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  2. Chelsea boot - Wikipedia

    en.wikipedia.org/wiki/Chelsea_boot

    Chelsea boots in black calf leather. Chelsea boots are close-fitting, ankle-length boots with elastic side panels, a low heel and a snug fit around the ankle. They often have a loop or tab of fabric on the back of the boot, enabling the boot to be pulled on. The boot dates back to the Victorian era, when it was worn by both men and women. [1]

  3. Chalcanthite - Wikipedia

    en.wikipedia.org/wiki/Chalcanthite

    Chalcanthite on limonite from Washington Camp, Santa Cruz County, Arizona (size: 5.5 x 2.9 x 1.5 cm) As chalcanthite is a copper mineral, it can be used as an ore of copper. However, its ready solubility in water means that it tends to crystallize, dissolve, and recrystallize as crusts over any mine surface in more humid regions. Therefore ...

  4. Ultramarine - Wikipedia

    en.wikipedia.org/wiki/Ultramarine

    [30] Natural ultramarine is a difficult pigment to grind by hand, and for all except the highest quality of mineral, sheer grinding and washing produces only a pale grayish blue powder. [ 31 ] The pigment was most extensively used during the 14th through 15th centuries, as its brilliance complemented the vermilion and gold of illuminated ...

  5. Benitoite - Wikipedia

    en.wikipedia.org/wiki/Benitoite

    Benitoite (/ b ə ˈ n iː t oʊ aɪ t /) is a rare blue barium titanium cyclosilicate mineral, found in hydrothermally altered serpentinite. It forms in low temperature, high pressure environments typical of subduction zones at convergent plate boundaries. Benitoite fluoresces under short wave ultraviolet light, appearing bright blue to bluish ...

  6. Blue pigments - Wikipedia

    en.wikipedia.org/wiki/Blue_pigments

    Copper phthalocyanine ("phthalo blue") is a synthetic blue pigment frequently used in paints, inks, and dyes. It is highly valued for its superior properties such as light fastness, tinting strength, covering power and resistance to the effects of alkalis and acids. It has the appearance of a blue powder, insoluble in most solvents including ...

  7. Elbaite - Wikipedia

    en.wikipedia.org/wiki/Elbaite

    Elbaite, a sodium, lithium, aluminium boro-silicate, with the chemical composition Na(Li 1.5 Al 1.5)Al 6 Si 6 O 18 (BO 3) 3 (OH) 4, [4] is a mineral species belonging to the six-member ring cyclosilicate tourmaline group. Elbaite forms three series, with dravite, with fluor-liddicoatite, and with schorl.