Ruby - Wikipedia, the free encyclopedia
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A ruby is a pink to blood-red gemstone, a variety of the mineral corundum (aluminium oxide). The red color is caused mainly by the presence of the element chromium. Its name comes from ruber , Lat...
en.wikipedia.org/wiki/Ruby
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These traits include hardness, color, streak, luster, cleavage or fracture, and specific gravity. ... The beauty of a gem depends on its luster, color, and hardness. The so-called precious stones are diamond, ruby, sapphire, and emerald. Some semiprecious stones are amethyst, topaz, garnet, opal, turquoise, and jade.
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www.scienceclarified.com/Ma-Mu/Minerals.html
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It is considered to be more valuable than both the star ruby and the star sapphire. ... 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 hematite...
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www.emporia.edu/earthsci/amber/go340/gb1.htm
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3. Check for Cleavage or Fracture. Minerals with ‘good ‘cleavage should show that cleavage readily. In fact, if a mineral has good cleavage ... 14. The minerals magnetite and pyrite both have metallic luster, black streak, are hard, and have irregular fracture. How would you tell the difference between these minerals?
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cees.tamiu.edu/cees/courses/geol1103/02_Nonsilicate_Min...
cees.tamiu.edu/cees/courses/geol1103/02_Nonsilicate_Minerals.pdf
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Help on Fracture: ... Help on Cleavage: ... Help on Luster:
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webmineral.com/data/Corundum.shtml
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Luster... Luster is a description of the way light behaves when it hits the surface of a crystal. ... Streak... When a mineral is rubbed firmly across a streak plate, ... Cleavage or Fracture... In our first lab identifying minerals, we talked about cleavage and fracture as being "how the mineral breaks apart." So,
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www.rockabrain.com/pages/lc_minerals.htm
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Imperfect, fracture subconchoidal to uneven. ... Ruby is the name of red colored corundum. The red color comes from chromium. Sapphire is the name of blue corundum. As corundum is so hard it is often found in placer deposits. Often transformed into margarite on the surface.
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www.geology.neab.net/minerals/corundum.htm
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1.3.2. Luster and transparency. ... 1.3.3. Color and streak. ... 1.3.4. Cleavage, fracture, and parting. Because bonding is not of equal strength in all directions in most crystals, they will tend to break along crystallographic directions giving them a fracture property that reflects the underlying structure and is...
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ruby.colorado.edu/~smyth/G30101.html
ruby.colorado.edu/~smyth/G30101.html
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There are 366 Ruby gemstones available at Multicolour.com ... Our Ruby(s) are available in various shapes, sizes and colors. 366 Ruby(s), too many to look through? You may select any combination of search options. Colors grade into each other and you can search for more than one color at once.
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www.multicolour.com/gemstones/ruby.html
www.multicolour.com/gemstones/ruby.html
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