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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. Fractional crystallization (geology) - Wikipedia

    en.wikipedia.org/wiki/Fractional_crystallization...

    In some compositions, at high pressures without water crystallization of enstatite is favored, but in the presence of water at high pressures, olivine is favored. [12] Granitic magmas provide additional examples of how melts of generally similar composition and temperature, but at different pressure, may crystallize different minerals.

  4. Civil Services Examination - Wikipedia

    en.wikipedia.org/wiki/Civil_Services_Examination

    This is an accepted version of this page This is the latest accepted revision, reviewed on 17 January 2025. Civil services examination in India This article is about the examination in India. For civil service examinations in general, see civil service entrance examination. This article may need to be rewritten to comply with Wikipedia's quality standards. You can help. The talk page may ...

  5. Euhedral and anhedral - Wikipedia

    en.wikipedia.org/wiki/Euhedral_and_anhedral

    Crystals that grow from cooling liquid magma typically do not form smooth faces or sharp crystal outlines. As magma cools, the crystals grow and eventually touch each other, preventing crystal faces from forming properly or at all. When snowflakes crystallize, they do not touch each other. Thus, snowflakes form euhedral, six-sided twinned crystals.

  6. Category:Minerals by crystal system - Wikipedia

    en.wikipedia.org/wiki/Category:Minerals_by...

    Main menu. Main menu. move to sidebar hide. ... Category: Minerals by crystal system. 25 languages. ... Download as PDF; Printable version;

  7. Fractional crystallization (chemistry) - Wikipedia

    en.wikipedia.org/wiki/Fractional_crystallization...

    In chemistry, fractional crystallization is a stage-wise separation technique that relies on the liquid–solid phase change. This technique fractionates via differences in crystallization temperature and enables the purification of multi-component mixtures, as long as none of the constituents can act as solvents to the others.

  8. Crystal system - Wikipedia

    en.wikipedia.org/wiki/Crystal_system

    Crystal systems that have space groups assigned to a common lattice system are combined into a crystal family. The seven crystal systems are triclinic, monoclinic, orthorhombic, tetragonal, trigonal, hexagonal, and cubic. Informally, two crystals are in the same crystal system if they have similar symmetries (though there are many exceptions).

  9. Portal:Minerals - Wikipedia

    en.wikipedia.org/wiki/Portal:Minerals

    Crystal systems that have space groups assigned to a common lattice system are combined into a crystal family. The seven crystal systems are triclinic, monoclinic, orthorhombic, tetragonal, trigonal, hexagonal, and cubic. Informally, two crystals are in the same crystal system if they have similar symmetries (though there are many exceptions).