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Sarmientite

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Big Photo

Kotzebue, Northwest Arctic Borough, Alaska, USA
© 2008, JGW




Formula:
Fe
3+
2
(AsO
 
4
)(SO
 
4
)(OH) · 5H
 
2
O
System:MonoclinicColour:Light yellow-orange
Member of:Sanjuanite-Destinezite Group
Name:
Named for Domingo Faustino Sarmiento (1811-1888), Argentine educator & political leader (8th president), founder of the Cordoba Academy of Science.


Sanjuanite-Destinezite Group. Arsenate analogue of Diadochite

An uncommon secondary mineral occurring in oxidized pyritic veins in diabase.

Classification of Sarmientite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered" 1968
Strunz 8th edition ID:7/D.05-30
Nickel-Strunz 10th (pending) edition ID:8.DB.35

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:43.5.1.1

43 : COMPOUND PHOSPHATES, ETC.
5 : Hydrated Compound Phosphates, etc·, Containing Hydroxyl or Halogen
Hey's CIM Ref.:22.3.26

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

Type Locality:Santa Elena Mine, La Alcaparrosa, San Juan, Argentina
Place of Conservation of Type Material:The Academy of Natural Sciences of Philadelphia?
Year of Discovery:1941
Geological Setting of type material:Fe-sulfate gossan over pyrite vein.
Associated Minerals at type locality:
SzomolnokiteSzomolnokiteSlavíkiteGypsumFibroferrite
EpsomiteCopiapiteBotryogen

Physical Properties of Sarmientite

Lustre:Dull
Diaphaneity (Transparency):Translucent
Colour:Light yellow-orange
Density (measured):2.58 g/cm3
Density (calculated):2.58 g/cm3

Crystallography of Sarmientite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/b {P1 1 21/b} {P21/c} {P1 21/c 1} {P21/a}
Space Group Setting:P21/c
Cell Parameters:a = 6.55Å, b = 18.55Å, c = 9.70Å
β = 97.65°
Ratio:a:b:c = 0.353 : 1 : 0.523
Unit Cell Volume:V 1,168.08 ų (Calculated from Unit Cell)
Z:4
Morphology:Crystals prismatic [001] and flattened {010}, exhibiting {010}, {110} and {011}. Microcrystalline (to 20 μm) forming nodular masses as aggregates.

Optical Data of Sarmientite

Type:Biaxial (+)
RI values: nα = 1.628 nβ = 1.635 nγ = 1.698
2V:Measured: 38° , Calculated: 38°
Maximum Birefringence:δ = 0.070

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:weak to distinct

Chemical Properties of Sarmientite

Formula:
Fe
3+
2
(AsO
 
4
)(SO
 
4
)(OH) · 5H
 
2
O
Essential elements:As, Fe, H, O, S
All elements listed in formula:As, Fe, H, O, S

Relationship of Sarmientite to other Species

Member of:Sanjuanite-Destinezite Group
Other Members of Group:

- +
Destinezite
Fe
3+
2
(PO
 
4
)(SO
 
4
)(OH) · 6H
 
2
O
Sanjuanite
Al
 
2
(PO
 
4
)(SO
 
4
)(OH) · 9H
 
2
O
Zýkaite
Fe
3+
4
(AsO
 
4
)
 
3
(SO
 
4
)(OH) · 15H
 
2
O
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
(PO
 
4
)(SO
 
4
)(OH) · 6H
 
2
O
8.DB.10Vashegyite
Al
 
11
(PO
 
4
)
 
9
(OH)
 
6
 · 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(PO
 
4
)
 
2
(OH) · 6H
 
2
O
8.DB.25Mitryaevaite
Al
 
6
(PO
 
4
)((P,S)O
 
3
(OH,O))
 
2
F
 
2
(OH)
 
2
 · 14.5H
 
2
O
8.DB.30Sanjuanite
Al
 
2
(PO
 
4
)(SO
 
4
)(OH) · 9H
 
2
O
8.DB.40Bukovskýite
Fe
3+
2
(AsO
 
4
)(SO
 
4
)(OH) · 9H
 
2
O
8.DB.45Zýkaite
Fe
3+
4
(AsO
 
4
)
 
3
(SO
 
4
)(OH) · 15H
 
2
O
8.DB.50Giniite
Fe
2+
 
Fe
3+
4
(PO
 
4
)
 
3
(OH)
 
5
 · 2H
 
2
O
8.DB.55Sasaite
(Al,Fe
3+
 
)
 
14
(PO
 
4
)
 
11
(SO
 
4
)(OH)
 
7
 · 83H
 
2
O
8.DB.60Mcauslanite
HFe
2+
3
Al
 
2
(PO
 
4
)
 
4
F · 18H
 
2
O
8.DB.65Goldquarryite
CuCd
 
2
Al
 
3
(PO
 
4
)
 
4
F
 
2
(H
 
2
O,F)
 
2
 · 10H
 
2
O
8.DB.70Birchite
Cd
 
2
Cu
 
2
(PO
 
4
)
 
2
(SO
 
4
) · 5H
 
2
O
8.DB.75Braithwaiteite
NaCu
 
5
Ti
 
2
Sb
 
2
(AsO
 
4
)(HAsO
 
4
)
 
2
O
 
2
 · 8H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
22.3.1Parnauite
Cu
 
9
(AsO
 
4
)
 
