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  2. Apatite - Wikipedia

    en.wikipedia.org/wiki/Apatite

    Apatite is the defining mineral for 5 on the Mohs scale. [11] It can be distinguished in the field from beryl and tourmaline by its relative softness. It is often fluorescent under ultraviolet light. [12] Apatite is one of a few minerals produced and used by biological micro-environmental systems. [7]

  3. Pleochroism - Wikipedia

    en.wikipedia.org/wiki/Pleochroism

    Another device using this property to identify minerals is the dichroscope. [8] List of pleochroic minerals ... Apatite (strong): blue-yellow / blue-colorless;

  4. Scapolite - Wikipedia

    en.wikipedia.org/wiki/Scapolite

    The analogy is a very close one, and this theory receives much support from the fact that in Canada (at various places in Ottawa and Ontario) there are numerous valuable apatite vein deposits. They lie in basic rocks such as gabbro and pyroxenite , and these in the neighborhood of the veins have been extensively scapolitized, like the spotted ...

  5. List of gemstones by species - Wikipedia

    en.wikipedia.org/wiki/List_of_gemstones_by_species

    Calcite. Manganoan calcite (var.); Caledonite; Canasite; Cancrinite. Vishnevite; Carletonite; Carnallite; Cassiterite; Catapleiite; Cavansite; Celestite; Ceruleite ...

  6. List of minerals by optical properties - Wikipedia

    en.wikipedia.org/wiki/List_of_minerals_by...

    Optical properties of common minerals Name Crystal system Indicatrix Optical sign Birefringence Color in plain polars Anorthite: Triclinic: Biaxial (-) 0.013

  7. Nepheline syenite - Wikipedia

    en.wikipedia.org/wiki/Nepheline_syenite

    Sodalite, colorless and transparent in thin section, but frequently pale blue in the hand specimens, is the principal feldspathoid mineral in addition to nepheline. Reddish-brown to black aenigmatite occurs also in these rocks. Extremely iron-rich olivine is rare, but is present in some nepheline syenite.

  8. 'Dismembered' body of Delaware woman reported missing found ...

    www.aol.com/dismembered-body-delaware-woman...

    A Delaware woman who was reported missing last week after she didn't show up to work for several days was found dismembered in a car over the weekend, police said.

  9. Pegmatite - Wikipedia

    en.wikipedia.org/wiki/Pegmatite

    Rose muscovite from the Harding pegmatite mine Blue apatite crystals at the Harding pegmatite mine. Pegmatites form under conditions in which the rate of new crystal nucleation is much slower than the rate of crystal growth. Large crystals are favored. In normal igneous rocks, coarse texture is a result of slow cooling deep underground. [14]

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