Zirkelite

General Information: Chemical Formula:(Ca,Th,Ce)Zr(Ti,Nb)2O7 Environment:Found with baddeleyite in decompsed magnetite-pyroxenite. Dimorphous with calciobetafite. IMA Status:Approved IMA 1989 Locality:Jacupiranga, San Palo, Brazil.Physical Properties: Cleavage:None Color:black. Density:4.7 Diaphaniety:Subtranslucent to opaque Habits:Pseudo Cubic - Crystals show a cubic outline., Crystalline - Fine - Occurs as well-formed fine sized crystals., Hardness:5.5 - Knife Blade Luster:Resinous Streak:brownish grayMore details...

General Information: Chemical Formula:Ca2Zn(AsO4)2·2(H2O) Composition:(Molecular Weight = 459.41 gm)Calcium 17.45 % CaZinc 14.23 % ZnArsenic 32.62 % AsHydrogen 0.88 % H Oxygen 34.83 % O  Empirical Formula: Ca2Zn(AsO4)2·2(H2O) IMA Status:Approved IMAPhysical Properties: Cleavage:[???] Good Color:colorless or white. Density:3.75 Diaphaniety:Transparent Hardness:3 - Calcite Streak:whiteMore details...

General Information: Chemical Formula:(Ca,Fe,Y,Th)2Fe(Ti,Nb)3Zr2O7 Environment:In sanidinite. IMA Status:Approved IMA Locality:Monte di Procida, Campi Felgrei, Campania, Italy. Name Origin:Named for its composition.Physical Properties: Cleavage:[???] Indistinct Color:dark red or brown. Density:4.7 Diaphaniety:Opaque Habits:Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., , Hardness:5.5 - Knife Blade Luster:Resinous Streak:dark brownMore details...

(Ca,Th,Ce)Zr(Ti,Nb)2O7