Mineralogy Database

Hellandite-(Ce) Mineral Data

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General Hellandite-(Ce) Information

Help on Chemical  Formula: Chemical Formula: (Ca3REE)4Ce2Al[ ]2[Si4 B4O22](OH)2
Help on Composition: Composition: Molecular Weight = 1,114.02 gm
   Calcium          10.79 %  Ca   15.10 % CaO
   Cerium           25.15 %  Ce   29.46 % Ce2O3
   La,Ce,Pr,Nd,Sm,  12.93 %  RE   15.08 % REE2O3
   Aluminum          2.42 %  Al    4.58 % Al2O3
   Silicon          10.08 %  Si   21.57 % SiO2
   Boron             3.88 %  B    12.50 % B2O3
   Hydrogen          0.14 %  H     1.21 % H2O
   Oxygen           33.75 %  O
   Fluorine          0.85 %  F     0.85 % F
                      -   %   F    -0.36 % -O=F2    
                   ______        ______ 
                   100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca3REECe2AlSi4B4O22(OH)1.5F0.5
Help on Environment: Environment: Occurs in miarolitic cavities in a volcanic ejectum within an explosive breccia. (hellandite group; structure)
Help on IMA Status: IMA Status: Approved IMA 2001 (Dana # Added)
Help on Locality: Locality: Pyroclastic flow unit (ignibrite "C") of the Vico volcanic complex near Capranica (Viterbo Province), north of Rome, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Amund Theodor Helland (1846-1918), geologist of Oslo, Norway.
Help on Name Pronunciation: Name Pronunciation: Hellandite-(Ce) + Pronunciation Say HELLANDITE-(CE)
Help on Synonym: Synonym: IMA2000-F