Zwieselite Mineral Data

[Thumbnails] [Miniatures] [Cabinets] [About Us] [FAQ]
Welcome To Mason's Minerals
Your Source for Beautiful Minerals and Crystals
We offer a no-questioned-asked Satisfaction Guarantee

General Zwieselite Information

Chemical Formula:

(Fe++,Mn)2(PO4)F

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

Empirical Formula:

Fe²⁺_1.5Mn²⁺_0.5(PO₄)F

Environment:

Forms a series with triplite (Fe) and magniotriplite (Mg).

IMA Status:

Valid Species (Pre-IMA) 1841

Locality:

Rebenstein, Zweisel, Bavaria, Germany. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Zwieselite + Pronunciation

Synonym:

ICSD 4428

PDF 21-811

Zwieselite Image

Images:

Zwieselite

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

Zwieselite Crystallography

Axial Ratios:

a:b:c =1.8687:1:1.5339

Cell Dimensions:

a = 12.046, b = 6.446, c = 9.888, Z = 8; beta = 107.42° V = 732.57 Den(Calc)= 4.08

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: I2/a

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

By Intensity(I/I_o): 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),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Yakubovich O V , Simonov M A , Matvienko E N , Belov N V , Doklady Akademii Nauk SSSR , 238 (1978) p.576-579, The crystal structure of the synthetic finite Fe-term of the series triplite -, zwieselite Fe2(PO4)F

Physical Properties of Zwieselite

Cleavage:

{001} Good, {010} Distinct, {100} Indistinct

Color:

Dark brown, Black, Black brown.

Density:

3.927 - 3.97, Average = 3.94

Diaphaneity:

Translucent

Fracture:

Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.

Habit:

Pseudo Cubic - Crystals show a cubic outline.

Hardness:

5-5.5 - Apatite-Knife Blade

Luster:

Vitreous - Resinous

Streak:

white

Optical Properties of Zwieselite

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

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

Electron Density:

Bulk Density (Electron Density)=3.77 gm/cc
note: Specific Gravity of Zwieselite =3.95 gm/cc.

Fermion Index:

Fermion Index = 0.0080221089
Boson Index = 0.9919778911

Photoelectric:

PE_Zwieselite= 15.18 barns/electron
U=PE_Zwieselite x rElectron Density= 57.22 barns/cc.

Radioactivity:

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

Zwieselite Classification

Dana Class:

41.06.01.01 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.06)where (A)2 (XO4) Zq

(41.06.01)Zwieselite Group

41.06.01.01 Zwieselite (Fe,Mn)2(PO4)F I2/a 2/m

41.06.01.02 Triplite (Mn,Fe,Mg,Ca)2(PO4)(F,OH) I2/m 2/m

41.06.01.03 Magniotriplite? (Mg,Fe,Mn)2(PO4)F P 2₁/a 2/m

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

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

Search for Zwieselite using:

[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Zwieselite :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Desert Winds Gems and Minerals

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Zwieselite Mineral Data :

Ask about Zwieselite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Zwieselite

(Fe++,Mn)2(PO4)F
Dana No: 41.06.01.01 Strunz No: 08.BB.10
Locality:

Notes: