Rosenbuschite Mineral Data

Rosenbuschite Mineral Data +

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General Rosenbuschite Information

Chemical Formula:

(Ca,Na)3(Zr,Ti)Si2O8F

Composition:

Molecular Weight = 390.97 gm

Sodium 4.41 % Na 5.94 % Na₂O

Calcium 23.06 % Ca 32.27 % CaO

Zirconium 17.50 % Zr 23.64 % ZrO₂

Titanium 3.06 % Ti 5.11 % TiO₂

Silicon 14.37 % Si 30.74 % SiO₂

Oxygen 32.74 % O

Fluorine 4.86 % F 4.86 % F

- % F -2.05 % -O=F₂

______ ______

100.00 % 100.51 % = TOTAL OXIDE

Empirical Formula:

Ca_2.25Na_0.75Zr_0.75Ti_0.25Si₂O₈F

IMA Status:

Valid Species (Pre-IMA) 1887

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 22334

PDF 14-447

Rosenbuschite Image

Images:

Rosenbuschite

Comments: Tan prismatic crystalline rosenbuschite in schist.
Location: Norra Karr, Jonkoping, Sweden. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Rosenbuschite Crystallography

Axial Ratios:

a:b:c =0.89:1:0.6467

Cell Dimensions:

a = 10.126, b = 11.377, c = 7.358, Z = 4; alpha = 91.3°, beta = 101.15°, gamma = 112.02° V = 770.80 Den(Calc)= 3.37

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 2.94(1), 3.06(0.8), 1.89(0.6),

Crystal Structure:

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Christiansen C C , Johnsen O , Makovicky E , The Canadian Mineralogist , 41 (2003) p.1203-1224, Crystal chemistry of the rosenbuschite group, Sample: LF-A5

Physical Properties of Rosenbuschite

Cleavage:

[???] Perfect, [???] Distinct

Color:

Gray, Orange, Brownish.

Density:

3.3

Diaphaniety:

Transparent to Translucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Acicular - Occurs as needle-like crystals.

Hardness:

5-6 - Between Apatite and Orthoclase

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Silky

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Rosenbuschite

Gladstone-Dale:

CI meas= 0.029 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.049 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2047,KPDmeas= 0.2091,KC= 0.2152

Optical Data:

Biaxial (+), a=1.678, b=1.687, g=1.705, bire=0.0270

Calculated Properties of Rosenbuschite

Electron Density:

r_electron=3.20 gm/cc
note: r_{Rosenbuschite}=3.30 gm/cc.

Fermion Index

Fermion Index = 0.03077
Boson Index = 0.96923

Photoelectric:

PE_{Rosenbuschite}= 27.23 barns/electron
U=PE_{Rosenbuschite} x r_electron= 87.22 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Rosenbuschite is Not Radioactive

Rosenbuschite Classification

Dana Class:

56.2.4.8 (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.12-40 VIII - Silicates

VIII/C - Sorosilicates with [Si2O7]6-, with anions unfamiliar to tetraheders [O,OH,F]

VIII/C.12 - Götzenite - Nacareniobsite-(Ce) series

VIII/C.12-10 Mosandrite Na(Na,Ca)2(Ca,Ce,Y)4(Ti,Nb,Zr)(Si2O7)2(O,F)2F3 P 2₁ 2

VIII/C.12-20 Rinkite! Na(Na,Ca)2(Ca,Ce)4(Ti,Nb)(Si2O7)2(O,F)2 P 2₁ 2

VIII/C.12-30 Nacareniobsite-(Ce) NbNa3Ca3(Ce,La)(Si2O7)2OF3 P 2₁/a 2/m

VIII/C.12-40 Rosenbuschite (Ca,Na)3(Zr,Ti)Si2O8F P1 1

VIII/C.12-50 Gotzenite (Ca,Na)3(Ti,Al)Si2O7(F,OH)2 P1 1

VIII/C.12-55 Kochite! Na2(Na,Ca)4Ca4(Mn,Ca)2Zr2Ti2(Si2O7)4(O,F)4F4 P1 1

VIII/C.12-60 Hainite Na4Ca8(Ti,Zr,Mn,Fe)3Si8O28F8 P1 1

Other Rosenbuschite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Rosenbuschite

(Ca,Na)3(Zr,Ti)Si2O8F
Dana No: 56.2.4.8 Strunz No: VIII/C.12-40
Locality:

Notes: