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  2. Lapidary - Wikipedia

    en.wikipedia.org/wiki/Lapidary

    Medieval Christians often associated gemstones with biblical figures, virtues, and divine forces. Lapidaries like the Peterborough Lapidary reinforced the idea that stones had sacred meanings, offering protection and spiritual benefits to those who used them correctly. Beinert suggests that these texts served as “windows on a medieval world ...

  3. Crystal healing - Wikipedia

    en.wikipedia.org/wiki/Crystal_healing

    Crystal healing is a pseudoscientific alternative-medicine practice that uses semiprecious stones and crystals such as quartz, agate, amethyst or opal. Despite the common use of the term "crystal", many popular stones used in crystal healing, such as obsidian, are not technically crystals. Adherents of the practice claim that these have healing ...

  4. 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.

  5. 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]

  6. 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 .

  7. 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 ...

  8. Gemstones in the Bible - Wikipedia

    en.wikipedia.org/wiki/Gemstones_in_the_Bible

    It is the seventh stone in Ezekiel 28:13 (in the Hebrew text, but occurring fifth in the Greek translation). The stones is also mentioned with frequency elsewhere (Exodus 24:10, Job 28:6,16, Song 5:14, Isaiah 54:11, Lamentations 4:7; Ezekiel 1:26, 10:1). Sappheiros is also the second foundation stone of the celestial Jerusalem (Revelations 21:19).

  9. Wawel Chakra - Wikipedia

    en.wikipedia.org/wiki/Wawel_Chakra

    The stone may be either a legend, a metaphor [10], a metaphorical source of positive terrestrial radiation or source of spiritual forces, or an actual amulet inside the walls. According to Polish geomant and dowser Leszek Matela , [ 11 ] there is unusual radiation there, both cosmic and terrestrial, emanated by subterranean water veins ...

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