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Ferroberaunite, Fe2+Fe3+5(PO4)4(OH)5·6H2O, a mixed-valence iron member of the beraunite series, from the Gravel Hill mine, Perranzabuloe, Cornwall, UK

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F22%3A00125699" target="_blank" >RIV/00216224:14310/22:00125699 - isvavai.cz</a>

  • Result on the web

    <a href="http://doi.org/10.1180/mgm.2022.15" target="_blank" >http://doi.org/10.1180/mgm.2022.15</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.1180/mgm.2022.15" target="_blank" >10.1180/mgm.2022.15</a>

Alternative languages

  • Result language

    angličtina

  • Original language name

    Ferroberaunite, Fe2+Fe3+5(PO4)4(OH)5·6H2O, a mixed-valence iron member of the beraunite series, from the Gravel Hill mine, Perranzabuloe, Cornwall, UK

  • Original language description

    The new mineral ferroberaunite, Fe2+Fe3+5(PO4)4(OH)5·6H2O (IMA2021–36; symbol: Fbru), occurs in cavities of ‘limonite’ iron ore from the Gravel Hill mine, Perranzabuloe, Cornwall, England, United Kingdom. Its flattened prismatic crystals up to 400 μm long are dark green to olive green, transparent to translucent, with a vitreous lustre, pearly on cleavages. The Mohs hardness is ~3–4. The density measured by the flotation method is 2.94(2) g·cm–3, the calculated density is 2.907 g·cm–3. Ferroberaunite is biaxial (–), with α = 1.736(2), β = 1.765(3), γ = 1.786(5) at 589 nm, 2Vmeas. = 68(3)°, 2Vcalc. = 79°; dispersion of optical axes is strong, r &gt; v; orientation is Y = b; X ≈ a, Z ≈ c. Pleochroism is strong: X = bluish-green &gt;&gt; Z = green &gt; Y = yellow. Electron-microprobe analyses gave the empirical formula (Fe2+0.75Ca0.01Mn0.02Fe3+0.22)Σ1.00(Fe3+4.88Al0.04)Σ4.92(PO4)4O0.11(OH)4.76·6H2O. Ferroberaunite is monoclinic, C2/c, with a = 20.8708(3), b = 5.1590(8), c = 19.2263(3) Å, β = 93.3186(17)°, V = 2066.7(3) Å3 and Z = 4. The eight strongest lines in the powder X-ray diffraction pattern are [dmeas/Å (Irel. %) (hkl)]: 10.410 (100) (200), 9.606 (14) (002), 7.271 (11) (202 ̅), 5.203 (4) (400), 3.467 (12) (600), 3.325 (6) (602 ̅), 3.201 (6) (006), 2.600 (4) (800). The mineral is isostructural with beraunite, redefined recently as Fe3+6(PO4)4O(OH)4·6H2O.

  • Czech name

  • Czech description

Classification

  • Type

    J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database

  • CEP classification

  • OECD FORD branch

    10504 - Mineralogy

Result continuities

  • Project

  • Continuities

    S - Specificky vyzkum na vysokych skolach

Others

  • Publication year

    2022

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    Mineralogical Magazine

  • ISSN

    0026-461X

  • e-ISSN

    1610-8167

  • Volume of the periodical

    86

  • Issue of the periodical within the volume

    3

  • Country of publishing house

    GB - UNITED KINGDOM

  • Number of pages

    10

  • Pages from-to

    363-372

  • UT code for WoS article

    000799395000001

  • EID of the result in the Scopus database

    2-s2.0-85125182803