Bornemanite Mineral Data

Bornemanite Mineral Data +

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General Bornemanite Information

Chemical Formula:

BaNa3{(Na,Ti)4[(Ti,Nb)2O2Si4O14](F,OH)2}·PO4

Composition:

Molecular Weight = 908.83 gm

Potassium 0.43 % K 0.52 % K₂O

Barium 10.58 % Ba 11.81 % BaO

Sodium 13.66 % Na 18.41 % Na₂O

Titanium 12.12 % Ti 20.22 % TiO₂

Manganese 1.81 % Mn 2.34 % MnO

Niobium 7.16 % Nb 10.24 % Nb₂O₅

Silicon 12.36 % Si 26.44 % SiO₂

Phosphorus 3.41 % P 7.81 % P₂O₅

Hydrogen 0.08 % H 0.69 % H₂O

Oxygen 37.15 % O

Fluorine 1.25 % F 1.25 % F

- % F -0.53 % -O=F₂

______ ______

100.00 % 99.21 % = TOTAL OXIDE

Empirical Formula:

Na_2.8Ba_0.7K_0.1Na_2.6TiMn²⁺_0.3Ti_1.3Nb_0.7O₂Si₄O_14.4(OH)_0.7F_0.6(PO₄)

Environment:

Late hydrothermal mineral.

IMA Status:

Approved IMA 1975

Locality:

Yubileinaya (Jubilee) alkalic pegmatite, Mt. Karnarsut, Lovozero massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named or Irina Dimitrievna Borneman-Starynkevich (1890-), Russian mineralogist, Institute of Ore Deposits, Moscow. She was a student of the mineralogy of the Khibiny and Lovozero ma ssifs.

Bornemanite Image

Images:

Bornemanite Lomonosovite

Comments: Yellow crystalline bornemanite in dark brown lomonosovite.
Location: Yubileinaya Pegmatite, Lovozero Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Bornemanite

Comments: Pale yellow or peach colored, massive bornemanite.
Location: Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Picture size 5 mm.
© Tom Loomis / Dakota Matrix

Bornemanite Crystallography

Axial Ratios:

a:b:c =0.7721:1:6.7345

Cell Dimensions:

a = 5.498, b = 7.12, c = 47.95, Z = 4; beta = 88.4° V = 1,876.31 Den(Calc)= 3.22

Crystal System:

Monoclinic - DomaticH-M Symbol (m) Space Group: I11b

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

By Intensity(I/I_o): 3.44(1), 8.04(1), 24.1(1),

Crystal Structure:

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Ferraris G , Belluso E , Gula A , Soboleva S V , Ageeva O A , Borutskii B E , The Canadian Mineralogist , 39 (2001) p.1665-1673, A structure model of the layer titanosilicate bornemanite based on, seidozerite and lomonosovite modules

Physical Properties of Bornemanite

Cleavage:

[001] Perfect

Color:

Light yellow.

Density:

3.47 - 3.5, Average = 3.48

Diaphaniety:

Transparent to Translucent

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

3.5-4 - Copper Penny-Fluorite

Luster:

Pearly

Streak:

white

Optical Properties of Bornemanite

Gladstone-Dale:

CI meas= 0.148 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.078 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2166,KPDmeas= 0.2001,KC= 0.2349

Optical Data:

Biaxial (+), a=1.682-1.683, b=1.687-1.695, g=1.718-1.72, bire=0.0360-0.0370, 2V(Calc)=46-72, 2V(Meas)=66.

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

pale yellowish brown.

Calculated Properties of Bornemanite

Electron Density:

r_electron=3.07 gm/cc
note: r_Bornemanite=3.22 gm/cc.

Fermion Index

Fermion Index = 0.04046
Boson Index = 0.95954

Photoelectric:

PE_Bornemanite= 58.51 barns/electron
U=PE_Bornemanite x r_electron= 179.62 barns/cc.

Radioactivity:

GRapi = 5.90 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Bornemanite - barely detectable

Bornemanite Classification

Dana Class:

56.4.2.1 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O

(56.4)with [Si2O7] with phosphate, water

(56.4.2)Dana Group

56.4.2.1 Bornemanite BaNa3{(Na,Ti)4[(Ti,Nb)2O2Si4O14](F,OH)2}·PO4 I11b m

56.4.2.2 Bykovaite! BaNa{(Na,Ti)4[(Ti,Nb)2(OH,O)3Si4O14](OH,F)2}·3(H2O) I11b 2

Strunz Class:

VIII/B.17-10 VIII - Silicates

VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, cationes with coordinationnumber between [8] and [12]

VIII/B.17 - Bornemanite series

VIII/B.17-10 Bornemanite BaNa3{(Na,Ti)4[(Ti,Nb)2O2Si4O14](F,OH)2}·PO4 I11b m

Other Bornemanite Information

References:

NAME( Dana8) PHYS. PROP.(AmMin, Vol 97, p 1512) OPTIC PROP.(Dana8)

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Bornemanite

BaNa3{(Na,Ti)4[(Ti,Nb)2O2Si4O14](F,OH)2}·PO4
Dana No: 56.4.2.1 Strunz No: VIII/B.17-10
Locality:

Notes: