Johnsenite-(Ce) Mineral Data

General Johnsenite-(Ce) Information
Chemical Formula:	Na12(Ce,REE,Sr)3Ca6Mn3Zr3W(Si25O73)(CO3)(OH,Cl)2
Composition:	Molecular Weight = 3,374.09 gm
	Potassium 0.22 % K 0.27 % K₂O
	Sodium 8.00 % Na 10.78 % Na₂O
	Strontium 1.40 % Sr 1.66 % SrO
	Calcium 6.62 % Ca 9.26 % CaO
	Lanthanum 1.36 % La 1.59 % La₂O₃
	Cerium 2.66 % Ce 3.11 % Ce₂O₃
	Praeseodymium 1.00 % Pr 1.17 % Pr₂O₃
	Samarium 0.09 % Sm 0.10 % Sm₂O₃
	Gadolinium 0.28 % Gd 0.32 % Gd₂O₃
	Dysprosium 0.14 % Dy 0.17 % Dy₂O₃
	Yttrium 0.58 % Y 0.74 % Y₂O₃
	Hafnium 0.05 % Hf 0.06 % HfO₂
	Zirconium 7.33 % Zr 9.90 % ZrO₂
	Titanium 0.45 % Ti 0.76 % TiO₂
	Manganese 4.33 % Mn 5.59 % MnO
	Niobium 0.58 % Nb 0.83 % Nb₂O₅
	Iron 1.29 % Fe 1.66 % FeO
	Silicon 20.78 % Si 44.47 % SiO₂
	Hydrogen 0.04 % H 0.33 % H₂O
	Tungsten 4.25 % W 5.36 % WO₃
	Carbon 0.36 % C 1.30 % CO₂
	Neodymium 0.77 % Nd 0.90 % Nd₂O₃
	Chlorine 0.79 % Cl 0.79 % Cl
	- % Cl -0.18 % -O=Cl₂
	Oxygen 36.63 % O
	______ ______
	100.00 % 100.94 % = TOTAL OXIDE
Empirical Formula:	Na_11.74Ce_0.64La_0.33Dy_0.03Sr_0.54Ca_0.51Y_0.22K_0.19Ca_5.06Pr_0.24Nd_0.18Gd_0.06Sm_0.02Mn²⁺_0.44 Mn²⁺_2.22Fe²⁺_0.78Zr_2.71Ti_0.32Hf_0.01Cl_0.75
Environment:	Occurs intergrown with zirsilite-(Ce) in a cavity near the margin of a marble xenolith in an igneous breccia along the contact between porphyritic nepheline syenite and sodalite sye nite. Eudialyte group
IMA Status:	Approved IMA 2004 (Dana # Added)
Locality:	Poudrette Quarry, Mont Saint-Hilaire, Rouville County, Quebec, Canada Link to MinDat.org Location Data.
Name Origin:	Named for Ole Johnsen (b. 1940), of the Geological Museum, University of Copenhagen, Denmark, and for his extensive research into the eudialyte group.
Synonym:	IMA2004-026

General Johnsenite-(Ce) Information