Burpalite Mineral Data

Burpalite Mineral Data +

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General Burpalite Information

Chemical Formula:

Na2CaZrSi2O7F2

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

- % F -4.17 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₂CaZrSi₂O₇F₂

Environment:

In a fenitized hornfelsic sandstone in the contact zone of an alkalic intrusive.

IMA Status:

Approved IMA 1990

Locality:

In the Burpala massif, about 120 km north of Lake Baikal, eastern Siberia, Russia. Link to MinDat.org Location Data.

Name Origin:

For its occurrence in the Burpala massif, Russia.

Synonym:

ICSD 89269

PDF 42-1322

Burpalite Image

Images:

Burpalite

Comments: Yellow crystalline grains of burpalite.
Location: Burpala, Transbaikal, Republic of Buryatia, Siberia, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Burpalite Crystallography

Axial Ratios:

a:b:c =0.9686:1:0.6946

Cell Dimensions:

a = 10.1173, b = 10.4446, c = 7.2555, Z = 4; beta = 90.039° V = 766.70 Den(Calc)= 3.32

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/a

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.95(1), 2.87(0.6), 3.3(0.4),

Crystal Structure:

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Merlino S , Perchiazzi N , Khomyakov A P , Pushcharovsky D Y , Kulikova I M , Kuzmin V I , European Journal of Mineralogy , 2 (1990) p.177-185, Burpalite, a new mineral from Burpalinskii massif, North Transbajkal, USSR:, its crystal structure and OD character, Locality: Burpalinskii massif, North Transbajkal, USSR

Physical Properties of Burpalite

Cleavage:

[???] Good

Color:

Colorless, Yellowish.

Density:

3.33

Diaphaniety:

Transparent to Translucent

Hardness:

5-6 - Between Apatite and Orthoclase

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Burpalite

Gladstone-Dale:

CI meas= 0.045 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.042 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1908,KPDmeas= 0.1902,KC= 0.1991

Optical Data:

Biaxial (-), a=1.627, b=1.634, g=1.639, bire=0.0120, 2V(Calc)=80, 2V(Meas)=80.1.

Calculated Properties of Burpalite

Electron Density:

r_electron=3.19 gm/cc
note: r_Burpalite=3.32 gm/cc.

Fermion Index

Fermion Index = 0.03381
Boson Index = 0.96619

Photoelectric:

PE_Burpalite= 34.00 barns/electron
U=PE_Burpalite x r_electron= 108.34 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Burpalite is Not Radioactive

Burpalite Classification

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 P 2₁/a 2/m

56.2.4.2 Burpalite Na2CaZrSi2O7F2 P 2₁/a 2/m

56.2.4.3 Cuspidine Ca4Si2O7(F,OH)2 P 2₁/c 2/m

56.2.4.4 Lavenite (Na,Ca)2(Mn,Fe)(Zr,Ti,Nb)Si2O7(O,OH,F) P 2₁/a 2/m

56.2.4.5 Wohlerite NaCa2(Zr,Nb)Si2O7(O,OH,F)2 P 2₁/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 Na4Ca8(Ti,Zr,Mn,Fe)3Si8O28F8 P1 1

56.2.4.10 Janhaugite (Na,Ca)3(Mn,Fe)3(Ti,Zr,Nb)2Si4O15(OH,F,O)3 P 2₁/n 2/m

56.2.4.11 Jennite Ca9Si6O18(OH)6·8H2O P1 1

56.2.4.12 Komarovite (Ca,Mn)2(Nb,Ti)2Si2O7(O,F)2·3.5(H2O) Unk Ortho

56.2.4.13 Na-komarovite? Na6CaNb6[Si4O12F2·4(H2O) C mmm 2/m 2/m 2/m

56.2.4.14 Suolunite Ca2Si2O5(OH)2·(H2O) F dd2 mm2

56.2.4.15 Mongolite Ca4Nb6Si5O24(OH)10·5(H2O) Unk Tetra

56.2.4.16 Kristiansenite! Ca2ScSn(Si2O7)(Si2O6OH) C1 1

56.2.4.17 Kochite! Na2(Na,Ca)4Ca4(Mn,Ca)2Zr2Ti2(Si2O7)4(O,F)4F4 P1 1

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 - Wöhlerite - Lavenite series

VIII/C.11-05 Cuspidine Ca4Si2O7(F,OH)2 P 2₁/c 2/m

VIII/C.11-10 Wohlerite NaCa2(Zr,Nb)Si2O7(O,OH,F)2 P 2₁/m 2/m

VIII/C.11-12 Janhaugite (Na,Ca)3(Mn,Fe)3(Ti,Zr,Nb)2Si4O15(OH,F,O)3 P 2₁/n 2/m

VIII/C.11-15 Normandite! NaCa(Mn,Fe)(Ti,Nb,Zr)Si2O7(O,F)2 P 2₁/a 2/m

VIII/C.11-20 Lavenite (Na,Ca)2(Mn,Fe)(Zr,Ti,Nb)Si2O7(O,OH,F) P 2₁/a 2/m

VIII/C.11-25 Burpalite Na2CaZrSi2O7F2 P 2₁/a 2/m

VIII/C.11-30 Baghdadite Ca3(Zr,Ti)Si2O9 P 2₁/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 Burpalite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Am.Min.,Vol.76,p665,1991) OPTIC PROP.(Am.Min.,Vol.76,p665,1991)

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Print or Cut-and-Paste your Burpalite Specimen Label here :

Burpalite

Na2CaZrSi2O7F2
Dana No: 56.2.4.2 Strunz No: VIII/C.11-25
Locality:

Notes: