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American Mineralogist, Volume 99, pages 625–632, 2014 Mathesiusite, K5(UO2)4(SO4)4(VO5)(H2O)4, a new uranyl vanadate-sulfate from Jáchymov, Czech Republic Jakub Plášil1,*, František VeseloVský2, Jan Hloušek3, radek škoda4, Milan noVák4, -,ěË6(-.25$5-,ěËý(-.$5, PaVel škácHa6 and anatoly V. kasatkin7 1 Institute of Physics ASCR, v.v.i., Na Slovance 2, CZ-182 21, Praha 8, Czech Republic 2 Czech Geological Survey, Geologická 6, CZ-152 00, Praha 5, Czech Republic 3 85RKiþRYêFKNDViUHQ&=3UDKD&]HFK5HSXEOLF  'HSDUWPHQWRI*HRORJLFDO6FLHQFHV)DFXOW\RI6FLHQFH0DVDU\N8QLYHUVLW\.RWOiĜVNi&=%UQR&]HFK5HSXEOLF 5 'HSDUWPHQWRI0LQHUDORJ\DQG3HWURORJ\1DWLRQDO0XVHXP&LUNXVRYi&=3UDKD&]HFK5HSXEOLF 6 0LQLQJ0XVHXP3ĜtEUDPQiP+\QND.OLþN\3ĜtEUDP9,&]HFK5HSXEOLF  92³$OPD]MXYHOLUH[SRUW´2VWR]KHQND6WUHHWEORFN0RVFRZ5XVVLD abstract Mathesiusite, K5 822) 62) 925 +22 DQHZXUDQ\OYDQDGDWHVXOIDWHPLQHUDOIURP-iFK\PRY :HVWHUQ%RKHPLD&]HFK5HSXEOLFRFFXUVRQIUDFWXUHVRIJDQJXHDVVRFLDWHGZLWKDGROISDWHUDLWHVFKRHSLWH þHMNDLWH]LSSHLWHJ\SVXPDQGDQHZXQQDPHG.82262 mineral. It is a secondary mineral formed during post-mining processes. Mathesiusite is tetragonal, space group PnZLWKWKHXQLWFHOOGLPHQVLRQV a   c   cV   c3, and Z = 2. Acicular aggregates of mathesiusite FRQVLVWRISULVPDWLFFU\VWDOVXSWRaȝPORQJDQGVHYHUDOPLFURPHWHUVWKLFN,WLV\HOORZLVKJUHHQ ZLWKDJUHHQLVKZKLWHVWUHDNDQGYLWUHRXVOXVWHU7KH0RKVKDUGQHVVLVa0DWKHVLXVLWHLVEULWWOHZLWKDQ XQHYHQIUDFWXUHDQGSHUIHFWFOHDYDJHRQ^`DQGZHDNHURQ^`7KHFDOFXODWHGGHQVLW\EDVHGRQWKH HPSLULFDOIRUPXODLVJFP30DWKHVLXVLWHLVFRORUOHVVLQIUDJPHQWVXQLD[LDO ± ZLWKȦ    DQGİ   (OHFWURQPLFURSUREHDQDO\VHV DYHUDJHRI SURYLGHG.226239225 823+22 VWUXFWXUH WRWDO DOOLQZW 7KHHPSLULFDOIRUPXOD EDVHGRQ2 DWRPVSIX LV.