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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 - Wikipedia

    en.wikipedia.org/wiki/Acicular

    In mineralogy: Acicular (crystal habit) refers to a needle-like crystal form; Acicular ferrite, a microstructure of ferrite in steel This page was last edited on 27 ...

  4. Acicular (crystal habit) - Wikipedia

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

    Crystals with this habit tend to be fragile. Complete, undamaged acicular specimens are uncommon. Needle-shaped acicular millerite crystals on white quartz. The term "acicular" derives from the Late Latin "acicula" meaning "little needle". [1] Strictly speaking, the word refers to a growth habit that is slender and tapering to a point.

  5. Garnet - Wikipedia

    en.wikipedia.org/wiki/Garnet

    Garnets are most often found in the dodecahedral crystal habit, but are also commonly found in the trapezohedron habit as well as the hexoctahedral habit. [3] They crystallize in the cubic system, having three axes that are all of equal length and perpendicular to each other, but are never actually cubic because, despite being isometric, the ...

  6. Category:Mineral habits - Wikipedia

    en.wikipedia.org/wiki/Category:Mineral_habits

    In mineralogy a mineral habit is the characteristic external form or appearance of a mineral. Several examples of mineral habits are: prismatic , dentric, bladed, acicular, massive, and reniform. Pages in category "Mineral habits"

  7. Asterism (gemology) - Wikipedia

    en.wikipedia.org/wiki/Asterism_(gemology)

    Asterism is generated by reflections of light from twin-lamellae or from extremely fine needle-shaped acicular inclusions within the stone's crystal structure. [1] A common cause is oriented sub-microscopic crystals of rutile within the gem mineral. It occurs in rubies, sapphires, garnet, diopside, and spinel when a cabochon is cut from a ...

  8. Millerite - Wikipedia

    en.wikipedia.org/wiki/Millerite

    Millerite is a common metamorphic mineral replacing pentlandite within serpentinite ultramafics.It is formed in this way by removal of sulfur from pentlandite or other nickeliferous sulfide minerals during metamorphism or metasomatism.

  9. Hanksite - Wikipedia

    en.wikipedia.org/wiki/Hanksite

    Crystal system: Hexagonal: Crystal class: Dipyramidal (6/m) H–M symbol: (6/m) Space group: P6 3 /m: Unit cell: a = 10.465(21) Å c = 21.191(43) Å; Z = 2: Identification; Color: Colorless to pale yellow, may be grayish green due to clay inclusions: Crystal habit: Occurs as short prismatic to tabular hexagonal crystals: Cleavage: Good on {0001 ...