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Sanjuanite

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Sierra Chica de Zonda, Pocito Department, San Juan, Argentina
© 2007, J. Weissman

Formula:
Al
 
2
[OH|SO
 
4
|PO
 
4
] · 9H
 
2
O
Colour:WhiteHardness:3
Name:Named after its discovery locality.


Sanjuanite-Destinezite Group

Classification of Sanjuanite

IMA status:Approved 1966
Strunz 8th edition ID:7/D.12-30
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:43.5.1.3

43 : COMPOUND PHOSPHATES, ETC.
5 : Hydrated Compound Phosphates, etc·, Containing Hydroxyl or Halogen
Hey's CIM Ref.:22.3.11

22 : Phosphates, Arsenates or Vanadates with other Anions
3 : Phosphates, arsenates or vanadates with sulphates
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Type Occurrence of Sanjuanite

Type Locality:Sierra Chica de Zonda, Pocito Department, San Juan, Argentina
Year of Discovery:1968

Physical Properties of Sanjuanite

Lustre:Silky, Dull
Colour:White
Hardness (Mohs):3

Optical Data of Sanjuanite

Type:Biaxial
RI values: nα = 1.484 nγ = 1.499
Maximum Birefringence:δ = 0.015

Chart 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

Chemical Properties of Sanjuanite

Formula:
Al
 
2
[OH|SO
 
4
|PO
 
4
] · 9H
 
2
O
Essential elements:Al, H, O, P, S
All elements listed in formula:Al, H, O, P, S

Relationship of Sanjuanite to other Species

Related to:
  • Sanjuanite-Destinezite Group
    • Related Minerals - Nickel-Strunz Grouping):

    - +
    8.DB.05Diadochite
    Fe
    3+
    2
    		(PO
     
    4
    		)(SO
     
    4
    		)(OH) · 5H
     
    2
    		O
    8.DB.05Pitticite
    [Fe, SO
     
    4
    		, AsO
     
    4
    		, H
     
    2
    		O] ?
    8.DB.05Destinezite
    Fe
    3+
    2
    		[OH|SO
     
    4
    		|PO
     
    4
    		] · 5H
     
    2
    		O
    8.DB.10Vashegyite
    Al
     
    11
    		[(OH)
     
    6
    		|(PO
     
    4
    		)
     
    9
    		] · 38H
     
    2
    		O
    8.DB.15Schoonerite
    ZnMn
    2+
     
    		Fe
    2+
    2
    		Fe
    3+
     
    		(PO
     
    4
    		)
     
    3
    		(OH)
     
    2
    		 · 9H
     
    2
    		O
    8.DB.20Sinkankasite
    H
     
    2
    		Mn
    2+
     
    		Al[OH|(PO
     
    4
    		)
     
    2
    		] · 6H
     
    2
    		O
    8.DB.25Mitryaevaite
    Al
     
    11
    		[F
     
    3
    		|(OH)
     
    1.3
    		|(SO
     
    4
    		)
     
    1.3
    		|(PO
     
    4
    		)
     
    8.7
    		] · 30H
     
    2
    		O
    8.DB.35Sarmientite
    Fe
    3+
    2
    		[OH|SO
     
    4
    		|AsO
     
    4
    		] · 5H
     
    2
    		O
    8.DB.40Bukovskýite
    Fe
    3+
    2
    		[OH|SO
     
    4
    		|AsO
     
    4
    		] · 7H
     
    2
    		O
    8.DB.45Zýkaite
    Fe
    3+
    4
    		[OH|SO
     
    4
    		|(AsO
     
    4
    		)
     
    3
    		] · 15H
     
    2
    		O
    8.DB.50Giniite
    Fe
    2+
     
    		Fe
    3+
    4
    		[(OH)
     
    5
    		|(PO
     
    4
    		)
     
    3
    		] · 2H
     
    2
    		O
    8.DB.55Sasaite
    (Al,Fe
    3+
     
    		)
     
    14
    		[(OH)
     
    7
    		|SO
     
    4
    		|(PO
     
    4
    		)
     
    11
    		] · 83H
     
    2
    		O
    8.DB.60Mcauslanite
    HFe
    2+
    3
    		Al
     
    2
    		[F|(PO
     
    4
    		)
     
    4
    		] · 18H
     
    2
    		O
    8.DB.65Goldquarryite
    CuCd
     
    2
    		Al
     
    3
    		(PO
     
    4
    		)
     
    4
    		F
     
    2
    		(H
     
    2
    		O)
     
    10
    		(H
     
    2
    		O,F)
     
    2
    8.DB.70Birchite
    Cd
     
    2
    		Cu
     
    2
    		(PO
     
    4
    		)
     
    2
    		(SO
     
    4
    		)·5H
     
    2
    		O
    Related Minerals - Hey's Index Grouping:

    - +
    22.3.1Parnauite
    Cu
     
    9
    		[(OH)
     
    10
    		|SO
     
    4
    		|(AsO
     
    4
    		)
     
    2
    		] · 7H
     
    2
    		O
    22.3.2Ardealite
    Ca
     
    2
    		[HPO
     
    4
    		|SO
     
    4
    		] · 4H
     
    2
    		O
    22.3.3Machatschkiite
    (Ca,Na)
     
    6
    		AsO
     
    4
    		(AsO
     
    3
    		OH)
     
    3
    		(PO
     
    4
    		,SO
     
    4
    		)·15H
     
    2
    		O
    22.3.4Clinotyrolite
    Ca
     
    2
    		Cu
     
    9
    		[(OH,O)
     
    10
    		|(AsO
     
    4
    		,SO
     
    4
    		)
     
