Sanjuanite Mineral Data

Sanjuanite Mineral Data +

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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.

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:

TriclinicSpace 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= -0.004 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2521,KPDmeas= 0.2534,KC= 0.251

Optical Data:

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

Calculated Properties of Sanjuanite

Electron Density:

r_electron=2.02 gm/cc
note: r_Sanjuanite=1.95 gm/cc.

Fermion Index

Fermion Index = 0.00089
Boson Index = 0.99911

Photoelectric:

PE_Sanjuanite= 1.28 barns/electron
U=PE_Sanjuanite x r_electron= 2.59 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Sanjuanite is Not Radioactive

Sanjuanite Classification

Dana Class:

43.5.1.3 (43)Compound Phosphates, etc.

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

(43.5.1)Dana Group

43.5.1.1 Sarmientite Fe2(AsO4)(SO4)(OH)·5(H2O) P 2₁/c 2/m

43.5.1.2 Bukovskyite Fe2(AsO4)(SO4)(OH)·7(H2O) P1 or P1 Tri

43.5.1.3 Sanjuanite Al2(PO4)(SO4)(OH)·9(H2O) P1 or P1 Tri

Strunz Class:

VII/D.12-30 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of medium size: Cu, Zn, Mn, Al, Fe

VII/D.12 - Sasaite - Kribergite ? series

VII/D.12-03 Mitryaevaite! Al5[(PO4)2[(P,S)O3(OH,O)]2F2(OH)2(H2O)8·6.48(H2O) P1 1

VII/D.12-05 Sasaite (Al,Fe)14(PO4)11(SO4)(OH)7·84(H2O) P 222 or Pmm2 or P mmm Ortho

VII/D.12-10 Vashegyite Al11(PO4)9(OH)6·38(H2O)orAl6(PO4)5(OH)3·23(H2O) Pna2 or P na2₁ mm2

VII/D.12-20 Vantasselite Al4(PO4)3(OH)3·9(H2O) Pma2,P 2₁am,Pmam Ortho

VII/D.12-30 Sanjuanite Al2(PO4)(SO4)(OH)·9(H2O) P1 or P1 Tri

VII/D.12-40 Kribergite Al5(PO4)3(SO4)(OH)4·4(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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Sanjuanite

Al2(PO4)(SO4)(OH)·9(H2O)
Dana No: 43.5.1.3 Strunz No: VII/D.12-30
Locality:

Notes: