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  2. Marcasite - Wikipedia

    en.wikipedia.org/wiki/Marcasite

    Marcasite reacts more readily than pyrite under conditions of high humidity. The product of this disintegration is iron(II) sulfate and sulfuric acid. The hydrous iron sulfate forms a white powder consisting of the mineral melanterite, FeSO 4 ·7H 2 O. [13] This disintegration of marcasite in mineral collections is known as "pyrite decay".

  3. Marcasite jewellery - Wikipedia

    en.wikipedia.org/wiki/Marcasite_jewellery

    Marcasite jewellery is jewellery made using cut and polished pieces of pyrite (fool's gold) as gemstone, and not, as the name suggests, from marcasite. [1] Both pyrite and marcasite are chemically iron sulfide, but differ in their crystal structures, giving them different physical properties. Pyrite is more stable and less brittle than marcasite.

  4. Wikipedia : WikiProject Gemology and Jewelry/Gemstones

    en.wikipedia.org/wiki/Wikipedia:WikiProject...

    Metaphysical characteristics of gems Pranic and Vedic meanings; Modern metaphysics; ... Marcasite - a misnomer for pyrites; Melinophane; Mesolite; Microlite; Moissanite.

  5. Pyrrhotite - Wikipedia

    en.wikipedia.org/wiki/Pyrrhotite

    Streak can be used when properties between pyrrhotite and other sulfide minerals are similar. Pyrrhotite displays a dark grey to black streak. [ 15 ] Pyrite will display a greenish black to brownish black streak, [ 16 ] chalcopyrite will display a greenish black streak, [ 17 ] and pentlandite leaves a pale bronze-brown streak. [ 18 ]

  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. Tiger's eye - Wikipedia

    en.wikipedia.org/wiki/Tiger's_eye

    Tiger's eye (also called tiger eye) is a chatoyant gemstone that is usually a metamorphic rock with a golden to red-brown colour and a silky lustre.As members of the quartz group, tiger's eye and the related blue-coloured mineral hawk's eye gain their silky, lustrous appearance from the parallel intergrowth of quartz crystals and altered amphibole fibres that have mostly turned into limonite.

  8. History of mineralogy - Wikipedia

    en.wikipedia.org/wiki/History_of_mineralogy

    The metaphysical emanation and exhalation (anathumiaseis) theory of Aristotle included early speculation on earth sciences including mineralogy. According to his theory, while metals were supposed to be congealed by means of moist exhalation, dry gaseous exhalation ( pneumatodestera ) was the efficient material cause of minerals found in the ...

  9. Moonstone (gemstone) - Wikipedia

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

    The name moonstone derives from the stone's characteristic visual effect, called adularescence (or schiller), which produces a milky, bluish interior light. This effect is caused by light diffraction through alternating layers of orthoclase and albite within the stone.

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