(U22)(S2) 925 +22 7KHHLJKWVWURQJHVWSRZGHU;UD\GLIIUDFWLRQOLQHV are [dobsLQc hkl) Irel@               DQG  7KHFU\VWDOVWUXFWXUHRIPDWKHVLXVLWHZDVVROYHG IURPVLQJOHFU\VWDO;UD\GLIIUDFWLRQGDWDDQGUH¿QHGWRR1 IRUUHÀHFWLRQVZLWKI!ı I). ,WFRQWDLQVWRSRORJLFDOO\XQLTXHKHWHURSRO\KHGUDOVKHHWVEDVHGRQ> 822) 62) 925)]±FOXVWHUV7KHVH FOXVWHUVDULVHIURPOLQNDJHVEHWZHHQFRUQHUVKDULQJTXDUWHWVRIXUDQ\OSHQWDJRQDOELS\UDPLGVZKLFK GH¿QHDVTXDUHVKDSHGYRLGDWWKHFHQWHUWKDWLVRFFXSLHGE\95+FDWLRQV(DFKSDLURIXUDQ\OSHQWDJRQDO ELS\UDPLGVVKDUHVWZRYHUWLFHVRI62WHWUDKHGUD(DFK62VKDUHVDWKLUGYHUWH[ZLWKDQRWKHUFOXVWHUWR IRUPWKHVKHHWV7KH.+FDWLRQVDUHORFDWHGEHWZHHQWKHVKHHWVWRJHWKHUZLWKDVLQJOH+22JURXS7KH corrugated sheets are stacked perpendicular to c7KHVHKHWHURSRO\KHGUDOVKHHWVDUHVLPLODUWRWKRVHLQ WKHVWUXFWXUHVRIV\QWKHWLFXUDQ\OFKURPDWHV5DPDQVSHFWUDOGDWDDUHSUHVHQWHGFRQ¿UPLQJWKHSUHVHQFH RI822+ 2 62DQGPROHFXODU+22 Keywords: 0DWKHVLXVLWHQHZPLQHUDOXUDQ\OVXOIDWHYDQDGDWHFU\VWDOVWUXFWXUH5DPDQVSHFWURVFRS\R[LGDWLRQ]RQH-iFK\PRY WKHRORJLDQ-RKDQQHV0DWKHVLXV ± DVWXGHQWRIWKHRO ,Q WKH FRXUVH RI VWXG\ RI WKH QHZ PLQHUDO DGROISDWHUDLWH . 82 62 2+ + 2  3OiãLOHWDO ZHGLVFRYHUHGDQ RWKHUQHZXQQDPHGXUDQ\OPLQHUDOWKDWLVFORVHO\DVVRFLDWHGZLWK DGROISDWHUDLWH+HUHZHSURYLGHDGHVFULSWLRQRIWKLVQHZPLQHUDO PDWKHVLXVLWHZKLFKLVDQRWKHUXUDQ\OVXOIDWHIURPWKH-iFK\PRY 82  62  92 + 2 DQGDXQLTXHVWUXFWXUHWRSRORJ\DPRQJNQRZQVWUXFWXUHV RIXUDQ\OPLQHUDOV7KHWRSRORJ\DQGFKHPLFDOFRPSRVLWLRQRI WKHQHZPLQHUDODUHGLVFXVVHGXVLQJWKHERQGYDOHQFHDSSURDFK 7KHQHZPLQHUDOKRQRUVDQHYDQJHOLFDO /XWKHUDQ SULHVWDQG KLVPRVWLPSRUWDQWSLHFHRIZRUNEHLQJ³6DUHSWDRGHU%HUJSRVWLO´ SULQWHGLQ7KHQHZPLQHUDOPDWKHVLXVLWHDQGWKHQDPHKDV EHHQDSSURYHGE\WKH&RPPLVVLRQRQ1HZ0LQHUDOV1RPHQFOD WLRQ ,0$ 7KHKRORW\SHVSHFLPHQLVGHSRVLWHGLQWKH 1DWLRQDO0XVHXPLQ3UDJXHXQGHUWKHFDWDORJQXPEHU33 (PDLOSODVLO#I]XF] ;±'2,KWWSG[GRLRUJDP /XWKHU)URPXQWLOKLVGHDWK0DWKHVLXVOLYHGDQGVHUYHGLQ -iFK\PRYILUVWDVDWHDFKHUDWWKH/DWLQO\FHXPWKHQDVDSDVWRU LQRQHRIWKHILUVWHYDQJHOLFFKXUFKHVLQWKHZRUOG+HSURYLGHG