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Burpalite Mineral Data
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Burpalite Mineral Data Say BURPALITE Pronunciation Guide


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General Information
Help on Chemical Formula: Chemical Formula: Na2CaZrSi2O7F2
Help on Composition: Composition: Molecular Weight = 383.45 gm
   Sodium    11.99 %  Na   16.16 % Na2O
   Calcium   10.45 %  Ca   14.62 % CaO
   Zirconium 23.79 %  Zr   32.14 % ZrO2
   Silicon   14.65 %  Si   31.34 % SiO2
   Oxygen    29.21 %  O
   Fluorine   9.91 %  F     9.91 % F
            ______        ______
            100.00 %      104.17 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na2CaZrSi2O7F2
Help on Environment: Environment: In a fenitized hornfelsic sandstone in the contact zone of an alkalic intrusive.
Help on IMA Status: IMA Status: Approved IMA 1988
Help on Locality: Locality: In the Burpala massif, about 120 km north of Lake Baikal, eastern Siberia, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For its occurrence in the Burpala massif, Russia.
 

Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.9686:1:0.6946
Help on Cell Dimensions: Cell Dimensions: a = 10.1173, b = 10.4446, c = 7.2555, Z = 4; beta = 90.039ø V = 766.70 Den(Calc)= 3.32
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P21/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.95(1) 2.87(0.6) 3.3(0.4)
 

Physical Properties
Help on Cleavage: Cleavage: [???] Good
Help on Color: Color: colorless or yellowish.
Help on Density: Density: 3.33
Help on Diaphaniety: Diaphaniety: Transparent to Translucent
Help on Hardness: Hardness: 5-6 - Between Apatite and Orthoclase
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties
Help on Optical Data: Optical Data: Biaxial (-), a=1.627, b=1.634, g=1.639, bire=0.0120, 2V(Calc)=80, 2V(Meas)=80.1.
 

Classification
Help on Dana Class: Dana Class: 56.2.4.2 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O
  (56.2)with cations in [4] and/or >[4] coordination
  (56.2.4)Cuspidine - Wohlerite group
 
56.2.4.1 Baghdadite Ca3(Zr,Ti)Si2O9 P21/a 2/m
 
56.2.4.2 Burpalite Na2CaZrSi2O7F2 P21/a 2/m
 
56.2.4.3 Cuspidine Ca4Si2O7(F,OH)2 P21/c 2/m
 
56.2.4.4 Lavenite (Na,Ca)2(Mn,Fe)(Zr,Ti,Nb)Si2O7(O,OH,F) P21/a 2/m
 
56.2.4.5 Wohlerite NaCa2(Zr,Nb)Si2O7(O,OH,F)2 P21/m 2/m
 
56.2.4.6 Niocalite Ca14Nb2(Si2O7)4O6F2 Pa m
 
56.2.4.7 Hiortdahlite (Ca,Na,Y)3(Zr,Ti)Si2O7(F,O,OH)2 P1- -1
 
56.2.4.8 Rosenbuschite (Ca,Na)3(Zr,Ti)Si2O8F P1- -1
 
56.2.4.9 Hainite Na2Ca4(Ti,Zr,Mn,Fe)2(Si2O7)F4 P1- -1
 
56.2.4.10 Janhaugite (Na,Ca)3(Mn,Fe)3(Ti,Zr,Nb)2Si4O15(OH,F,O)3 P21/n 2/m
 
56.2.4.11 Jennite Ca9H2Si6O18(OH)8·6(H2O) P1or P-1 Tri
 
56.2.4.12 Komarovite (Ca,Mn)2(Nb,Ti)2Si2O7(O,F)2·3.5(H2O) Unk Ortho
 
56.2.4.13 Sodium-komarovite* (Na,Ca,H)4Nb4Si4O12O8(OH,F)4·2(H2O) Unk Ortho
 
56.2.4.14 Suolunite Ca2Si2O5(OH)2·(H2O) Fdd2 mm2
 
56.2.4.15 Mongolite Ca4Nb6Si5O24(OH)10·5(H2O) Unk Tetra
Help on Strunz Class: Strunz Class: VIII/C.11-25 VIII - Silicates
  VIII/C - Sorosilicates with [Si2O7]6-, with anions unfamiliar to tetraheders [O,OH,F]
  VIII/C.11 - STRUNZ VIII/C.11-25 - Silicates [Sorosilicates with [Si2O7]6-, with anions unfamiliar to tetraheders [O,OH,F] {Wöhlerite - Lavenite series}]
 
VIII/C.11-05 Cuspidine Ca4Si2O7(F,OH)2 P21/c 2/m
 
VIII/C.11-12 Janhaugite (Na,Ca)3(Mn,Fe)3(Ti,Zr,Nb)2Si4O15(OH,F,O)3 P21/n 2/m
 
VIII/C.11-15 Normandite NaCa(Mn,Fe)(Ti,Nb,Zr)Si2O7(O,F)2 P21/a 2/m
 
VIII/C.11-25 Burpalite Na2CaZrSi2O7F2 P21/a 2/m
 
VIII/C.11-30 Baghdadite Ca3(Zr,Ti)Si2O9 P21/a 2/m
 
VIII/C.11-40 Niocalite Ca14Nb2(Si2O7)4O6F2 Pa m
 
VIII/C.11-50 Hiortdahlite (Ca,Na,Y)3(Zr,Ti)Si2O7(F,O,OH)2 P1- -1
 

Other Information
Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Am.Min.,Vol.76,p665,1991) OPTIC PROP.(Am.Min.,Vol.76,p665,1991)
Help on See Also: See Also: Links to other databases for Burpalite :
  1 -Athena Mineralogy   2 - EUROmin Project   3 -Google Images   4 -Handbook of Mineralogy   5 -MinMax   6 - WWW-MINCRYST   7 -École des Mines de Paris

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