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 % Na2 O
Calcium 19.26 % Ca 26.96 % CaO
Zirconium 11.54 % Zr 15.59 % ZrO2
Niobium 9.40 % Nb 13.45 % Nb2 O5
Iron 1.41 % Fe 1.82 % FeO
Silicon 14.21 % Si 30.40 % SiO2
Hydrogen 0.26 % H 2.28 % H2 O
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)Ca1.9 Fe2+ 0.1 Zr0.5 Nb0.4 Si2 O7.7 F0.6
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:
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
X Ray Diffraction:
By Intensity(I/Io ): 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:
PEWohlerite = 32.46 barns/electronU=PEWohlerite x r Electron 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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