    4
    		] · 10H
     
    2
    		O
    22.3.5Peisleyite
    Na
     
    3
    		Al
     
    16
    		[SO
     
    4
    		|(PO
     
    4
    		)
     
    5
    		]
     
    2
    		 · 20H
     
    2
    		O
    22.3.6Chalcophyllite
    Cu
     
    18
    		Al
     
    2
    		[(OH)
     
    9
    		|SO
     
    4
    		|AsO
     
    4
    		]
     
    3
    		 · 33H
     
    2
    		O
    22.3.7Woodhouseite
    CaAl
     
    3
    		[(OH)
     
    6
    		|SO
     
    4
    		|PO
     
    4
    		]
    22.3.8Schlossmacherite
    (H
     
    3
    		O,Ca)Al
     
    3
    		[(OH)
     
    6
    		|(SO
     
    4
    		,AsO
     
    4
    		)
     
    2
    		]
    22.3.9Svanbergite
    SrAl
     
    3
    		[(OH)
     
    6
    		|SO
     
    4
    		|PO
     
    4
    		]
    22.3.10Kemmlitzite
    (Sr,Ce)Al
     
    3
    		[(OH)
     
    6
    		|SO
     
    4
    		|AsO
     
    4
    		]
    22.3.12Kribergite
    Al
     
    5
    		[(OH)
     
    4
    		|SO
     
    4
    		|(PO
     
    4
    		)
     
    3
    		] · 4H
     
    2
    		O
    22.3.13Hotsonite
    Al
     
    11
    		[(OH)
     
    21
    		|(SO
     
    4
    		)
     
    3
    		|(PO
     
    4
    		)
     
    2
    		] · 16H
     
    2
    		O
    22.3.14Weilerite
    22.3.15Tsumebite
    Pb
     
    2
    		Cu[OH|SO
     
    4
    		|PO
     
    4
    		]
    22.3.16Arsentsumebite
    Pb
     
    2
    		Cu[OH|SO
     
    4
    		|AsO
     
    4
    		]
    22.3.17Hinsdalite
    PbAl
     
    3
    		[(OH)
     
    6
    		|SO
     
    4
    		|PO
     
    4
    		]
    22.3.18Hidalgoite
    PbAl
     
    3
    		[(OH)
     
    6
    		|SO
     
    4
    		|AsO
     
    4
    		]
    22.3.19Orpheite
    PbAl
     
    3
    		[(OH)
     
    6
    		|(PO
     
    4
    		,SO
     
    4
    		)
     
    2
    		] (?)
    22.3.20Coconinoite
    Fe
    3+
    2
    		Al
     
    2
    		(UO
     
    2
    		)
     
    2
    		[(OH)
     
    2
    		|SO
     
    4
    		|(PO
     
    4
    		)
     
    4
    		] · 20H
     
    2
    		O
    22.3.21Sasaite
    (Al,Fe
    3+
     
    		)
     
    14
    		[(OH)
     
    7
    		|SO
     
    4
    		|(PO
     
    4
    		)
     
    11
    		] · 83H
     
    2
    		O
    22.3.22Tristramite
    (Ca,U,Fe)(PO
     
    4
    		,SO
     
    4
    		)·2H
     
    2
    		O
    22.3.23Corkite
    PbFe
     
    3
    		[(OH)
     
    6
    		|SO
     
    4
    		|PO
     
    4
    		]
    22.3.24Beudantite
    PbFe
     
    3
    		[(OH)
     
    6
    		|SO
     
    4
    		|AsO
     
    4
    		]
    22.3.25Diadochite
    Fe
    3+
    2
    		(PO
     
    4
    		)(SO
     
    4
    		)(OH) · 5H
     
    2
    		O
    22.3.26Sarmientite
    Fe
    3+
    2
    		[OH|SO
     
    4
    		|AsO
     
    4
    		] · 5H
     
    2
    		O
    22.3.27Bukovskýite
    Fe
    3+
    2
    		[OH|SO
     
    4
    		|AsO
     
    4
    		] · 7H
     
    2
    		O
    22.3.28Zýkaite
    Fe
    3+
    4
    		[OH|SO
     
    4
    		|(AsO
     
    4
    		)
     
    3
    		] · 15H
     
    2
    		O
    22.3.29Tooeleite
    Fe
    3+
    6
    		(AsO
     
    3
    		)
     
    4
    		(SO
     
    4
    		)(OH)
     
    4
    		· 4H
     
    2
    		O
    22.3.30Pitticite
    [Fe, SO
     
    4
    		, AsO
     
    4
    		, H
     
    2
    		O] ?
    22.3.31Xiangjiangite
    (Fe
    3+
     
    		,Al)(UO
     
    2
    		)
     
    4
    		[OH|(SO
     
    4
    		)
     
    2
    		|(PO
     
    4
    		)
     
    2
    		] · 22H
     
    2
    		O

    Other Names for Sanjuanite

    Synonyms:
    IMA1966-043
    Other Languages:
    German:Sanjuanit
    Spanish:Sanjuanita

    Other Information

    Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

    References for Sanjuanite

    Reference List:American Mineralogist (1968): 53: 1-8.

    Mineralogical Magazine (1989): 53: 385.

    Articles/Blogs about Sanjuanite

    Internet Links for Sanjuanite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Sanjuanite in the Natural History Museum (London) online catalogue
  • Sanjuanite details from Handbook of Mineralogy (PDF)
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    Localities for Sanjuanite

    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Argentina
     
    • San Juan
      • Pocito Department
    		MM 53 (1989), 385; HB4 (2000)
    Mineral and/or Locality
    Google
     
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