ISSN
print 2570-7337
online 2570-7345
A study of secondary phosphates with allanpringite and tvrdýite from the abandoned iron deposit Krušná hora near Beroun (Czech Republic)
Keywords
Abstract
During the revision of old localities represented by historical samples in the mineralogical collection of the National Museum in Prague an interesting association of phosphate minerals in iron ores from abandoned iron deposit Krušná hora in Central Bohemia was discovered. The locality Krušná hora is situated about 12 km NW of Beroun (30 km WSW of Prague, Czech Republic) in an area of the Ordovician sedimentary rocks of the Teplá-Barrandian unit. Phosphates are bound to cracks and cavities in iron ores (mainly hematite). Most frequently observed phosphate minerals are: variscite and strengite, which occur there as white to transparent concentric aggregates up to 2 mm in size; fluorwavellite which forms white needle crystals up to 4 mm with contents of F up to 1.33 apfu and yellow to orange cacoxenite which occurs there as radial and concentric aggregates up to 1.5 mm in size with content of Al up to 5.80 apfu. Rarer phosphosiderite forms white to creamy altered radial aggregates up to 15 mm in size and spherical aggregates up to 1 mm in size, with content of Al (metavariscite component) up to 0.18 apfu. An extremely rare allanpringite forms there yellow powder and earthy aggregates in association with fluorwavellite; its empirical formula is (Fe2.80Al0.08)Σ2.89(PO4)2(OH)2.67·5H2O and refined unit-cell parameters are a 9.778(2), b 7.352(3), c 17.883(4) Å, β 92.17(4)° and V 1281.1(7) Å3. Tvrdýite - a rare phosphate from beraunite group - was identified there, it forms green to yellow-green radial aggregates up to 4 mm in size in association with younger earthy yellow-orange jarosite; its empirical formula is (Fe2+0.99Mg2+0.01)Σ1.00(Fe3+)Σ2.00 (Al2.18Fe3+0.68)Σ2.86(PO4)4.00(OH)4.57(OH2)4·2H2O. Phosphate minerals assemblage of the iron sedimentary deposit Krušná hora near Beroun is unique due to occurrence of rare allanpringite and tvrdýite; increased Al contents in phosphate minerals from iron deposits are also remarkable.
Files
References
Bořický E (1869a) O nerostech, v pásmu železných rud silurských se objevujících. Živa 2: 3-22
Bořický E (1869b) Zur Entwicklungsgeschichte der in dem Schichtencomplex der silurischen Eisensteinlager Böhmen’s vorkommenden Minerale. Sitz-Ber K Akad Wiss math-naturwiss 59: 589-620
Bořický E (1871) Verzeichniss der in dem Schichtencomplexe der silurischen Eisensteinlager Böhmens vorkommenden Minerale. Lotos 21: 155-165
Breithaupt JFA (1841) Beraunit. In Vollständige Charakteristik des Mineral-Systems, Arnoldische Buchhandlung (Dresden und Leipzig) 136
Černý P, Černý P, Vrtiška L, Malíková R, Exnar P (2015) Jarosit a doprovodné minerály z opuštěného lomu Milina u Zaječova (Česká republika). Bull mineral-petrolog Odd Nár Muz 24(2): 242-246
Fanfani L, Zanazzi PF (1966) La struttura cristallina della metastrengite. Atti della Accademia Nazionale dei Lincei, Classe di Scienze Fisiche, Matematiche e Naturali, Rendiconti Serie 8(40): 889
Feistmantel K. (1852) Vereinsangelegenheiten - Versammlung am 19. November. Lotos 2: 235
Feistmantel K. (1853) Beitrag zur Kenntniss dem Gegend von Kruschna Hora. Lotos 3: 135
Chukanov NV, Aksenov SM, Rastsvetaeva RK, Schäfer C, Pekov IV, Belakovskiy DI, Scholz R, de Oliveira LCA, Britvin SN (2017a) Eleonorite, Fe3+6(PO4)4O(OH)4·6H2O: validation as a mineral species and new data. Mineral Mag 81: 61-76
Chukanov NV, Pekov IV, Grey IE, Price JR, Britvin SN, Krzhizhanovskaya MG, Kampf AR, Dünkel B, Keck E, Belakovskiy DI, MacRae CM (2017b) Zincoberaunite, ZnFe3+5(PO4)4(OH5)·6H2O, a new mineral from the Hagendorf South pegmatite, Germany. Miner Petrol, 111: 351-361
Kampf AR, Adams PM, Barwood H, Nash BP (2015) Fluorwavellite, IMA 2015-077. CNMNC Newsletter 28, 1862; Mineral Mag 79: 1859-1864
