494 



2. Mangan-Orthit. (Partschin). 



(a) = (ROR03)2SiO'' (b) = HO.RO = (MnO, FeO); JIO» = AlO» 



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(ROR03)Si02 HO.(ROR03)Si02 HOROROäSiO^ 



A. Part- ^ ^ Q QO -^ Q 95 q qq 1 q g^ j -g Part- 



schin . . . , gßjjjjj 



3. Cerorthit (gemeiner Orthit). 



(a) =^ (RO R03)2 Si02 (b) = HO.RO < (CeO, LnO, CaO, FeO); 



R03 = (AlO*, FeO*) 

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(R0R03) SiO* HO (R0R03) SiO» HO RO RO^ SiO^HO 



'/«Orthit ^ ^ QQg ^ JQ3 QQg -^ 1 062,130,16 ^^f^J." 



(6a+b) > . . . ! orthit 



'/3 Oithit 1 1 1166 1 103 0,13 1 0,90 1,96 0,25 Orthit 



(öa-l-b) 



4. Kalk-Orthit (Pistazit z. Tb.) 



(a) = (R0R0*)2 Si02 ; (b) = HO.RO <; CaO; RO» =-- (AIO*, FeO») 

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(ROR03)Si02 HO(RORO»jSiO HORORO^SiO^HO 



VsJ^^^^orthit j ^ Qgg 5 1,016 0,053 1 1,74 2,81 0,15 ^^^^f" 



5. Thon-Orthit (Zoisit, Thulit, Whitamit) 



(a) = (ROR03)2Si02 (b) = HO.RO < CaO; RO» < AlO* 



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(R0R03) SiO^HO (RORO') SiO^HO RORO^SiO^HO 



Vfi T^ö"?^^,*'^^* 1 1 0,08 1 0,99 0,07 1 1,94 2,92 0,21 Zoisit 

 (ba-j- b) 



VäTbonorthit ^ ^ ^.^g ^ 1,05 0,14 12,24 3,43 0,45 



II. Epidote X = ROHO 



(a) = (R0R03)2Si02 (b) = ROHO 



1. Mangan -Epidot (Piemontit) 



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(ROR03)Si02HO (R0R03) SiO^HO. RORO^ SiO^HO 



A-Piemon- ^ ^ ^ .^ ^ ^ ^9 q qq j 2,05 3,02 0,00 Piemon- 



tit (a) ' tit 



2. Eisen -Epidot (Bucklandit). 



RO < (Fe.CaO); RO' = (AI O», FeO») 



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(R0R0^)Si02 H0(R0R03) SiO^HO ROROsSiO^HO 



9a+bT^^* ^ 0,95 0.048 1 0,91 0,04 1 1,63 2,38 0,11 ^"5^^^"' 



3. Kalk -Epidot (Pistazit z. Th.) 



RO < CaO; RO» = (A10»,Fe03) 



