Mineralogy Database

Despujolsite Mineral Data

Search Webmineral :

General Despujolsite Information

Help on Chemical  Formula: Chemical Formula: Ca3Mn++++(SO4)2(OH)6•3(H2O)
Help on Composition: Composition: Molecular Weight = 523.39 gm
   Calcium    22.97 %  Ca   32.14 % CaO
   Manganese  10.50 %  Mn   16.61 % MnO2
   Hydrogen    2.31 %  H    20.65 % H2O
   Sulfur     12.25 %  S    30.59 % SO3
   Oxygen     51.97 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca3Mn4+(SO4)2(OH)6•3(H2O)
Help on Environment: Environment: Hydrothermal manganese deposit.
Help on IMA Status: IMA Status: Approved IMA 1968
Help on Locality: Locality: Tachgagalt, Morocco. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Pierre Despujols (1888-?), founder of the Moroccan Geologic Survey.
Help on Name Pronunciation: Name Pronunciation: Despujolsite + Pronunciation Say DESPUJOLSITE
Help on Synonym: Synonym: ICSD 15729
  PDF 20-226

Despujolsite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.257
Help on Cell Dimensions: Cell Dimensions: a = 8.56, c = 10.76, Z = 2; V = 682.80 Den(Calc)= 2.55
Help on Crystal System: Crystal System: Hexagonal - Ditrigonal Dipyramidal H-M Symbol (6 m2) Space Group: P 62c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.34(1), 2.129(0.8), 4.26(0.8),

Physical Properties of Despujolsite

Help on Cleavage: Cleavage: {???} Good
Help on Color: Color: Lemon.
Help on Density: Density: 2.46
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luster: Luster: Vitreous (Glassy)

Optical Properties of Despujolsite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.057 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.02 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2624,KPDmeas= 0.272,KC= 0.2573
Ncalc = 1.63 - 1.66
Help on Optical Data: Optical Data: Uniaxial (+), w=1.656, e=1.682, bire=0.0260.

Calculated Properties of Despujolsite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.58 gm/cc
note: Specific Gravity of Despujolsite =2.55 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0014820241
Boson Index = 0.9985179759
Help on Photoelectric: Photoelectric: PEDespujolsite = 6.16 barns/electron
U=PEDespujolsite x rElectron Density= 15.90 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Despujolsite is Not Radioactive

Despujolsite Classification

Help on  Dana Class: Dana Class: (31)Hydrated Sulfates Containing Hydroxyl or Halogen
  (31.07)where (A+ B++)2 (XO4) Zq�x(H2O)
  (31.07.06)Despujolsite Group Despujolsite Ca3Mn(SO4)2(OH)6•3(H2O) P 62c 6 m2 Schaurteite Ca3Ge(SO4)2(OH)6•3(H2O) P 62c 6 m2 Fleischerite Pb3Ge(SO4)2(OH)6•3(H2O) P 63/mmc 6/m 2/m 2/m Mallestigite! Pb3Sb(SO4)(AsO4)(OH)6•3(H2O) P 63 6 2 2
Help on  Strunz Class: Strunz Class: 07.DF.25 07 - SULFATES (SELENATES, TELLURATES)
  07.D - Sulfates (selenates, etc.) with additional anions, with H2O
  07.DF -With large and medium-sized cations
07.DF.25 Despujolsite Ca3Mn(SO4)2(OH)6•3(H2O) P 62c 6 m2
07.DF.25 Fleischerite Pb3Ge(SO4)2(OH)6•3(H2O) P 63/mmc 6/m 2/m 2/m
07.DF.25 Mallestigite! Pb3Sb(SO4)(AsO4)(OH)6•3(H2O) P 63 6 2 2
07.DF.25 Schaurteite Ca3Ge(SO4)2(OH)6•3(H2O) P 62c 6 m2

Other Despujolsite Information

Help on References: References: NAME( AntBidBlaNic5) 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 Despujolsite :
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

Search for Despujolsite using:

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

Visit our Advertisers for Despujolsite :

Ask about Despujolsite 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 Despujolsite Specimen Label here :


Dana No: Strunz No: 07.DF.25





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