Woodruffite Mineral Data

Woodruffite Mineral Data
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General Woodruffite Information

Help on Chemical Formula: Chemical Formula: (Zn,Mn++)2Mn++++5O12•4(H2O)
Help on Composition: Composition: Molecular Weight = 668.48 gm
   Manganese  41.91 %  Mn    1.06 % MnO / 65.03 % MnO2
   Zinc       18.59 %  Zn   23.13 % ZnO
   Hydrogen    1.21 %  H    10.78 % H2O
   Oxygen     38.29 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Zn1.9Mn2+0.1Mn4+5O12•4(H2O)
Help on Environment: Environment: Oxidized material derived from the orebody outcrop.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1953
Help on Locality: Locality: Sterling Hill mine, Ogdensburg, Sussex County, New Jersey, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Samuel Woodruff, late-nineteenth-century miner and mineral collector at Franklin, who collected and preserved many of the finest specimens found at that locality.
Help on Name Pronunciation: Name Pronunciation: Woodruffite + Pronunciation Say WOODRUFFITE
 

Woodruffite Image

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Woodruffite

Comments: Dull brown massive woodruffite with limonite.
Location: Sterling Mine, Ogdensburg, Sussex County, New Jersey, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Woodruffite Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:1.10213
Help on Cell Dimensions: Cell Dimensions: a = 8.42, c = 9.28, Z = 2; V = 657.92 Den(Calc)= 3.37
Help on Crystal System: Crystal System: TetragonalSpace Group: Unk
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.66(1), 2.48(0.6), 2.66(0.6),
Click Here for Large Woodruffite Structure Window Crystal Structure:

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Post J E , Heaney P J , Cahill C L , Finger L W , American Mineralogist , 88 (2003) p.1697-1702, Woodruffite: A new Mn oxide structure with 3x4 tunnels, Sample: at T = 100 K

 

Physical Properties of Woodruffite

Help on Cleavage: Cleavage: None
Help on Color: Color: Brown, Iron black, Black brown.
Help on Density: Density: 4.01
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Botryoidal - "Grape-like" rounded forms (e.g.. malachite).
Help on Habit: Habit: Pulverulent - Forms a loose, poorly-coherent powdery mass.
Help on Hardness: Hardness: 4.5 - Between Fluorite and Apatite
Help on Luster: Luster: Earthy (Dull)
Help on Streak: Streak: brownish
 

Optical Properties of Woodruffite

Help on Optical Data: Optical Data: NCalc= 2.12 - from Gladstone-Dale relationship (KC = 0.3315) where Ncalc=Dcalc*KC+1
NCalc= 2.33 - from Gladstone-Dale relationship (KC = 0.3315) where Ncalc=Dmeas*KC+1
 

Calculated Properties of Woodruffite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.23 gm/cc
note: Specific Gravity of Woodruffite =3.37 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0078057293
Boson Index = 0.9921942707
Help on Photoelectric: Photoelectric: PEWoodruffite = 20.14 barns/electron
U=PEWoodruffite x rElectron Density= 65.07 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Woodruffite is Not Radioactive
 

Woodruffite Classification
Help on Dana Class: Dana Class: 07.08.01.02 (07)Multiple Oxides
  (07.08)where A B (O)2·x(H2O)
  (07.08.01)Dana Group
 
07.08.01.01 Todorokite (Na,Ca,K)2(Mn,Mn)6O12•3-4.5(H2O) P 2/m 2/m
 
07.08.01.02 Woodruffite (Zn,Mn)2Mn5O12•4(H2O) Unk Tetra
Help on Strunz Class: Strunz Class: 04.FL.25 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.F - Hydroxides (without V or U)
  04.FL -Hydroxides with H2O ± (OH); sheets of edge-sharing octahedra
 
04.FL.25 Woodruffite (Zn,Mn)2Mn5O12•4(H2O) Unk Tetra
 

Other Woodruffite Information
Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Woodruffite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Ask about Woodruffite 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 Woodruffite Specimen Label here :

Woodruffite

(Zn,Mn++)2Mn++++5O12•4(H2O)
Dana No: 07.08.01.02 Strunz No: 04.FL.25
Locality:

 

Notes: