• Johnwalkite Mineral Data

    webmineral.com/data/Johnwalkite.shtml PE Johnwalkite = 70.30 barns/electron U=PE Johnwalkite x r electron = 229.33 barns/cc. Radioactivity: GRapi = 101.29 (Gamma Ray American Petroleum Institute Units) Concentration of Johnwalkite per GRapi unit = 0.99 (%) Estimated Radioactivity from Johnwalkite - barely detectable : Johnwalkite Classification
  • Johnwalkite dictionary definition | johnwalkite defined

    www.yourdictionary.com/johnwalkite johnwalkite definition: Noun 1. (mineralogy) An orthorhombic-pyramidal mineral containing hydrogen, iron, magnesium, manganese, niobium, oxygen, phosphorus, potassium ...
  • Johnwalkite mineral information and data

    www.dakotamatrix.com/mineralpedia/5568/johnwalkite Johnwalkite is a rare mineral that can be found only here in the Black Hills of South Dakota in the Expectation pegmatite at the Champion mine, near Keystone. It is “a rare secondary mineral derived from the dissolution of triphyllite-lithiophilite and columbite-tantalite in a complex granite pegmatite.
  • Johnwalkite - Handbook of Mineralogy

    www.handbookofmineralogy.com/pdfs/johnwalkite.pdf Johnwalkite Crystal Data: Orthorhombic. Point Group: mm2. Asprismatic crystals, to6mm, elongated along [010]andflattened on{00l}; formsinclude {00l}, {100},{111},{110 ...
  • Johnwalkite Mineral Data

    webmin.mindat.org/data/Johnwalkite.shtml Johnwalkite Crystallography: Axial Ratios: a:b:c =0.7498:1:0.6487 : Cell Dimensions: a = 7.516, b = 10.023, c = 6.502, Z = 2; V = 489.81 Den(Calc)= 3.26
  • johnwalkite - Wiktionary

    en.wiktionary.org/wiki/johnwalkite (mineralogy) An orthorhombic-pyramidal mineral containing hydrogen, iron, magnesium, manganese, niobium, oxygen, phosphorus, potassium, and tantalum
  • Johnwalkite Mineral Specimen For Sale - Dakota Matrix Minerals

    www.dakotamatrix.com/products/17302/johnwalkite Johnwalkite - A dark red-brown crystal chip of about 0.5mm in capsule. Extremey rare. Taken from the Co-Type. . This and many more mineral specimens are available for sale at Dakota Matrix Minerals.
  • Johnwalkite

    www.mindat.org/photo-143682.html Johnwalkite: K(Mn 2+,Fe 2+,Fe 3+) 2 (Nb 5+,Ta 5+)(PO 4) 2 O 2 ·2(H 2 O,OH) Champion Mine, Keystone, Keystone Mining District, Pennington Co., South Dakota, USA. How to use the mindat.org media viewer. Click/touch this help panel to close it. Welcome to the mindat.org media viewer. Here is a quick guide to some of the options available to you.
  • Verification

    www.mindat.org/min-2108.html Large number of pages viewed. While we don't want to limit you viewing as many pages as you would like on mindat.org, we do need to prevent people from automated downloads of our content.
  • Phosphate mineral - Wikipedia

    en.wikipedia.org/wiki/Phosphate_minerals Phosphate minerals contain the tetrahedrally coordinated phosphate (PO 4 3−) anion along sometimes with arsenate (AsO 4 3−) and vanadate (VO 4 3−) substitutions. Chlorine (Cl −), fluorine (F −), and hydroxide (OH −) anions that also fit into the crystal structure.. The phosphate class of minerals is a large and diverse group, however, only a few species are relatively common.