Mineralogy Database

Gamagarite Mineral Data

Search Webmineral :
  
Advertisment

General Gamagarite Information

Help on Chemical  Formula: Chemical Formula: Ba2(Fe+++,Mn+++)(VO4)2(OH)
Help on Composition: Composition: Molecular Weight = 577.16 gm
   Barium     47.59 %  Ba   53.13 % BaO
   Manganese   2.38 %  Mn    3.42 % Mn2O3
   Vanadium   17.65 %  V    31.51 % V2O5
   Iron        7.26 %  Fe   10.38 % Fe2O3
   Hydrogen    0.17 %  H     1.56 % H2O
   Oxygen     24.95 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ba2Fe3+0.75Mn3+0.25(VO4)2(OH)
Help on Environment: Environment: Banded manganese ore replacing shale.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1943
Help on Locality: Locality: Along Gamagara Ridge, on Gloucester Farm, about 27 km north of Postmasburg, Cape Province, South Africa. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Gamagarite + Pronunciation Say GAMAGARITE
Help on Synonym: Synonym: ICSD 68348
  PDF 41-1413
 

Gamagarite Image

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image

  Gamagarite

Comments: Dark red-brown crystalline gamagarite in white calcite.
Location: Molinello Mine, Val Graveglia, Genova, Liguria, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Gamagarite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.4829:1:1.2771
Help on Cell Dimensions: Cell Dimensions: a = 9.15, b = 6.17, c = 7.88, Z = 2; beta = 112.7° V = 410.41 Den(Calc)= 4.67
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/m
 

Physical Properties of Gamagarite

Help on Cleavage: Cleavage: {001} Distinct, {100} Distinct, {101} Indistinct
Help on Color: Color: Brownish black, Dark brown, Black.
Help on Density: Density: 4.62
Help on Diaphaneity: Diaphaneity: Translucent to Opaque
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Hardness: Hardness: 4.5-5 - Near Apatite
Help on Luster: Luster: Adamantine
 

Optical Properties of Gamagarite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.029 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.018 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2274,KPDmeas= 0.2299,KC= 0.2234
Ncalc = 2.03 - 2.04
Help on Optical Data: Optical Data: Biaxial (+), a=2.016, b=2.04, g=2.13, bire=0.1140, 2V(Calc)=58, 2V(Meas)=46-62.
 

Calculated Properties of Gamagarite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.15 gm/cc
note: Specific Gravity of Gamagarite =4.67 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.08
Boson Index = 0.92
Help on Photoelectric: Photoelectric: PEGamagarite = 221.06 barns/electron
U=PEGamagarite x rElectron Density= 918.50 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Gamagarite is Not Radioactive
 

Gamagarite Classification

Help on  Dana Class: Dana Class: 41.10.04.03 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
  (41.10)where (A++ B++)3 (XO4)2 Zq
  (41.10.04)Goedkenite Group
 
41.10.04.01 Goedkenite (Sr,Ca)2Al(PO4)2(OH) P 21/m 2/m
 
41.10.04.02 Bearthite Ca2Al(PO4)2(OH) P 21/m 2/m
 
41.10.04.03 Gamagarite Ba2(Fe,Mn)(VO4)2(OH) P 21/m 2/m
 
41.10.04.04 Tokyoite! Ba2Mn(VO4)2(OH) P 21/m 2/m
Help on  Strunz Class: Strunz Class: 08.BG.05 08 - PHOSPHATES, ARSENATES, VANADATES
  08.B - Phosphates, etc. with Additional Anions, without H2O
  08.BG -With medium-sized and large cations, (OH, etc.):RO4 = 0.5:1
 
08.BG.05 Arsenbrackebuschite Pb2(Fe,Zn)(AsO4)2•(H2O) P 21/m 2/m
 
08.BG.05 Bearthite Ca2Al(PO4)2(OH) P 21/m 2/m
 
08.BG.05 Arsentsumebite Pb2Cu(AsO4)(SO4)(OH) P 21/m 2/m
 
08.BG.05 Brackebuschite Pb2(Mn,Fe)(VO4)2(OH) P 21/m 2/m
 
08.BG.05 Feinglosite! Pb2(Zn,Fe)[(As,S)O4]2•(H2O) P 21,P 21/m Mono
 
08.BG.05 Gamagarite Ba2(Fe,Mn)(VO4)2(OH) P 21/m 2/m
 
08.BG.05 Goedkenite (Sr,Ca)2Al(PO4)2(OH) P 21/m 2/m
 
08.BG.05 Tsumebite Pb2Cu(PO4)(SO4)(OH) P 21/m 2/m
 
08.BG.05 Calderonite! Pb2Fe(VO4)2(OH) P 21/m 2/m
 
08.BG.05 Bushmakinite! Pb2Al(PO4)(VO4)(OH) P 21/m 2/m
 
08.BG.05 Tokyoite! Ba2Mn(VO4)2(OH) P 21/m 2/m
 

Other Gamagarite Information

Help on References: References: NAME( AntBidBlaNic4) 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 Gamagarite :
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

Search for Gamagarite using:

Google
 
Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Gamagarite :

Ask about Gamagarite 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 Espaņol

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

Gamagarite

Ba2(Fe+++,Mn+++)(VO4)2(OH)
Dana No: 41.10.04.03 Strunz No: 08.BG.05
Locality:

 

Notes:

 

 
   
 


Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.