Mineralogy Database

Zwieselite Mineral Data

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General Zwieselite Information

Help on Chemical  Formula: Chemical Formula: (Fe++,Mn)2(PO4)F
Help on Composition: Composition: Molecular Weight = 225.21 gm
   Manganese   12.20 %  Mn   15.75 % MnO
   Iron        37.20 %  Fe   47.85 % FeO
   Phosphorus  13.75 %  P    31.51 % P2O5
   Oxygen      28.42 %  O
   Fluorine     8.44 %  F     8.44 % F
                 -   %   F    -3.55 % -O=F2    
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe2+1.5Mn2+0.5(PO4)F
Help on Environment: Environment: Forms a series with triplite (Fe) and magniotriplite (Mg).
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1841
Help on Locality: Locality: Rebenstein, Zweisel, Bavaria, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Zwieselite + Pronunciation Say ZWIESELITE
Help on Synonym: Synonym: ICSD 4428
  PDF 21-811

Zwieselite Image

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Comments: Brown zwieselite in granite pegmatite.
Location: Sauberg Mine, Ehrenfriedersdorf, Erzgebirge, Saxony, Germany. Scale: Specimen size 9 mm.
© Thomas Witzke / Abraxas-Verlag

Zwieselite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.8687:1:1.5339
Help on Cell Dimensions: Cell Dimensions: a = 12.046, b = 6.446, c = 9.888, Z = 8; beta = 107.42° V = 732.57 Den(Calc)= 4.08
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: I2/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.86(1), 3.03(0.9), 3.2(0.7),3.6(0.5), 2.12(0.4), 3.38(0.4), 2.59(0.3),

Physical Properties of Zwieselite

Help on Cleavage: Cleavage: {001} Good, {010} Distinct, {100} Indistinct
Help on Color: Color: Dark brown, Black, Black brown.
Help on Density: Density: 3.927 - 3.97, Average = 3.94
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.
Help on Habit: Habit: Pseudo Cubic - Crystals show a cubic outline.
Help on Hardness: Hardness: 5-5.5 - Apatite-Knife Blade
Help on Luster: Luster: Vitreous - Resinous
Help on Streak: Streak: white

Optical Properties of Zwieselite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.039 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.07 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1699,KPDmeas= 0.1755,KC= 0.1826
Ncalc = 1.72 - 1.75
Help on Optical Data: Optical Data: Biaxial (+), a=1.686, b=1.69, g=1.703, bire=0.0170, 2V(Calc)=60, 2V(Meas)=58.

Calculated Properties of Zwieselite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.77 gm/cc
note: Specific Gravity of Zwieselite =3.95 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0080221089
Boson Index = 0.9919778911
Help on Photoelectric: Photoelectric: PEZwieselite = 15.18 barns/electron
U=PEZwieselite x rElectron Density= 57.22 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Zwieselite is Not Radioactive

Zwieselite Classification

Help on  Dana Class: Dana Class: (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
  (41.06)where (A)2 (XO4) Zq
  (41.06.01)Zwieselite Group Zwieselite (Fe,Mn)2(PO4)F I2/a 2/m Triplite (Mn,Fe,Mg,Ca)2(PO4)(F,OH) I2/m 2/m Magniotriplite? (Mg,Fe,Mn)2(PO4)F P 21/a 2/m
Help on  Strunz Class: Strunz Class: 08.BB.10 08 - PHOSPHATES, ARSENATES, VANADATES
  08.B - Phosphates, etc. with Additional Anions, without H2O
  08.BB -With only medium-sized cations, (OH, etc.):RO4 � 1:1
08.BB.10 Magniotriplite? (Mg,Fe,Mn)2(PO4)F P 21/a 2/m
08.BB.10 Hydroxylwagnerite! Mg2(PO4)(OH) P 21/c 2/m
08.BB.10 Triplite (Mn,Fe,Mg,Ca)2(PO4)(F,OH) I2/m 2/m
08.BB.10 Zwieselite (Fe,Mn)2(PO4)F I2/a 2/m

Other Zwieselite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Zwieselite :
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

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Dana No: Strunz No: 08.BB.10





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