Wohlerite Mineral Data

General Wohlerite Information

Chemical Formula:

NaCa2(Zr,Nb)Si2O7(O,OH,F)2

Composition:

Molecular Weight = 395.27 gm

Sodium 5.82 % Na 7.84 % Na₂O

Calcium 19.26 % Ca 26.96 % CaO

Zirconium 11.54 % Zr 15.59 % ZrO₂

Niobium 9.40 % Nb 13.45 % Nb₂O₅

Iron 1.41 % Fe 1.82 % FeO

Silicon 14.21 % Si 30.40 % SiO₂

Hydrogen 0.26 % H 2.28 % H₂O

Oxygen 35.22 % O

Fluorine 2.88 % F 2.88 % F

- % F -1.21 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na(OH)Ca_1.9Fe²⁺_0.1Zr_0.5Nb_0.4Si₂O_7.7F_0.6

Environment:

Late phase in alkalic pegmatites, accessory mineral in nepheline syenites, in fenites associated with alkaline intrusives, and in carbonatites.

IMA Status:

Valid Species (Pre-IMA) 1843

Locality:

Islands in the Langesundsfjord, aroung Brevik, and at Tvedalen, Norway. Link to MinDat.org Location Data.

Name Origin:

Named for Friedrich Wohler (1800-1882), German chemist, Gottingen, Germay.

Name Pronunciation:

Wohlerite + Pronunciation

Synonym:

Woehlerite

Wohlerite Image

Images:

Wohlerite Biotite

Comments: Prismatic wohlerite crystals with lepidomelane (Fe-rich biotite).
Location: Langevannet, Tvedalen, Telemark, Norway. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Ferro-edenite Wohlerite

Comments: Transparent yellow wöhlerite crystals embedded in pink feldspar and black mica matrix with black ferro-edenite (var. barkevikite).
Location: Langesundsfjorden, Sandoya Island, Porsgrunn, Norway. Scale: Specimen Size: 5x5x3.5 cm.
© John Betts - Fine Minerals

Wohlerite Crystallography

Axial Ratios:

a:b:c =1.0526:1:0.7076

Cell Dimensions:

a = 10.8, b = 10.26, c = 7.26, Z = 4; beta = 108.95° V = 760.87 Den(Calc)= 3.45

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2₁/m

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

By Intensity(I/I_o): 2.839(1), 2.998(0.7), 3.25(0.6),

Physical Properties of Wohlerite

Cleavage:

{010} Distinct, {100} Poor, {110} Poor

Color:

Yellow, Dark yellow, Gray, Brown.

Density:

3.42

Diaphaneity:

Transparent to Translucent

Fracture:

Brittle - Splintery - Brittle fracture leaving splintery fragments.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

5.5-6 - Knife Blade-Orthoclase

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Greasy

Streak:

pale yellow

Optical Properties of Wohlerite

Gladstone-Dale:

CI meas= 0.032 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.04 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2075,KPDmeas= 0.2093,KC= 0.2162
Ncalc = 1.74 - 1.75

Optical Data:

Biaxial (-), a=1.7-1.705, b=1.716-1.72, g=1.726-1.728, bire=0.0230-0.0260, 2V(Calc)=70-76, 2V(Meas)=70-77. Dispersion r > v weak.

Pleochroism (x):

nearly colorless.

Pleochroism (y):

pale yellow.

Pleochroism (z):

wine yellow.

Calculated Properties of Wohlerite

Electron Density:

Bulk Density (Electron Density)=3.32 gm/cc
note: Specific Gravity of Wohlerite =3.42 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Wohlerite= 32.46 barns/electron
U=PE_Wohlerite x rElectron Density= 107.86 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Wohlerite is Not Radioactive

Wohlerite Classification

Dana Class:

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

(56.02)with cations in [4] and/or >[4] coordination

(56.02.04)Cuspidine - Wohlerite group

56.02.04.01 Baghdadite Ca3(Zr,Ti)Si2O9 P 2₁/a 2/m

56.02.04.02 Burpalite Na2CaZrSi2O7F2 P 2₁/a 2/m

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

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

56.02.04.05 Wohlerite NaCa2(Zr,Nb)Si2O7(O,OH,F)2 P 2₁/m 2/m

56.02.04.06 Niocalite Ca14Nb2(Si2O7)4O6F2 Pa m

56.02.04.07 Hiortdahlite (Ca,Na,Y)3(Zr,Ti)Si2O7(F,O,OH)2 P1 1

56.02.04.08 Rosenbuschite (Ca,Na)3(Zr,Ti)Si2O8F P1 1

56.02.04.09 Hainite Na4Ca8(Ti,Zr,Mn,Fe)3Si8O28F8 P1 1

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

56.02.04.11 Jennite Ca9Si6O18(OH)6•8H2O P1 1

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

56.02.04.13 Natrokomarovite* Na6CaNb6[Si4O12F2•4(H2O) C mmm 2/m 2/m 2/m

56.02.04.14 Suolunite Ca2Si2O5(OH)2•(H2O) F dd2 mm2

56.02.04.15 Mongolite Ca4Nb6Si5O24(OH)10•5(H2O) Unk Tetra

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

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

56.02.04.18 Marianoite! Na2Ca4(Nb,Zr)2(Si2O7)2(O,F)4 P 2₁ 2/m

Strunz Class:

09.BE.17 09 - SILICATES (Germanates)

09.B - Sorosilicates

09.BE -Si2O7 groups with additional anions;

09.BE.17 Baghdadite Ca3(Zr,Ti)Si2O9 P 2₁/a 2/m

09.BE.17 Janhaugite (Na,Ca)3(Mn,Fe)3(Ti,Zr,Nb)2Si4O15(OH,F,O)3 P 2₁/n 2/m

09.BE.17 Burpalite Na2CaZrSi2O7F2 P 2₁/a 2/m

09.BE.17 Cuspidine Ca4Si2O7(F,OH)2 P 2₁/c 2/m

09.BE.17 Hiortdahlite (Ca,Na,Y)3(Zr,Ti)Si2O7(F,O,OH)2 P1 1

09.BE.17 Lavenite (Na,Ca)2(Mn,Fe)(Zr,Ti,Nb)Si2O7(O,OH,F) P 2₁/a 2/m

09.BE.17 Niocalite Ca14Nb2(Si2O7)4O6F2 Pa m

09.BE.17 Normandite! NaCa(Mn,Fe)(Ti,Nb,Zr)Si2O7(O,F)2 P 2₁/a 2/m

09.BE.17 Wohlerite NaCa2(Zr,Nb)Si2O7(O,OH,F)2 P 2₁/m 2/m

09.BE.17 Marianoite! Na2Ca4(Nb,Zr)2(Si2O7)2(O,F)4 P 2₁ 2/m

Other Wohlerite Information

References:

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

See Also:

Links to other databases for Wohlerite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - EUROmin Project
6 - Ecole des Mines de Paris
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - WWW-MINCRYST

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Wohlerite

NaCa2(Zr,Nb)Si2O7(O,OH,F)2
Dana No: 56.02.04.05 Strunz No: 09.BE.17
Locality:

Notes:

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