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  2. Corundum - Wikipedia

    en.wikipedia.org/wiki/Corundum

    Corundum is a crystalline form of aluminium oxide (Al 2 O 3) typically containing traces of iron, titanium, vanadium, and chromium. [3] [4] It is a rock-forming mineral.It is a naturally transparent material, but can have different colors depending on the presence of transition metal impurities in its crystalline structure. [7]

  3. Carbuncle (gemstone) - Wikipedia

    en.wikipedia.org/wiki/Carbuncle_(gemstone)

    A polished almandine stone . Carbuncle (/ ˈ k ɑːr b ʌ ŋ k əl /) is another name for a deep red almandine gemstone that has been cut with a smooth, convex face in a method called cabochon. [1] Traditionally, the term referred to any red gemstone, most often a red garnet. [2] Carbuncles and their chimeras have spanned three millennia.

  4. Interference colour chart - Wikipedia

    en.wikipedia.org/wiki/Interference_colour_chart

    Michel-Lévy interference colour chart issued by Zeiss Microscopy. In optical mineralogy, an interference colour chart, also known as the Michel-Levy chart, is a tool first developed by Auguste Michel-Lévy to identify minerals in thin section using a petrographic microscope.

  5. Sharpening stone - Wikipedia

    en.wikipedia.org/wiki/Sharpening_stone

    Artificial stones usually come in the form of a bonded abrasive composed of a ceramic such as silicon carbide (carborundum); aluminium oxide (corundum, also known as water stone or India stone); and CBN (cubic boron nitride). They provide more aggressive cutting action than natural stones, and are used for the middle stages of knife sharpening ...

  6. Lapidary (text) - Wikipedia

    en.wikipedia.org/wiki/Lapidary_(text)

    A lapidary is a text in verse or prose, often a whole book, that describes the physical properties and metaphysical virtues of precious and semi-precious stones, that is to say, a work on gemology. [1] It was frequently used as a medical textbook, since it also includes practical information about the supposed medical application of each stone ...

  7. Silicon carbide - Wikipedia

    en.wikipedia.org/wiki/Silicon_carbide

    Silicon carbide (SiC), also known as carborundum (/ ˌ k ɑːr b ə ˈ r ʌ n d əm /), is a hard chemical compound containing silicon and carbon. A wide bandgap semiconductor , it occurs in nature as the extremely rare mineral moissanite , but has been mass-produced as a powder and crystal since 1893 for use as an abrasive .

  8. Alchemical symbol - Wikipedia

    en.wikipedia.org/wiki/Alchemical_symbol

    The squared circle: an alchemical symbol (17th century) illustrating the interplay of the four elements of matter symbolising the philosopher's stone. Antimony ♁ (in Newton), also ; Arsenic 🜺 Bismuth ♆ (in Newton), 🜘 (in Bergman) Cobalt (approximately 🜶) (in Bergman) Manganese (in Bergman)

  9. Emery (rock) - Wikipedia

    en.wikipedia.org/wiki/Emery_(rock)

    Emery mine on Naxos Island Corundite from the Naxos emery deposits. The corundum is blue, or sapphire.Wet slab, 10 cm (3.9 in) wide. Emery, or corundite, is a dark granular rock used to make an abrasive powder.

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