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Sanjuanite Mineral Data

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General Sanjuanite Information

Help on Chemical  Formula: Chemical Formula: Al2(PO4)(SO4)(OH)•9(H2O)
Help on Composition: Composition: Molecular Weight = 424.14 gm
   Aluminum    12.72 %  Al   24.04 % Al2O3
   Phosphorus   7.30 %  P    16.73 % P2O5
   Hydrogen     4.52 %  H    40.35 % H2O
   Sulfur       7.56 %  S    18.88 % SO3
   Oxygen      67.90 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Al2(PO4)(SO4)(OH)•9(H2O)
Help on IMA Status: IMA Status: Approved IMA 1968
Help on Locality: Locality: Sierra Chica de Zonda, San Juan Province, Argentina. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Sanjuanite + Pronunciation Say SANJUANITE

Sanjuanite Image

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Comments: Silky sanjuanite mass.
Location: Chica del Zonda, San Juan, Argentina. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Sanjuanite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.2546:1:0.8179
Help on Cell Dimensions: Cell Dimensions: a = 11.314, b = 9.018, c = 7.376, Z = 2; alpha = 93.07°, beta = 95.78°, gamma = 105.32° V = 721.10 Den(Calc)= 1.95
Help on Crystal System: Crystal System: Triclinic Space Group: P1 or P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 10.77(1), 4.13(0.55), 5.28(0.38),

Physical Properties of Sanjuanite

Help on Cleavage: Cleavage: None
Help on Color: Color: White.
Help on Density: Density: 1.94
Help on Fracture: Fracture: Earthy - Dull, clay-like fractures with no visible crystalline affinities, (e.g. howlite).
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Silky
Help on Streak: Streak: white

Optical Properties of Sanjuanite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.009 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.001 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2508,KPDmeas= 0.2534,KC= 0.251
Ncalc = 1.49
Help on Optical Data: Optical Data: Biaxial (?), a=1.484, g=1.499, bire=0.0150

Calculated Properties of Sanjuanite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.03 gm/cc
note: Specific Gravity of Sanjuanite =1.96 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0008997025
Boson Index = 0.9991002975
Help on Photoelectric: Photoelectric: PESanjuanite = 1.28 barns/electron
U=PESanjuanite x rElectron Density= 2.60 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Sanjuanite is Not Radioactive

Sanjuanite Classification

Help on  Dana Class: Dana Class: (43)Compound Phosphates, etc.
  (43.05)(Hydrated Compound Anions With Hydroxyl or Halogen)
  (43.05.01)Sarmientite Group Sarmientite Fe2(AsO4)(SO4)(OH)•5(H2O) P 21/c 2/m Bukovskyite Fe2(AsO4)(SO4)(OH)•7(H2O) P1 or P1 Tri Sanjuanite Al2(PO4)(SO4)(OH)•9(H2O) P1 or P1 Tri
Help on  Strunz Class: Strunz Class: 08.DB.30 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DB -With only medium-sized cations, (OH, etc.):RO4 < 1:1
08.DB.30 Sanjuanite Al2(PO4)(SO4)(OH)•9(H2O) P1 or P1 Tri

Other Sanjuanite Information

Help on References: References: NAME( Dana8) 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 Sanjuanite :
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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Dana No: Strunz No: 08.DB.30





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