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online 2570-7345

Ferrarisite from the Barbora mine in the Jáchymov ore district (Czech Republic)


Volume 33, issue 1 (2025), pages 128-134
DOI: https://doi.org/10.46861/bmp.33.134

Keywords

Abstract

Very rare hydrated calcium arsenate, mineral ferrarisite, was found in the area of corridor 30-32 (vein No. 32, III. level of the shaft Barbora) of the Jáchymov ore district, Krušné hory Mountains, Czech Republic. Ferrarisite occurs as colourless to greyish white crystalline aggregates up to 5 mm in size or crystalline aggregates formed by parallel arranged acicular crystals up to 1 mm in length. Associated minerals are annabergite, picropharmacolite, pharmacolite, rauenthalite and guérinite. Ferrarisite is triclinic, space group P-1, the unit-cell parameters refined from X-ray powder diffraction data are: a 8.3000(10), b 6.7309(8), c 11.2129(12) Å, α 106.198(8)°, β 92.857(10)°, γ 99.183(9)° and V 590.90(12) Å3. Chemical analyses of ferrarisite correspond to the empirical formula Ca4.99(AsO4)1.93(PO4)0.06(AsO3OH)2.01·9H2O on the basis of As+P = 4 apfu. The origin of ferrarisite is interpreted as product of (sub)recent supergene alteration of primary arsenides in calcite gangue in environment of abandoned mine corridors.

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References

Bari H, Permingeat F, Pierrot R, Walenta K (1980) La ferrarisite Ca5H2(AsO4)4·9 H2O, une nouvelle espèce minérale dimorphe de la guérinite. Bull Minéral 103(5): 533-540

Bureš B (2024) Ferrarisit z uranového ložiska Zálesí u Javorníka v Rychlebských horách (Česká republika). Bull Mineral Petrolog 32(1): 19-22. https://doi.org/10.46861/bmp.32.019

Burnham ChW (1962) Lattice constant refinement. Carnegie Inst Washington Year Book 61: 132-135

Catti M, Ivaldi G (1981) Mechanism of the reaction Ca5 H2(AsO4)4·9H2O (ferrarisite)→ Ca5H2(AsO4)4·5H2O) (dimorph of vladimirite), and structure of the latter phase. Zeit Kristall 157(1-2): 119-130

Catti M, Chiari G, Ferraris G (1980) The structure of ferrarisite, Ca5(HAsO4)2(AsO4)2·9H2O, disorder, hydrogen bonding and polymorphism with guerinite. Bull Minéral 103(5): 541-546

Hloušek J, Plášil J, Sejkora J, Škácha P (2014) Novinky a nové minerály z Jáchymova, (2003 - 2014). Bull mineral-petrolog Odd Nár Muz (Praha) 22: 155-181

Kolektiv (1962) Závěrečná zpráva šachty Barbora, surovina: barevné kovy. MS, Geologický průzkum, n.p. Praha, úsek Jáchymov, P14470, str. 5-21

Majzlan J, Plášil J, Dachs E, Benisek A, Mangold S, Škoda R, Abrosimova N (2021) Prediction and observation of formation of Ca–Mg arsenates in acidic and alkaline fluids: Thermodynamic properties and mineral assemblages at Jáchymov, Czech Republic and Rotgülden, Austria. Chem Geol 559: 119922

Novák F, Pauliš P, Hykš J, Bureš B, Adam M (2004) Guerinit a farmakolit z uranového ložiska Zálesí u Javorníka ve Slezsku. Bull mineral-petrolog Odd Nár Muz (Praha) 12: 140-142

Ondruš P (1993) ZDS - A computer program for analysis of X-ray powder diffraction patterns. Materials Science Forum, 133-136, 297-300, EPDIC-2. Enschede

Ondruš P, Veselovský F, Hloušek J, Skála R, Frýda J, Čejka J, Gabašová A (1997a) Secondary minerals of the Jáchymov (Joachimsthal) ore district. J Czech Geol Soc 42: 3-76

Ondruš P, Veselovský F, Skála R, Císařová I, Hloušek J, Frýda J, Vavřín I, Čejka J, Gabašová A (1997b) New naturally occurring phases of secondary origin from Jáchymov (Joachimsthal). J Czech Geol Soc 42: 77-107

Ondruš P, Veselovský F, Gabašová A, Drábek M, Dobeš P, Malý K, Hloušek J, Sejkora J (2003a) Ore-forming processes and mineral parageneses of the Jáchymov ore district. J Czech Geol Soc 48: 157-192 

Ondruš P, Veselovský F, Gabašová A, Hloušek J, Šrein V (2003b) Geology and hydrothermal vein system of the Jáchymov (Joachimsthal) ore district. J Czech Geol Soc 48: 3-18 

Ondruš P, Veselovský F, Gabašová A, Hloušek J, Šrein V (2003c) Supplement to secondary and rock-forming minerals of the Jáchymov ore district. J Czech Geol Soc 48: 149-155

Ondruš P, Veselovský F, Gabašová A, Hloušek J, Šrein V, Vavřín I, Skála R, Sejkora J, Drábek M (2003d) Primary minerals of the Jáchymov ore district. J Czech Geol Soc 48: 19-147

Pouchou JL, Pichoir F (1985) “PAP” (φρZ) procedure for improved quantitative microanalysis. In: Microbeam Analysis (Armstrong JT, ed.). San Francisco Press, San Francisco: 104-106

Škácha P, Plášil J, Horák V (2019) Jáchymov: mineralogická perla Krušnohoří. Academia, Praha 682 s.

Yvon K, Jeitschko W, Parthé E (1977) Lazy Pulverix, a computer program for calculation X-ray and neutron diffraction powder patterns. J Appl Cryst 10: 73-74. https://doi.org/10.1107/s0021889877012898