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  2. Crystal habit - Wikipedia

    en.wikipedia.org/wiki/Crystal_habit

    In mineralogy, crystal habit is the characteristic external shape of an individual crystal or aggregate of crystals. The habit of a crystal is dependent on its crystallographic form and growth conditions, which generally creates irregularities due to limited space in the crystallizing medium (commonly in rocks ).

  3. Acicular (crystal habit) - Wikipedia

    en.wikipedia.org/wiki/Acicular_(crystal_habit)

    Strictly speaking, the word refers to a growth habit that is slender and tapering to a point. Prismatic crystals are not acicular; however, colloquial usage has altered the commonly understood meaning of the word. When writing for mineralogical publications, authors should restrict their usage of "acicular" to crystals with the tapering growth ...

  4. Botryoidal - Wikipedia

    en.wikipedia.org/wiki/Botryoidal

    Minerals take on a botryoidal habit when they form in an environment containing many nuclei, specks of sand, dust, or other particulate matter to serve as sources of crystal nucleation. Acicular or fibrous crystals grow outward from these "seeds" at the same or very similar rate, resulting in radial crystal growth. As these spheres grow, they ...

  5. Crystal - Wikipedia

    en.wikipedia.org/wiki/Crystal

    All the forms of the isometric system are closed, while all the forms of the monoclinic and triclinic crystal systems are open. A crystal's faces may all belong to the same closed form, or they may be a combination of multiple open or closed forms. [11] A crystal's habit is its visible external shape.

  6. Selenite (mineral) - Wikipedia

    en.wikipedia.org/wiki/Selenite_(mineral)

    Selenite, satin spar, desert rose, and gypsum flower are crystal habit varieties of the mineral gypsum.. All varieties of gypsum, including selenite and alabaster, are composed of calcium sulfate dihydrate (meaning that it has two molecules of water), with the chemical formula CaSO 4 ·2H 2 O. Selenite contains no significant selenium – The similar names both derive from Greek selḗnē ...

  7. Sphalerite - Wikipedia

    en.wikipedia.org/wiki/Sphalerite

    Crystal habit: Euhedral crystals – occurs as well-formed crystals showing good external form. Granular – generally occurs as anhedral to subhedral crystals in matrix. Twinning: Simple contact twins or complex lamellar forms, twin axis [111] Cleavage: perfect dodecahedral on [011] Fracture: Uneven to conchoidal: Mohs scale hardness: 3.5–4 ...

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  9. 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.