Lavenite Mineral Data

Lavenite Mineral Data +

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General Lavenite Information

Chemical Formula:

(Na,Ca)2(Mn,Fe++)(Zr,Ti,Nb)Si2O7(O,OH,F)

Composition:

Molecular Weight = 374.22 gm

Sodium 9.83 % Na 13.25 % Na₂O

Calcium 6.43 % Ca 8.99 % CaO

Zirconium 21.94 % Zr 29.64 % ZrO₂

Titanium 2.56 % Ti 4.27 % TiO₂

Manganese 4.40 % Mn 5.69 % MnO

Niobium 2.48 % Nb 3.55 % Nb₂O₅

Iron 2.98 % Fe 3.84 % FeO

Silicon 15.01 % Si 32.11 % SiO₂

Hydrogen 0.08 % H 0.72 % H₂O

Oxygen 33.78 % O

Fluorine 0.51 % F 0.51 % F

- % F -0.21 % -O=F₂

______ ______

100.00 % 102.35 % = TOTAL OXIDE

Empirical Formula:

Na_1.6Ca_0.4Mn²⁺_0.3Ca_0.2Fe²⁺_0.2Zr_0.9Ti_0.2Nb_0.1(Si₂O₇)O_0.6(OH)_0.3F_0.1

Environment:

In alkalic rocks and related pegmatites.

IMA Status:

Valid Species (Pre-IMA) 1885

Locality:

In Norway, on Laven and the Aro Islands. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

ICSD 100722

PDF 14-606

Lavenite Image

Images:

Lavenite

Comments: Orange crystalline lavenite grains in pegmatite.
Location: Mount Takhtarvumchorr, Khibiny Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Lavenite Crystallography

Axial Ratios:

a:b:c =1.0646:1:0.7212

Cell Dimensions:

a = 10.54, b = 9.9, c = 7.14, Z = 4; beta = 108.2° V = 707.76 Den(Calc)= 3.51

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): 2.89(1), 2.81(0.9), 3.22(0.5),

Physical Properties of Lavenite

Cleavage:

[100] Good

Color:

Colorless, Light yellow, Dark yellow, Brown, Brownish red.

Density:

3.51 - 3.55, Average = 3.53

Diaphaniety:

Translucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Pistolitic - > 3mm rounded spherical grains.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

6 - Orthoclase

Luster:

Vitreous - Dull

Streak:

yellow

Optical Properties of Lavenite

Gladstone-Dale:

CI meas= 0.11 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.105 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1975,KPDmeas= 0.1964,KC= 0.2208

Optical Data:

Biaxial (-), a=1.67, b=1.69, g=1.72, bire=0.0500, 2V(Calc)=80, 2V(Meas)=40-70. Dispersion r < v perceptible.

Pleochroism (x):

colorless or pale yellow.

Pleochroism (y):

colorless or pale greenish.

Pleochroism (z):

very pale yellow or orange to brown yellow.

Calculated Properties of Lavenite

Electron Density:

r_electron=3.36 gm/cc
note: r_Lavenite=3.51 gm/cc.

Fermion Index

Fermion Index = 0.03581
Boson Index = 0.96419

Photoelectric:

PE_Lavenite= 37.13 barns/electron
U=PE_Lavenite x r_electron= 124.83 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Lavenite is Not Radioactive

Lavenite Classification

Dana Class:

56.2.4.4 (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.11-20 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 Lavenite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic2)

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Lavenite

(Na,Ca)2(Mn,Fe++)(Zr,Ti,Nb)Si2O7(O,OH,F)
Dana No: 56.2.4.4 Strunz No: VIII/C.11-20
Locality:

Notes: