/EMantei/Mineralogy/PhysicalProp.html
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Probably from the Latin, granatum malum, meaning "pomegranate." ... Description and Occurrence ... Color Streak Transparency Luster Hardness Cleavage Fracture Specific gravity Crystal form...
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www.sdnhm.org/fieldguide/minerals/garnet.html
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We carry Colombian & Brazilian Emeralds, to serve manufacturers, ... Color: Emerald green, light green, yellow-green, dark green; Color of streak: White; Mohs' hardness: 7.5-8; Specific gravity: 2.67-2.78; Cleavage: None; Fracture: Small conchoidal, uneven, brittle; Crystal system: Hexagonal (trigonal);
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www.colorstones.com/emerald.htm
www.colorstones.com/emerald.htm
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Describes physical characteristics of minerals; color, idiochromatism, allochromatism, streak, luster, density, hardness, Mohs scale, cleavage, fracture, tenacity, crystal habit. ... These traits include color, streak, luster, density, hardness, cleavage, fracture, tenacity, and crystal habit. Certain wavelengths of light...
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dave.ucsc.edu/myrtreia/physical_character.html
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