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  2. List of mineral tests - Wikipedia

    en.wikipedia.org/wiki/List_of_mineral_tests

    The way a mineral splits (or “cleaves”), particularly along planes in the crystal structure. Cleavage is generally described by. how well a mineral can be split to produce a flat plane, a process controlled by planes of weakness in the crystal structure. the number of distinct directions of these cleavage planes; the angles between those ...

  3. Diorite - Wikipedia

    en.wikipedia.org/wiki/Diorite

    Diorite is an intrusive igneous rock composed principally of the silicate minerals plagioclase feldspar (typically andesine), biotite, hornblende, and sometimes pyroxene.The chemical composition of diorite is intermediate, between that of mafic gabbro and felsic granite.

  4. Pontil mark - Wikipedia

    en.wikipedia.org/wiki/Pontil_mark

    Pontil scar on the base of a free-blown glass bowl. A pontil mark or punt mark is the scar where the pontil, punty or punt was broken from a work of blown glass.The presence of such a scar indicates that a glass bottle or bowl was blown freehand, while the absence of a punt mark suggests either that the mark has been obliterated or that the work was mold-blown.

  5. Fluid inclusion - Wikipedia

    en.wikipedia.org/wiki/Fluid_inclusion

    A fluid inclusion is a bubble of liquid and/or gas that is trapped within a crystal. As minerals often form from a liquid or aqueous medium, tiny bubbles of that liquid can become trapped within the crystal, or along healed crystal fractures. These inclusions usually range in size from 0.01 mm to 1 mm and are only visible in detail by ...

  6. Granodiorite - Wikipedia

    en.wikipedia.org/wiki/Granodiorite

    The name comes from two related rocks to which granodiorite is an intermediate: granite and diorite. The gran-root comes from the Latin grānum for "grain", an English language derivative. Diorite is named after the contrasting colors of the rock.

  7. Ancient crystals reveal the earliest evidence of fresh water ...

    www.aol.com/news/ancient-crystals-reveal...

    Chemical clues in zircon crystals suggest the rock in which they formed came into contact with fresh water 4 billion years ago, when Earth was thought to be covered in ocean.

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