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  2. Euxenite - Wikipedia

    en.wikipedia.org/wiki/Euxenite

    Black, brownish black, greenish black: Crystal habit: Massive, anhedral crystals in matrix ... (the official mineralogical name), is a brownish black mineral with a ...

  3. List of gemstones by species - Wikipedia

    en.wikipedia.org/wiki/List_of_gemstones_by_species

    Gadolinite; Gahnite; Gahnospinel; Garnet group: Pyralspite. Almandine; Pyrope; Spessartine; Ugrandite. Andradite. Demantoid; Melanite; Topazolite; Grossular ...

  4. Tenorite - Wikipedia

    en.wikipedia.org/wiki/Tenorite

    Tenorite, sometimes also called Black Copper, is a copper oxide mineral with the chemical formula CuO. The chemical name is Copper(II) oxide or cupric oxide. Occurrence

  5. List of minerals - Wikipedia

    en.wikipedia.org/wiki/List_of_minerals

    Differences in chemical composition and crystal structure distinguish the various species. Within a mineral species there may be variation in physical properties or minor amounts of impurities that are recognized by mineralogists or wider society as a mineral variety. Mineral variety names are listed after the valid minerals for each letter.

  6. Carbonado - Wikipedia

    en.wikipedia.org/wiki/Carbonado

    Carbonado, commonly known as black diamond, is one of the toughest forms of natural diamond. It is an impure, high-density, micro-porous form of polycrystalline diamond consisting of diamond, graphite , and amorphous carbon , with minor crystalline precipitates filling pores and occasional reduced metal inclusions. [ 1 ]

  7. List of individual gemstones - Wikipedia

    en.wikipedia.org/wiki/List_of_individual_gemstones

    Samarian Spinel, the world's largest spinel; Menshikov Ruby, the world's second largest spinel set on top of the Great Imperial Crown of Russia; Timur Ruby, believed to be a ruby until 1851, hence its name

  8. Jet (gemstone) - Wikipedia

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

    Jet is a type of lignite, [1] the lowest rank of coal, and is a gemstone.Unlike many gemstones, jet is not a mineral, but is rather a mineraloid. [2] It is derived from wood that has changed under extreme pressure.

  9. Cylindrite - Wikipedia

    en.wikipedia.org/wiki/Cylindrite

    It has a black to lead grey metallic colour with a Mohs hardness of 2 to 3 and a specific gravity of 5.4. It was first discovered in the Santa Cruz mine, Oruro Department, Bolivia in 1893. The name arises from its curious cylindrical crystal which it forms almost uniquely among minerals.

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