Sanjuanite Mineral Data

General Sanjuanite Information

Chemical Formula:

Al2(PO4)(SO4)(OH)•9(H2O)

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

Empirical Formula:

Al₂(PO₄)(SO₄)(OH)•9(H₂O)

IMA Status:

Approved IMA 1968

Locality:

Sierra Chica de Zonda, San Juan Province, Argentina. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Sanjuanite + Pronunciation

Sanjuanite Image

Images:

Sanjuanite

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

Sanjuanite Crystallography

Axial Ratios:

a:b:c =1.2546:1:0.8179

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

Crystal System:

Triclinic Space Group: P1 or P1

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 10.77(1), 4.13(0.55), 5.28(0.38),

Physical Properties of Sanjuanite

Cleavage:

None

Color:

White.

Density:

1.94

Fracture:

Earthy - Dull, clay-like fractures with no visible crystalline affinities, (e.g. howlite).

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

3 - Calcite

Luster:

Silky

Streak:

white

Optical Properties of Sanjuanite

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

Optical Data:

Biaxial (?), a=1.484, g=1.499, bire=0.0150

Calculated Properties of Sanjuanite

Electron Density:

Bulk Density (Electron Density)=2.03 gm/cc
note: Specific Gravity of Sanjuanite =1.96 gm/cc.

Fermion Index:

Fermion Index = 0.0008997025
Boson Index = 0.9991002975

Photoelectric:

PE_Sanjuanite= 1.28 barns/electron
U=PE_Sanjuanite x rElectron Density= 2.60 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Sanjuanite is Not Radioactive

Sanjuanite Classification

Dana Class:

43.05.01.03 (43)Compound Phosphates, etc.

(43.05)(Hydrated Compound Anions With Hydroxyl or Halogen)

(43.05.01)Sarmientite Group

43.05.01.01 Sarmientite Fe2(AsO4)(SO4)(OH)•5(H2O) P 2₁/c 2/m

43.05.01.02 Bukovskyite Fe2(AsO4)(SO4)(OH)•7(H2O) P1 or P1 Tri

43.05.01.03 Sanjuanite Al2(PO4)(SO4)(OH)•9(H2O) P1 or P1 Tri

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

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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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Sanjuanite

Al2(PO4)(SO4)(OH)•9(H2O)
Dana No: 43.05.01.03 Strunz No: 08.DB.30
Locality:

Notes:

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