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  2. Phyllite - Wikipedia

    en.wikipedia.org/wiki/Phyllite

    Phyllite Photomicrograph of thin section of phyllite (in cross polarised light) Fractured Duke stone showing phyllitic texture Phyllite. Phyllite (/ ˈ f ɪ l aɪ t / FIL-yte) is a type of foliated metamorphic rock formed from slate that is further metamorphosed so that very fine grained white mica achieves a preferred orientation. [1]

  3. Quartzite - Wikipedia

    en.wikipedia.org/wiki/Quartzite

    Quartzite can have a grainy, glassy, sandpaper-like surface. Quartzite is a hard, non-foliated metamorphic rock which was originally pure quartz sandstone. [1] [2] Sandstone is converted into quartzite through heating and pressure usually related to tectonic compression within orogenic belts.

  4. List of RAL colours - Wikipedia

    en.wikipedia.org/wiki/List_of_RAL_colours

    Ultramarine blue: RAL 5003: Sapphire blue: RAL 5004: Black blue: RAL 5005: Signal blue: RAL 5007: Brilliant blue: RAL 5008: Grey blue: RAL 5009: Azure blue: RAL 5010: Gentian blue: U8 line of the Berlin U-Bahn: RAL 5011: Steel blue: RAL 5012: Light blue: U7 line of the Berlin U-Bahn: RAL 5013: Cobalt blue: Deutsche Bundesbahn express ...

  5. Slate - Wikipedia

    en.wikipedia.org/wiki/Slate

    Some of the slate from Wales and Cumbria is colored slate (non-blue): purple and formerly green in Wales and green in Cumbria. In North America, slate is produced in Newfoundland, eastern Pennsylvania, Buckingham County, Virginia, and the Slate Valley region in Vermont and New York, where colored slate is mined in the Granville, New York, area

  6. Bharal - Wikipedia

    en.wikipedia.org/wiki/Bharal

    The dwarf blue sheep or dwarf bharal (formerly described as Pseudois schaeferi), also known as rong-na in Tibetan, was an alleged species of Pseudois endemic to Sichuan-Tibet in China. It apparently inhabited low, arid, grassy slopes of the upper Yangtze gorge in Batang County of the Sichuan Province , and a small part of the Tibet Autonomous ...

  7. Jasper - Wikipedia

    en.wikipedia.org/wiki/Jasper

    Jasper, an aggregate of microgranular quartz and/or cryptocrystalline chalcedony and other mineral phases, [1] [2] is an opaque, [3] impure variety of silica, usually red, yellow, brown or green in color; and rarely blue.