JAHNSITE-(CaMnMg) CaMnMg2Fe2(PO4)4(OH)2·8H2O (monoclinic) . whiteite group . Micro brownish xls on rock . Custer County, South Dakota . 本礦晶體發育良好，細小扁平柱狀，晶面有縱狀條紋．紅棕色半透明玻璃光澤 ，硬度４，好發於偉晶花崗岩中．為罕見之礦．

經典名礦欣賞
NO.450