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Sanjuanite

A valid IMA mineral species
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About SanjuaniteHide

00307150016349465479240.jpg
Flag of San Juan, Argentina
Formula:
Al2(PO4)(SO4)(OH) · 9H2O
Colour:
White
Lustre:
Silky, Dull
Hardness:
3
Specific Gravity:
1.94
Crystal System:
Triclinic
Name:
Named after the Province of San Juan, Argentina, the discovery locality.

Unique IdentifiersHide

Mindat ID:
3522
Long-form identifier:
mindat:1:1:3522:0
GUID
(UUID V4):
b0d12680-551e-4207-81a2-11ad3860caa6

IMA Classification of SanjuaniteHide

Classification of SanjuaniteHide

8.DB.30

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
B : With only medium-sized cations, (OH, etc.):RO4< 1:1
43.5.1.3

43 : COMPOUND PHOSPHATES, ETC.
5 : Hydrated Compound Phosphates, etc·, Containing Hydroxyl or Halogen
22.3.11

22 : Phosphates, Arsenates or Vanadates with other Anions
3 : Phosphates, arsenates or vanadates with sulphates

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
SjnIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of SanjuaniteHide

Silky, Dull
Transparency:
Transparent
Colour:
White
Hardness:
Fracture:
Irregular/Uneven
Density:
1.94 g/cm3 (Measured)    1.96 g/cm3 (Calculated)

Optical Data of SanjuaniteHide

Type:
Biaxial
RI values:
nα = 1.484 nγ = 1.499
Max Birefringence:
δ = 0.015
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v to r < v strong

Chemistry of SanjuaniteHide

Mindat Formula:
Al2(PO4)(SO4)(OH) · 9H2O

Crystallography of SanjuaniteHide

Crystal System:
Triclinic
Cell Parameters:
a = 11.314(11) Å, b = 9.018(9) Å, c = 7.376(7) Å
α = 93°, β = 95°, γ = 105°
Ratio:
a:b:c = 1.255 : 1 : 0.818
Unit Cell V:
721.96 ų (Calculated from Unit Cell)
Comment:
Questionable

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0018459SanjuaniteColombo F, Rius J, Pannunzio-Miner E V, Pedregosa J C, Cami G E, Carbonio R E (2011) Sanjuanite: Ab Initio crystal-structure solution from laboratory powder-diffraction data, complemented by FTIR spectroscopy and DT-TG analyses Pocito Department, San Juan Province, Argentina The Canadian Mineralogist 49 835-8472011Pensylvanian slates belonging to Los Jejenes Formation at the0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
10.77 Å(100)
4.13 Å(55)
5.28 Å(38)
4.32 Å(36)
3.450 Å(35)
8.66 Å(30)
4.27 Å(30)
Comments:
Sierra Chica de Zonda, Argentina. The data are from the type description.

Geological EnvironmentHide

Paragenetic Mode(s):

Type Occurrence of SanjuaniteHide

General Appearance of Type Material:
Microscopic laths, parallel to divergent, fibrous, in chalk-like aggregates.
Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA, 149522.
Geological Setting of Type Material:
Dark Carboniferous slate.
Associated Minerals at Type Locality:
Reference:
de Abeledo, M.E.J., Angelelli, V., de Benyacar, M.A.R., Gordillo, C. (1968) Sanjuanite, a new hydrated basic sulfate-phosphate of aluminum. American Mineralogist: 53: 1-8.

Synonyms of SanjuaniteHide

Other Language Names for SanjuaniteHide

German:Sanjuanit
Spanish:Sanjuanita

Relationship of Sanjuanite to other SpeciesHide

Other Members of this group:
DestineziteFe3+2(PO4)(SO4)(OH) · 6H2OTric. 1 : P1
SarmientiteFe3+2(AsO4)(SO4)(OH) · 5H2OMon. 2/m : P21/b
ZýkaiteFe3+4(AsO4)3(SO4)(OH) · 15H2OOrth. 2 2 2 : P2 2 2

