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《Chinese Journal of Geology(Scientia Geologica Sinica)》 1966-01
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AUTHIGENIC SULPHURIC AND CALCIC GOYAZITE IN THE SEDIMENTARY ROCK

SUN SHU  
Sulphuric and calcic goyazite,occurring as primary sedimentary-diagenitic origin,was collected from the alumophosphate rock and phosphorite of Devonian age in the Lung- menshan geosyncline,Szechuan province.The mineral is white,grey or black in color and isotropic and cryptocrystalline,as nodular or irregular aggregate form.N=1.633-1.636, H=5.7,G=3.152(3.11 calc.),α_0=6.99,c_0=16.62,α_(rh)=6.86.Cell contents Ca_(0.41) Sr_(0.56) Mg_(0.12) Fe_(0.07) Al_(2.78) (PO_4)_(1.42) (SO_4)_(0.58) F_(0.06)(OH)_(5.30)(H_2O)_(0.64)(sample No.Chuan-059) or Ca_(0.43) Sr_(0.55) Mg_(0.31) Fe_(0.12) Al_(2.69) (PO_4)_(1.37) (SO_4)_(0.53) F_(0.20) (OH)_(5.81) (H_2O)_(0.39) (sample No. Chuan-125)in the rhombohedral unit.This mineral exhibits two endothermic peaks at 700℃ and 1095℃ respectively,and sharp exothermic peak at 900℃ in differential thermal analysis. This mineral was found and identified firstly by Duan Qian-lie and others(1964) as a variety of svanbergite—harttite.But the present author considers that it is formed by isomorphous substitution between Ca~(2+) and Sr~(2+),and PO_4~(3-) and SO_4~(2-) in woodhouseite- goyazite-svanbergite series.Using the abbreviations Wh=woodhouseite,Sv=svanbergite, Gz=goyazite for the members of this series,the present mineral can be written as Wh_(38) Sv_(18) Gz_(44)(Chuan-059)or Wh_(42) Sv_(12) Gz_(46)(Chuan-125),and is thus a sulphuric and cal- cic goyazite.The harttite can also be written in Wh_(16) Sv_(49) Gz_(35),containing 1.02% cerium oxide(E.Hussak)and is a low-sulphuric and cerian svanbergite.
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【Co-citations】
Chinese Journal Full-text Database 2 Hits
1 Dongye Maixing Zheng Wenzhong Cao Zuoqi and Wei Zhao (Geological Institute for Chemical Minerals Product, Ministry of Chemical Industry, Zhuozhou, Hebei Province\ 072754);The Qinglongshao and Dashuizha Continental facies phosphorite[J];ACTA SEDIMENTOLOGICA SINICA;1996-04
2 SUN SHU, CHEN QI-YING AND CHEN KAI-HUI;STUDIES ON THE PHOSPHATE ROCKS IN WESTERN SZECHUAN[J];Chinese Journal of Geology;1973-03
【Secondary Citations】
Chinese Journal Full-text Database 1 Hits
1 S.S.Yoh Department of Geology and Geology and Geography.Peking University;SUBDIVISION, ZONATION AND CORRELATION OF THE DEVONIAN FORMATIONS IN LUNGMENSHAN AREA, NORTHWESTERN SZECHUAN.[J];Acta Geological Sinica;1956-04
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