Janhaugite Mineral Data

General Janhaugite Information

Chemical Formula:

(Na,Ca)3(Mn++,Fe++)3(Ti++++,Zr,Nb)2Si4O15(OH,F,O)3

Composition:

Molecular Weight = 773.35 gm

Sodium 8.32 % Na 11.22 % Na₂O

Calcium 1.04 % Ca 1.45 % CaO

Zirconium 4.72 % Zr 6.37 % ZrO₂

Titanium 9.29 % Ti 15.49 % TiO₂

Manganese 17.05 % Mn 22.01 % MnO

Niobium 3.60 % Nb 5.16 % Nb₂O₅

Iron 4.33 % Fe 5.57 % FeO

Silicon 13.80 % Si 29.52 % SiO₂

Hydrogen 0.18 % H 1.63 % H₂O

Oxygen 34.96 % O

Fluorine 2.70 % F 2.70 % F

- % F -1.14 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na_2.8Ca_0.2Mn²⁺_2.4Fe²⁺_0.6Ti_1.5Zr_0.4Nb_0.3Si_3.8O₁₅(OH)_1.4F_1.1O_0.5

Environment:

In groundmass and miarolitic cavities in sodium-rich granite.

IMA Status:

Approved IMA 1983

Locality:

From Gjerdingen, 30 km north of Olso, Norway. Link to MinDat.org Location Data.

Name Origin:

Named for Jan Haug, and amateur mineralogist who first observed the mineral.

Name Pronunciation:

Janhaugite + Pronunciation

Synonym:

ICSD 30900

PDF 35-641

Janhaugite Image

Images:

Janhaugite Dalyite

Comments: Tan crystalline dalyite (arrow) with reddish brown janhaugite.
Location: Gjerdingen, Nordmark, north of Oslo, Oslo, Norway. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Janhaugite

Comments: Reddish-brown columnar crystalline janhaugite in white matrix.
Location: Gjerdingen, Nordmark, north of Oslo, Oslo, Norway. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Janhaugite Crystallography

Axial Ratios:

a:b:c =1.09:1:1.4234

Cell Dimensions:

a = 10.668, b = 9.787, c = 13.931, Z = 4; beta = 107.82° V = 1,384.72 Den(Calc)= 3.71

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/n

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

By Intensity(I/I_o): 2.839(1), 2.782(0.9), 2.833(0.9),

Crystal Structure:

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Annehed H , Falth L , Raade G , Neues Jahrbuch fur Mineralogie, Monatshefte , 1985 (1985) p.7-18, The crystal structure of janhaugite, a sorosilicate of the cuspidine family

Physical Properties of Janhaugite

Cleavage:

{010} Distinct

Color:

Reddish brown.

Density:

3.6

Diaphaneity:

Semitransparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Habit:

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

Habit:

Striated - Parallel lines on crystal surface or cleavage face.

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

light brown

Optical Properties of Janhaugite

Gladstone-Dale:

CI meas= 0.01 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.039 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2253,KPDmeas= 0.2322,KC= 0.2346
Ncalc = 1.84 - 1.87

Optical Data:

Biaxial (+), a=1.77, b=1.828, g=1.91, bire=0.1400, 2V(Calc)=84, 2V(Meas)=80.

Pleochroism (x):

colorless.

Pleochroism (y):

beige.

Pleochroism (z):

beige.

Calculated Properties of Janhaugite

Electron Density:

Bulk Density (Electron Density)=3.46 gm/cc
note: Specific Gravity of Janhaugite =3.60 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Janhaugite= 19.67 barns/electron
U=PE_Janhaugite x rElectron Density= 68.03 barns/cc.

Radioactivity:

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

Janhaugite Classification

Dana Class:

56.02.04.10 (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 Janhaugite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(AntBidBlaNic2)

See Also:

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

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Print or Cut-and-Paste your Janhaugite Specimen Label here :

Janhaugite

(Na,Ca)3(Mn++,Fe++)3(Ti++++,Zr,Nb)2Si4O15(OH,F,O)3
Dana No: 56.02.04.10 Strunz No: 09.BE.17
Locality:

Notes: