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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

    Aquamarine (medium): clear / light blue, or light blue / dark blue Alexandrite (strong): dark red-purple / orange / green Apatite (strong): blue-yellow / blue-colorless

  4. 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 ... Light blue Glaucophane: Monoclinic: Biaxial (-) 0.021: Pleochroic blue Microcline:

  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. 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]

  7. Telltale Signs You Need to See a Doctor for Your Cough - AOL

    www.aol.com/telltale-signs-see-doctor-cough...

    The odds are high you’ve had a cough before in your life, but each time can throw you for a loop. Even though you’ve been through this, it can be hard to know when to see a doctor for a cough ...

  8. ‘Nobody has seen it before’: Arsenal held to 1-1 draw at ...

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    Letting slip a 1-0 lead and securing only a draw dealt a blow to Arsenal’s Premier League title hopes as the Gunners now sit five points behind league leader Liverpool, which has two games in hand.

  9. Lapis lazuli - Wikipedia

    en.wikipedia.org/wiki/Lapis_Lazuli

    Lapis lazuli (UK: / ˌ l æ p ɪ s ˈ l æ z (j) ʊ l i, ˈ l æ ʒ ʊ-,-ˌ l i /; US: / ˈ l æ z (j) ə l i, ˈ l æ ʒ ə-,-ˌ l i /), or lapis for short, is a deep-blue metamorphic rock used as a semi-precious stone that has been prized since antiquity for its intense color.

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