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  2. Vivianite - Wikipedia

    en.wikipedia.org/wiki/Vivianite

    Vivianite is a soft mineral, with Mohs hardness only 1 + 1 ⁄ 2 to 2, and specific gravity 2.7. It splits easily, with perfect cleavage perpendicular to the b-crystal axis, due to the sheet-like structure of the mineral. It is sectile, with a fibrous fracture, and thin laminae parallel to the cleavage plane are flexible. It is easily soluble ...

  3. Talc - Wikipedia

    en.wikipedia.org/wiki/Talc

    The Mohs scale of mineral hardness, based on scratch hardness comparison, defines value 1 as the hardness of talc, the softest mineral. When scraped on a streak plate , talc produces a white streak, though this indicator is of little importance, because most silicate minerals produce a white streak.

  4. List of minerals - Wikipedia

    en.wikipedia.org/wiki/List_of_minerals

    Amethyst crystals – a purple quartz Apophyllite crystals sitting right beside a cluster of peachy bowtie stilbite Aquamarine variety of beryl with tourmaline on orthoclase Arsenopyrite from Hidalgo del Parral, Chihuahua, Mexico Aurichalcite needles spraying out within a protected pocket lined by bladed calcite crystals Austinite from the Ojuela Mine, Mapimí, Durango, Mexico Ametrine ...

  5. Mineralized tissues - Wikipedia

    en.wikipedia.org/wiki/Mineralized_tissues

    Mineralized tissues combine stiffness, low weight, strength and toughness due to the presence of minerals (the inorganic part) in soft protein networks and tissues (the organic part). [ 1 ] [ 2 ] There are approximately 60 different minerals generated through biological processes, but the most common ones are calcium carbonate found in mollusk ...

  6. Tooth enamel - Wikipedia

    en.wikipedia.org/wiki/Tooth_enamel

    The normal color of enamel varies from light yellow to grayish (bluish) white. It has been suggested that the color is determined by differences in the translucency of enamel, yellowish teeth having a thin, translucent enamel through which the yellow color of the dentin is visible and grayish teeth having a more opaque enamel.

  7. Kaolinite - Wikipedia

    en.wikipedia.org/wiki/Kaolinite

    Kaolinite (/ ˈ k eɪ. ə l ə ˌ n aɪ t,-l ɪ-/ KAY-ə-lə-nyte, -⁠lih-; also called kaolin) [5] [6] [7] is a clay mineral, with the chemical composition Al 2 Si 2 O 5 4.It is a layered silicate mineral, with one tetrahedral sheet of silica (SiO 4) linked through oxygen atoms to one octahedral sheet of alumina (AlO 6).

  8. Andradite - Wikipedia

    en.wikipedia.org/wiki/Andradite

    Andradite is a mineral species of the garnet group.It is a nesosilicate, with formula Ca 3 Fe 2 Si 3 O 12.. Andradite includes three varieties: Colophonite: a historical variety found in the Scandinavian islands, brownish or reddish in color, often opaque or translucent.

  9. Annabergite - Wikipedia

    en.wikipedia.org/wiki/Annabergite

    It most commonly occurs as microcristalline coatings, soft earthy masses and encrustations. Well developed crystals are relatively rare and usually remain minute and capillary. The color of Annabergite varies shades of green. The presence of Cobalt modifies the color towards grey, samples high in cobalt showing a rose red color. [3]

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