Bismuth phosphates from the Sítio do Castelo mine, Folgosinho (Portugal): description and Raman spectroscopy

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00023272%3A_____%2F24%3A10136572" target="_blank" >RIV/00023272:_____/24:10136572 - isvavai.cz</a>

Result on the web

<a href="http://bullmineral.cz/paper/download/355/fulltext" target="_blank" >http://bullmineral.cz/paper/download/355/fulltext</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Bismuth phosphates from the Sítio do Castelo mine, Folgosinho (Portugal): description and Raman spectroscopy

Original language description

Two bismuth phosphates, zaïrite and monoclinic analogue of ximengite, are described from the Sítio do Castelo mine, Folgosinho (Portugal). Zaïrite is known from Folgosinho for a long time, but no analytical data have been published so far. On the studied samples, it forms bright yellow crystals of variable morphology, from tabular to columnar and spindle-shaped crystals. Electron microprobe analysis showed the relative purity of the zaïrite with a minor content of elements typical of plumbogummite group minerals. The empirical formula can be expressed as (Bi0.84Sr0.08Ca0.06Pb0.01)Σ0.99Fe3.07[(PO4)1.91(SO3)0.09]Σ2.00[(OH)6.01F0.09]Σ6.10. The Raman spectrum of zaïrite is dominated by vibrational bands of (PO4)3- and (OH)- units. Monoclinic bismuth orthophosphate, unknown as a mineral species until now, was rarely found as aggregate up to 30 μm in size rimmed by zaïrite. Its empirical formula is (Bi0.97Fe0.04Ca0.02)Σ1.02(PO4)1.00F0.09. The Raman spectrum agrees with published data for the BiPO4 polymorph of SbPO4-type, space group P21/m. The two described bismuth phosphates at the Sítio do Castelo mine were formed by the decomposition of unspecified primary bismuth minerals due to the activity of low-temperature phosphorus-rich solutions.

Czech name

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Czech description

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Type

J_ost - Miscellaneous article in a specialist periodical

CEP classification

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OECD FORD branch

10504 - Mineralogy

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2024

Confidentiality

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

Name of the periodical

Bulletin Mineralogie Petrologie

ISSN

2570-7337

e-ISSN

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Volume of the periodical

32

Issue of the periodical within the volume

2

Country of publishing house

CZ - CZECH REPUBLIC

Number of pages

9

Pages from-to

105-113

UT code for WoS article

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EID of the result in the Scopus database

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