2
(SO
 
4
)(OH)
 
10
 · 7H
 
2
O
22.3.2Ardealite
Ca
 
2
(HPO
 
4
)(SO
 
4
) · 4H
 
2
O
22.3.3Machatschkiite
(Ca,Na)
 
6
(AsO
 
4
)(HAsO
 
4
)
 
3
(PO
 
4
,SO
 
4
) · 15H
 
2
O
22.3.4Clinotyrolite
Ca
 
2
Cu
 
9
(AsO
 
4
,SO
 
4
)
 
4
(OH,O)
 
10
 · 10H
 
2
O
22.3.5Peisleyite
Na
 
2
Al
 
9
[(P,S)O
 
4
]
 
8
(OH)
 
6
•28H
 
2
O
22.3.6Chalcophyllite
Cu
 
18
Al
 
2
(SO
 
4
)
 
3
(AsO
 
4
)
 
3
(OH)
 
27
 · 33H
 
2
O
22.3.7Woodhouseite
CaAl
 
3
(PO
 
4
)(SO
 
4
)(OH)
 
6
22.3.8Schlossmacherite
(H
 
3
O,Ca)Al
 
3
(SO
 
4
,AsO
 
4
)
 
2
(OH)
 
6
22.3.9Svanbergite
SrAl
 
3
(PO
 
4
)(SO
 
4
)(OH)
 
6
22.3.10Kemmlitzite
(Sr,Ce)Al
 
3
(AsO
 
4
)(SO
 
4
)(OH)
 
6
22.3.11Sanjuanite
Al
 
2
(PO
 
4
)(SO
 
4
)(OH) · 9H
 
2
O
22.3.12Kribergite
Al
 
5
(PO
 
4
)
 
3
(SO
 
4
)(OH)
 
4
 · 4H
 
2
O
22.3.13Hotsonite
Al
 
11
(SO
 
4
)
 
3
(PO
 
4
)
 
2
(OH)
 
21
 · 16H
 
2
O
22.3.14Weilerite
22.3.15Tsumebite
Pb
 
2
Cu(PO
 
4
)(SO
 
4
)(OH)
22.3.16Arsentsumebite
Pb
 
2
Cu(AsO
 
4
)(SO
 
4
)(OH)
22.3.17Hinsdalite
PbAl
 
3
(PO
 
4
)(SO
 
4
)(OH)
 
6
22.3.18Hidalgoite
PbAl
 
3
(AsO
 
4
)(SO
 
4
)(OH)
 
6
22.3.19Orpheite
22.3.20Coconinoite
Fe
3+
2
Al
 
2
(UO
 
2
)
 
2
(PO
 
4
)
 
4
(SO
 
4
)(OH)
 
2
 · 20H
 
2
O
22.3.21Sasaite
(Al,Fe
3+
 
)
 
14
(PO
 
4
)
 
11
(SO
 
4
)(OH)
 
7
 · 83H
 
2
O
22.3.22Tristramite
(Ca,U,Fe)(PO
 
4
,SO
 
4
) · 2H
 
2
O
22.3.23Corkite
PbFe
 
3
(PO
 
4
)(SO
 
4
)(OH)
 
6
22.3.24Beudantite
PbFe
 
3
(AsO
 
4
)(SO
 
4
)(OH)
 
6
22.3.25Diadochite
Fe
3+
2
(PO
 
4
)(SO
 
4
)(OH) · 5H
 
2
O
22.3.27Bukovskýite
Fe
3+
2
(AsO
 
4
)(SO
 
4
)(OH) · 9H
 
2
O
22.3.28Zýkaite
Fe
3+
4
(AsO
 
4
)
 
3
(SO
 
4
)(OH) · 15H
 
2
O
22.3.29Tooeleite
Fe
3+
6
(As
3+
 
O
 
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
(PO
 
4
)
 
2
(SO
 
4
)
 
2
(OH) · 22H
 
2
O

Other Names for Sarmientite

Other Languages:
German:Sarmientit
Spanish:Sarmientita

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 Sarmientite

Reference List:

- +
Angelelli, V. & Gordon, S.G. (1941); Notulae Naturae, Academy of Sciences, Philadelphia: no. 92.

Angelelli and Gordon (1942) Publ. Inst. de Fisiog. y Geol., Univ. Nac. del Litoral, Argentina: no. XII.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 1013-1014.

de Abeledo, M.E.J. & de Benyacar, M.A.R. (1968), American Mineralogist: 53: 2077-2082.

Internet Links for Sarmientite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
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    • Localities for Sarmientite

    The 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.
    Hide Locality List
    (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
      • La Alcaparrosa
    		Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 480, 609, 1014.
    Morocco
     
    • Souss-Massa-Draâ Region
      • Ouarzazate Province
        • Tazenakht
          • Bou Azer District (Bou Azzer District)
    		M.E. Ciriotti collection [S. Möckel 2010 - EDX+PXRD]
    South Africa
     
    • KwaZulu-Natal Province
    		Minerals of South Africa
    USA
     
    • Alaska
      • Northwest Arctic Borough
    		Excalibur mineral specimen
    • Nevada
      • Humboldt Co.
    		NBMG Spec. Pub. 31 Minerals of Nevada
      • Nye Co.
        • Manhattan District
          • Manhattan
    		NBMG Spec. Pub. 31 Minerals of Nevada
    Mineral and/or Locality
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