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Orpheite Mineral Data

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General Orpheite Information

Help on Chemical  Formula: Chemical Formula: PbAl3(PO4,SO4)2(OH)6 (?)
Help on Composition: Composition: Molecular Weight = 580.68 gm
   Aluminum    13.94 %  Al   26.34 % Al2O3
   Phosphorus   8.00 %  P    18.33 % P2O5
   Hydrogen     1.04 %  H     9.31 % H2O
   Lead        35.68 %  Pb   38.44 % PbO
   Sulfur       2.76 %  S     6.89 % SO3
   Oxygen      38.57 %  O
              ______        ______ 
              100.00 %       99.31 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: PbAl3(PO4)1.5(SO4)0.5(OH)6
Help on Environment: Environment: Secondary mineral in the oxidized zone of a polymetallic deposit.
Help on IMA Status: IMA Status: Approved IMA 1971
Help on Locality: Locality: Madjarovo Pb-Zn deposit, eastern Rhodopes Mountains, 60 km southeast of Haskovo, Bulgaria. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Orpheus, mythical singer in the Rhodopes Mountains.
Help on Name Pronunciation: Name Pronunciation: Orpheite Say ORPHEITE
 

Orpheite Image

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  Orpheite

Comments: Opaque botryoidal orpheite crust.
Location: Near Valmy, Humboldt County, Nevada, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Orpheite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:2.38857
Help on Cell Dimensions: Cell Dimensions: a = 7, c = 16.72, Z = 3; V = 709.52 Den(Calc)= 4.08
Help on Crystal System: Crystal System: Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: R 3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 5.66(1), 2.96(0.95), 3.5(0.65),
 

Physical Properties of Orpheite

Help on Color: Color: Colorless, Gray, Gray blue, Yellow green, Light blue.
Help on Density: Density: 3.75
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luminescence: Luminescence: Fluorescent, Short UV=turquoise blue, Long UV=turquoise blue.
Help on Streak: Streak: white
 

Optical Properties of Orpheite

Help on Dichroism (e): Dichroism (e): colorless.
Help on Dichroism (w): Dichroism (w): colorless.
Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.009 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.089 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1668,KPDmeas= 0.1815,KC= 0.183
Ncalc = 1.69 - 1.75
Help on Optical Data: Optical Data: Uniaxial (+), w=1.67, e=1.691, bire=0.0210.
 

Calculated Properties of Orpheite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.48 gm/cc
note: Specific Gravity of Orpheite =3.75 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.07
Boson Index = 0.93
Help on Photoelectric: Photoelectric: PEOrpheite = 591.17 barns/electron
U=PEOrpheite x rElectron Density=2,057.78 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Orpheite is Not Radioactive
 

Orpheite Classification

Help on  Dana Class: Dana Class: 43.04.01.04 (43)Compound Phosphates, etc.
  (43.04)(Anhydrous Compound Anions With Hydroxyl or Halogen)
  (43.04.01)Beudantite Group
 
43.04.01.01 Beudantite PbFe3(AsO4)(SO4)(OH)6 R 3m 3 2/m
 
43.04.01.02 Corkite PbFe3(PO4)(SO4)(OH)6 R 3m 3m
 
43.04.01.03 Hidalgoite PbAl3(AsO4)(SO4)(OH)6 R 3m 3 2/m
 
43.04.01.04 Orpheite PbAl3(PO4,SO4)2(OH)6(?) R 3m 3 2/m
 
43.04.01.05 Hinsdalite (Pb,Sr)Al3(PO4)(SO4)(OH)6 R 3m 3 2/m
 
43.04.01.06 Svanbergite SrAl3(PO4)(SO4)(OH)6 R 3m 3 2/m
 
43.04.01.07 Kemmlitzite (Sr,Ce)Al3(AsO4)(SO4)(OH)6 R 3m 3 2/m
 
43.04.01.08 Woodhouseite CaAl3(PO4)(SO4)(OH)6 R 3m 3 2/m
 
43.04.01.09 Weilerite BaAl3H[(As,P)O4]2(OH)6 R 3m 3 2/m
 
43.04.01.10 Gallobeudantite! PbGa3[(AsO4),(SO4)]2(OH)6 R 3m 3m
Help on  Strunz Class: Strunz Class: 08.BL.05 08 - PHOSPHATES, ARSENATES, VANADATES
  08.B - Phosphates, etc. with Additional Anions, without H2O
  08.BL -With medium-sized and large cations, (OH, etc.):RO4 = 3:1
 
08.BL.05 Beudantite PbFe3(AsO4)(SO4)(OH)6 R 3m 3 2/m
 
08.BL.05 Corkite PbFe3(PO4)(SO4)(OH)6 R 3m 3m
 
08.BL.05 Hidalgoite PbAl3(AsO4)(SO4)(OH)6 R 3m 3 2/m
 
08.BL.05 Gallobeudantite! PbGa3[(AsO4),(SO4)]2(OH)6 R 3m 3m
 
08.BL.05 Hinsdalite (Pb,Sr)Al3(PO4)(SO4)(OH)6 R 3m 3 2/m
 
08.BL.05 Kemmlitzite (Sr,Ce)Al3(AsO4)(SO4)(OH)6 R 3m 3 2/m
 
08.BL.05 Orpheite PbAl3(PO4,SO4)2(OH)6(?) R 3m 3 2/m
 
08.BL.05 Woodhouseite CaAl3(PO4)(SO4)(OH)6 R 3m 3 2/m
 
08.BL.05 Weilerite BaAl3H[(As,P)O4]2(OH)6 R 3m 3 2/m
 
08.BL.05 Svanbergite SrAl3(PO4)(SO4)(OH)6 R 3m 3 2/m
 

Other Orpheite 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 Orpheite :
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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Orpheite

PbAl3(PO4,SO4)2(OH)6 (?)
Dana No: 43.04.01.04 Strunz No: 08.BL.05
Locality:

 

Notes:

 

 
   
 


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