简介:Spacesymmetryofprehnite,whichoccursincavitiesandveinswithinSkarnfromtheTieshanironmineraldeposit,Daye,Hubeiprovince,CentralChina,hasbeendeterminedusingselectedareaelectrondiffraction(SAED)andconvergent-beamelectrondiffraction(CBED)onthesubmicrometerscale.OurresultsconfirmthatthenaturalprehnitemayhavethestructurewithsymmetryPncm.Theunit-cellparametersofinvestigatedprehnite(a=0.458nm,b=0.555nm,andc=1.853nm)havebeencalculatedbyusingthemulticrystaldifiractionringsofgold,theinternalstandard.