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  2. Labradorite - Wikipedia

    en.wikipedia.org/wiki/Labradorite

    Labradorite ((Ca, Na)(Al, Si) 4 O 8) is a calcium-enriched feldspar mineral first identified in Labrador, Canada, which can display an iridescent effect . Labradorite is an intermediate to calcic member of the plagioclase series. It has an anorthite percentage (%An) of between 50 and 70. The specific gravity ranges from 2.68 to 2.72.

  3. Plagioclase - Wikipedia

    en.wikipedia.org/wiki/Plagioclase

    Plagioclase displaying cleavage. (unknown scale) In volcanic rocks, fine-grained plagioclase can display a "microlitic" texture of many small crystals. Plagioclase (/ ˈ p l æ dʒ (i) ə ˌ k l eɪ s, ˈ p l eɪ dʒ-,-ˌ k l eɪ z / PLAJ-(ee)-ə-klayss, PLAYJ-, -⁠klayz) [4] is a series of tectosilicate (framework silicate) minerals within the feldspar group.

  4. Sericite - Wikipedia

    en.wikipedia.org/wiki/Sericite

    Sericite in thin section (fine, high birefringence flakes covering other larger minerals) Granite in thin section under cross-polarized light in which feldspar crystals exhibit sericite alteration Staurolite-garnet schist in thin section under cross-polarized light with sericite

  5. Micrographic texture - Wikipedia

    en.wikipedia.org/wiki/Micrographic_texture

    Micrographic differs from graphic granite in being so much finer-grained that the texture can only be seen in a petrographic thin section with a microscope. The feldspar is usually orthoclase, but can also be albite, oligoclase or microcline.

  6. Folk classification - Wikipedia

    en.wikipedia.org/wiki/Folk_classification

    If the abundances of quartz, feldspars and rock fragments indicate that the rock is an arkose, a subarkose or a lithic arkose, one must then normalize the abundance of feldspars to 100% and attempt to identify the relative abundances of K-feldspars to plagioclase in the sample. If there is more plagioclase than there is K-feldspar, the rock is ...

  7. Crystal twinning - Wikipedia

    en.wikipedia.org/wiki/Crystal_twinning

    In the triclinic system, the most commonly twinned crystals are the feldspar minerals plagioclase and microcline. These minerals show the Albite and Pericline Laws. [5] [6] The most common twin operations by crystal system are tabulated below. This list is not exhaustive, particularly for the crystal systems of lowest symmetry, such as the ...

  8. Vet-Approved Home Treatment for Senior Dogs with Arthritis - AOL

    www.aol.com/vet-approved-home-treatment-senior...

    Dr. Mark answers a pet owner's question about a dog with limping and dragging legs. ... Vet-Approved Home Treatment for Senior Dogs with Arthritis. Dr. Mark dos Anjos. December 27, 2024 at 8:05 AM ...

  9. Metamorphism - Wikipedia

    en.wikipedia.org/wiki/Metamorphism

    A cross-polarized thin section image of a garnet-mica-schist from Salangen Municipality, Norway showing the strong strain fabric of schists. The black crystal is garnet, the pink-orange-yellow colored strands are muscovite mica, and the brown crystals are biotite mica. The grey and white crystals are quartz and (limited) feldspar.