Related Minerals - Strunz-mindat GroupingHide

8.DB.ArangasiteAl2F(PO4)(SO4) · 9H2O Mon. 2/m : P2/b
8.DB.Camaronesite[Fe3+(H2O)2(PO3OH)]2(SO4) · 1-2H2OTrig. 3 2 : R3 2
8.DB.HösliteFe3+3(VO4)2(SO4)(OH)(H2O)4 · 3H2OMon. 2/m : P21/b
8.DB.05DiadochiteFe3+2(PO4)(SO4)(OH) · 6H2OAmor.
8.DB.05Pitticite(Fe, AsO4, H2O) (?)Amor.
8.DB.05DestineziteFe3+2(PO4)(SO4)(OH) · 6H2OTric. 1 : P1
8.DB.07WilhelmgümbeliteZnFe2+Fe3+3(PO4)3(OH)4(H2O)5 · 2H2OOrth. mmm (2/m 2/m 2/m)
8.DB.07Schmidite[Zn2(Fe3+,Mn2+)2Fe3+(PO4)3(OH)3(H2O)6] · 2H2OOrth.
8.DB.07WildenaueriteZn(Fe3+,Mn2+)2MnFe3+(PO4)3(OH)3(H2O)6 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbam
8.DB.10VashegyiteAl11(PO4)9(OH)6 · 38H2OOrth. mmm (2/m 2/m 2/m)
8.DB.15SchooneriteZnMn2+Fe2+2Fe3+(PO4)3(OH)2 · 9H2OOrth. mmm (2/m 2/m 2/m) : Pbam
8.DB.20SinkankasiteMn2+Al(PO3OH)2(OH) · 6H2OTric. 1 : P1
8.DB.25MitryaevaiteAl6(PO4)((P,S)O3(OH,O))2F2(OH)2 · 14.5H2OTric. 1 : P1
8.DB.35SarmientiteFe3+2(AsO4)(SO4)(OH) · 5H2OMon. 2/m : P21/b
8.DB.40BukovskýiteFe3+2(AsO4)(SO4)(OH) · 9H2OTric. 1 : P1
8.DB.40FlurliteZn3Mn2+Fe3+(PO4)3(OH)2 · 9H2OMon. 2/m : P21/m
8.DB.40ManganflurliteZnMn2+3Fe3+(PO4)3(OH)2(H2O)7 · 2H2OMon. 2/m : P21/m
8.DB.42BohuslaviteFe3+4(PO4)3(SO4)(OH) · nH2OTric. 1 : P1
8.DB.45ZýkaiteFe3+4(AsO4)3(SO4)(OH) · 15H2OOrth. 2 2 2 : P2 2 2
8.DB.47LapeyreiteCu3O[AsO3(OH)]2 · 0.75H2OMon. 2/m : B2/m
8.DB.50GiniiteFe2+Fe3+4(PO4)3(OH)5 · 2H2OMon. 2/m : P2/b
8.DB.50RossiantoniteAl3(PO4)(SO4)2(OH)2(H2O)14Tric. 1 : P1
8.DB.52ArctowskiteAl9(PO4)8(OH)3 · 27H2OOrth.
8.DB.55Sasaite(Al,Fe3+)14(PO4)11(SO4)(OH)7 · 83H2OOrth.
8.DB.60McauslaniteFe3Al2(PO4)3(PO3OH)F · 18H2OTric.
8.DB.65GoldquarryiteCuCd2Al3(PO4)4F2(H2O,F)2 · 10H2OTric. 1 : P1
8.DB.70BirchiteCd2Cu2(PO4)2(SO4) · 5H2OOrth. mmm (2/m 2/m 2/m) : Pnma
8.DB.75BraithwaiteiteNaCu5(Ti4+Sb5+)(AsO4)4(HAsO4)2O2 · 8H2OTric. 1 : P1

Other InformationHide

Thermal Behaviour:
Heated in a closed tube, it gives of a high proportion of acid water.
Notes:
Readily soluble in warm mineral acids.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for SanjuaniteHide

References for SanjuaniteHide

Localities for SanjuaniteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Argentina (TL)
 
  • San Juan Province
    • Pocito Department
Poland
 
  • Silesian Voivodeship
    • Wodzisław County
      • Radlin
Venezuela
 
  • Bolívar
    • Auyán-tepui (Auyán-tepuy; Ayan Tepui)
    • Chimantá Massif (Chimantha Massif)
 
Mineral and/or Locality  
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