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  2. Apatite - Wikipedia

    en.wikipedia.org/wiki/Apatite

    Apatite is a group of phosphate minerals, usually hydroxyapatite, fluorapatite and chlorapatite, with high concentrations of OH −, F − and Cl − ion, respectively, in the crystal. The formula of the admixture of the three most common endmembers is written as Ca 10 ( PO 4 ) 6 (OH,F,Cl) 2 , and the crystal unit cell formulae of the ...

  3. National Register of Historic Places listings in Ohio

    en.wikipedia.org/wiki/National_Register_of...

    Ohio counties (clickable map) This is a list of properties and districts in Ohio that are listed on the National Register of Historic Places. There are over 4,000 in total. Of these, 73 are National Historic Landmarks. There are listings in each of Ohio's 88 counties.

  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 Birefringence Color in plain polars Anorthite: Triclinic: Biaxial (-) 0.013

  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. National Register of Historic Places listings in Clark County ...

    en.wikipedia.org/wiki/National_Register_of...

    This is intended to be a complete list of the properties and districts on the National Register of Historic Places in Clark County, Ohio, United States. The locations of National Register properties and districts for which the latitude and longitude coordinates are included below, may be seen in an online map.

  7. National Register of Historic Places listings in Lucas County ...

    en.wikipedia.org/wiki/National_Register_of...

    The locations of National Register properties and districts for which the latitude and longitude coordinates are included below, may be seen in an online map. [1] There are 100 properties and districts listed on the National Register in the county, including 2 National Historic Landmarks. Another 6 properties were once listed but have been removed.

  8. Fluorapatite - Wikipedia

    en.wikipedia.org/wiki/Fluorapatite

    Fluorapatite crystallizes in a hexagonal crystal system. It is often combined as a solid solution with hydroxylapatite (Ca 5 (PO 4) 3 OH or Ca 10 (PO 4) 6 (OH) 2) in biological matrices. Chlorapatite (Ca 5 (PO 4) 3 Cl) is another related structure. [5] Industrially, the mineral is an important source of both phosphoric and hydrofluoric acids.

  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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