Kampf AR, Adams PM, Barwood H, Nash BP (2017) Fluorwavellite, Al3(PO4)2(OH)2F·5H2O, the fluorine analogue of wavellite. Am Mineral 102: 909-915
Kolitsch U, Bernhardt HJ, Lengauer CL, Blass G, Tillmanns E (2006) Allanpringite, Fe3(PO4)2(OH)3.5H2O, a new ferric iron phosphate from Germany, and its close relation to wavellite. Eur J Mineral 18: 793-801
Laugier J, Bochu B (2011) LMGP-Suite of Programs for the interpretation of X-ray experiments. http://www.ccp14.ac.uk/tutorial/lmgp. přístup duben 2011
Lipold MV (1863) Die Eisensteinlager der silurischen Grauwackenformation in Böhmen. Jahrb der k k geol Reichsanst (Wien) 13(3): 339-448
Mencl J, Farka O, Hrabák J, Koutný J, Kult M, Mareš V, Mencl J, Mynář P, Provázek V, Tomsa F, Webr B, Wiktora E, Zástěra C (1988) Železnorudný důl Krušná hora - historie a současnost. Vydavateľstvo Osveta, Martin, 1-149
Moore PB, Shen J (1983) X-ray structural study of cacoxenite, a mineral phosphate. Nature 306: 356-358
Nič M (2011) Železné rudy Krušné hory - historie dobývání železných rud na Krušné hoře. Bakalářská práce, Univerzita Karlova, Praha 1-54
Orlov A (1929) Wavellit od Černovic u Tábora a jeho paragenese. Rozpr Čes Akad, II tř 39(38): 1-39
Pauliš P, Venclík V, Malíková R, Pour O, Sejkora J (2015) Fosfosiderit ze Zdechovic a Chvaletic u Přelouče v Železných horách (Česká republika). Bull mineral-petrolog Odd Nár Muz (Praha) 23(2): 208-213
Pouchou JL, Pichoir F (1985) “PAP” (φρZ) procedure for improved quantitative microanalysis. In: Microbeam Analysis (J T Armstrong, ed.) 104-106, San Francisco Press, San Francisco
Salvador PS, Fayos J (1972) Some aspects of the structural relationship between “Messbach-type” and “Lucin-type” variscites. Am Mineral 57: 36-44
Sato E,Nakai I, Miyawaki R, Matsubara S. (2009) Crystal structures of alunite family minerals: beaverite, corkite, alunite, natroalunite, jarosite, svanbergite and woodhouseite. N Jahrb Mineral, Abh 185(3): 313-322
Sejkora J, Cícha J, Jebavá I (2011) Minerální asociace fosfátů z Čížové u Písku (Česká republika). Bull mineral-petrolog Odd Nár Muz (Praha) 19(1): 1-26
Sejkora J, Grey IE, Kampf AR, Price JR, Čejka J (2016) Tvrdýite, Fe2+Fe23+Al3(PO4)4(OH)5(OH2)4·2H2O, a new phosphate mineral from Krásno near Horní Slavkov, Czech Republic. Mineral Mag 80(6): 1077-1088
Sejkora J, Škoda R, Ondruš P, Beran P, Süsser C (2006) Mineralogy of phosphate accumulations in the Huber Stock, Krásno ore district, Slavkovský les area, Czech Republic. J Czech Geol Soc 51(1-2): 103-147
Slavíková L, Slavík F (1917-1918) Studie o železných rudách českého spodního siluru. Rozpr Čes ak tř II, 26.
Taxer K, Bartl H (2004) On the dimorphy between the variscite and clinovariscite group: refined finestructural relationship of strengite and clinostrengite, Fe(PO4).2H2O. Crystal Research Technol 39: 1080-1088
Velebil D. (2017) Výskyty barytu na ložiscích sedimentární železné rudy ordovického stáří v oblasti Barrandienu. Minerál 25(5): 443-451
Vrtiška L, Loun J, Malíková R, Sejkora J (2016a) Fluorwavellit a variscit z Počepic u Sedlčan (Česká republika). Bull mineral-petrolog Odd Nár Muz (Praha) 24(2): 285-297
Vrtiška L, Malíková R, Sejkora J (2016b) Zajímavý výskyt fosfátů v okolí Líštěnce u Votic (Česká republika). Bull mineral-petrolog Odd Nár Muz (Praha) 24(1): 114-131
Vrtiška L, Sejkora J, Malíková R, Kadlec T (2017) Revize a nové nálezy fosfátů na historickém nalezišti Černovice u Tábora (Česká republika). Bull Mineral Petrolog 25(2): 277-305
Vrtiška L, Tvrdý J, Malíková R, Dolníček Z (2019) Manganem bohatý beraunit, strunzit a fosfosiderit z historického ložiska Fe-Mn rud Morašice u Přelouče (Česká republika). Bull Mineral Petrolog 27(2): 269-278.
Vtělenský J. (1959) Mineralogie oolitických železných rud z některých ložisek Barrandienu. Geotechnica 26: 1-71
Weiß S, Hochleitner R. (2017) Neue Mineralien aus Hagendorf. Lapis 42(9): 42-46