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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10504 - Mineralogy

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

Mineralogical Magazine

ISSN

0026-461X

e-ISSN

1610-8167

Svazek periodika

86

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

10

Strana od-do

363-372

Kód UT WoS článku

000799395000001

EID výsledku v databázi Scopus

2-s2.0-85125182803