Ferroberaunite, Fe2+Fe5+(PO4)(4)(OH)(5)center dot 6H(2)O, a mixed-valence iron member of the beraunite series, from the Gravel Hill mine, Perranzabuloe, Cornwall, England

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15640%2F22%3A73618750" target="_blank" >RIV/61989592:15640/22:73618750 - isvavai.cz</a>

Result on the web

<a href="https://www.cambridge.org/core/journals/mineralogical-magazine/article/ferroberaunite-fe2fe35po44oh56h2o-a-mixedvalence-iron-member-of-the-beraunite-series-from-the-gravel-hill-mine-perranzabuloe-cornwall-england/D8C3CD0261018C56C07D34A8E677FAA7" target="_blank" >https://www.cambridge.org/core/journals/mineralogical-magazine/article/ferroberaunite-fe2fe35po44oh56h2o-a-mixedvalence-iron-member-of-the-beraunite-series-from-the-gravel-hill-mine-perranzabuloe-cornwall-england/D8C3CD0261018C56C07D34A8E677FAA7</a>

DOI - Digital Object Identifier

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

Result language

angličtina

Original language name

Ferroberaunite, Fe2+Fe5+(PO4)(4)(OH)(5)center dot 6H(2)O, a mixed-valence iron member of the beraunite series, from the Gravel Hill mine, Perranzabuloe, Cornwall, England

Original language description

The new mineral ferroberaunite, Fe2+Fe3+5(PO4)4(OH)5·6H2O (IMA2021-36; symbol: Fbru), occurs in cavities of &apos;limonite&apos; iron ore from the Gravel Hill mine, Perranzabuloe, Cornwall, England. Its flattened prismatic crystals up to 400 m 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) (20), 5.203 (4) (400), 3.467 (12) (600), 3.325 (6) (60), 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

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

21002 - Nano-processes (applications on nano-scale); (biomaterials to be 2.9)

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2022

Confidentiality

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

Name of the periodical

MINERALOGICAL MAGAZINE

ISSN

0026-461X

e-ISSN

1471-8022

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