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Fuenzalidaite

Formula:
K
 
6
(Na,K)
 
4
Na
 
6
Mg
 
10
(SO
 
4
)
 
12
(IO
 
3
)
 
12
·12H
 
2
O
System:TrigonalColour:Colourless to pale yellow
Lustre:VitreousHardness:2 - 3
Name:Named after Humberto Fuenzalida, Director, School of Geology, Universite of Chile.


Carlosruizite-Fuenzalidaite Series.

Occurs in veins and veinlets of white nitrate ore (Caliche Blanco).

Classification of Fuenzalidaite

IMA status:Approved
Strunz 8th edition ID:6/D.16-50
Nickel-Strunz 10th (pending) edition ID:7.DG.40

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
G : With large and medium-sized cations; with NO3, CO3, B(OH)4, SiO4 or IO3
Dana 7th edition ID:23.1.2.1
Dana 8th edition ID:23.1.2.1

23 : COMPOUND IODATES
1 : Miscellaneous
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Type Occurrence of Fuenzalidaite

Type Locality:Oficina Santa Luisa, Canchas, Antofagasta Province, Antofagasta Region, Chile
Year of Discovery:1994

Physical Properties of Fuenzalidaite

Lustre:Vitreous
Colour:Colourless to pale yellow
Hardness (Mohs):2 - 3

Crystallography of Fuenzalidaite

Crystal System:Trigonal
Cell Parameters:a = 9.46Å, c = 27.33Å
Ratio:a:c = 1 : 2.889
Unit Cell Volume:V 2,118.13 ų (Calculated from Unit Cell)

Optical Data of Fuenzalidaite

Type:Uniaxial (-)
RI values: nω = 1.622 nε = 1.615
Maximum Birefringence:δ = 0.007

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

Chemical Properties of Fuenzalidaite

Formula:
K
 
6
(Na,K)
 
4
Na
 
6
Mg
 
10
(SO
 
4
)
 
12
(IO
 
3
)
 
12
·12H
 
2
O
Essential elements:H, I, K, Mg, Na, O, S
All elements listed in formula:H, I, K, Mg, Na, O, S

Relationship of Fuenzalidaite to other Species

Series:Forms a series with Carlosruizite (see here)
Related Minerals - Nickel-Strunz Grouping):

- +
7.DG.05Darapskite
Na
 
3
NO
 
3
SO
 
4
·H
 
2
O
7.DG.10Clinoungemachite
(Na, K, Fe, SO
 
4
)
7.DG.10Humberstonite
Na
 
7
K
 
3
Mg
 
2
(SO
 
4
)
 
6
(NO
 
3
)
 
2
·6H
 
2
O
7.DG.10Ungemachite
K
 
3
Na
 
8
Fe(SO
 
4
)
 
6
(NO
 
3
)
 
2
·6H
 
2
O
7.DG.15Bentorite
Ca
 
6
(Cr
3+
 
,Al)
 
2
[(OH)
 
4
|SO
 
4
]
 
3
 · 26H
 
2
O
7.DG.15Charlesite
Ca
 
6
(Al,Si)
 
2
[(OH,O)
 
12
|B(OH)
 
4
|(SO
 
4
)
 
2
] · 26H
 
2
O
7.DG.15Ettringite
Ca
 
6
Al
 
2
[(OH)
 
4
|SO
 
4
]
 
3
 · 26H
 
2
O
7.DG.15Jouravskite
Ca
 
6
Mn
3+
2
[(OH)
 
4
|(SO
 
4
,CO
 
3
)]
 
3
 · 26H
 
2
O
7.DG.15Sturmanite
Ca
 
6
(Fe
3+
 
,Al,Mn
3+
 
)
 
2
[(OH)
 
12
|B(OH)
 
4
|(SO
 
4
)
 
2
] · 25H
 
2
O
7.DG.15Thaumasite
Ca
 
3
[CO
 
3
|SO
 
4
|Si(OH)
 
6
] · 12H
 
2
O
7.DG.15Carraraite
Ca
 
3
Ge(OH)
 
6
(SO
 
4
)(CO
 
3
)·12H
 
2
O
7.DG.15Buryatite
Ca
 
3
(Si,Fe,Al)[SO
 
4
][B(OH)
 
4
](OH)
 
5
O•
 
12
H
 
2
O
7.DG.15Korkinoite
7.DG.20Rapidcreekite
Ca
 
2
[CO
 
3
|SO
 
4
] · 4H
 
2
O
7.DG.25Tatarskite
Ca
 
6
Mg
 
2
(SO
 
4
)
 
2
(CO
 
3
)
 
2
Cl
 
4
(OH)
 
4
·7H
 
2
O
7.DG.25Chelyabinskite
(Ca,Mg)
 
3
[(SO
 
4
,CO
 
3
)
 
2
|Si(OH)
 
6
] · 9H
 
2
O (?)
7.DG.30Nakauriite
Cu
 
8
[(OH)
 
6
|CO
 
3
|(SO
 
4
)
 
4
] · 48H
 
2
O
7.DG.35Chessexite
(Na,K)
 
4
Ca
 
2
(Mg,Zn)
 
3
Al
 
8
[(SO
 
4
)
 
10
|(SiO
 
4
)
 
2
] · 40H
 
2
O
7.DG.40Carlosruizite
K
 
6
(Na,K)
 
4
Na
 
6
Mg
 
10
(SeO
 
4
)
 
12
(IO
 
3
)
 
12
·12H
 
2
O
Related Minerals - Dana Grouping):

- +
23.1.2.2Carlosruizite
K
 
6
(Na,K)
 
4
Na
 
6
Mg
 
10
(SeO
 
4
)
 
12
(IO
 
3
)
 
12
·12H
 
2
O

Other Names for Fuenzalidaite

Synonyms:
IMA1993-021
Other Languages:
German:Fuenzalidait
Russian:Фуэнцалидаит
Spanish:Fuenzalidaita

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 Fuenzalidaite

Reference List:New Minerals (1997), New Minerals 1990-1994.

American Mineralogist: 79: 1003-1008.

Mineralogical Record: 27: 202-203.

Articles/Blogs about Fuenzalidaite

Internet Links for Fuenzalidaite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
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  • Fuenzalidaite details from Handbook of Mineralogy (PDF)
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    Localities for Fuenzalidaite

    (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.
    Chile
     
    • Antofagasta Region
      • Antofagasta Province
        • Canchas
    		NM 90-94 (1997)
      • Tocopilla Province
        • Pedro de Valdivia
    		Pueyo, J. J., Chong, G. & Vega, M. (1998): Mineralogy and parental brine evolution in the Pedro de Valdivia nitrate deposit, Antofagasta, Chile. Revista Geologica de Chile 25, 3-15. (in Spanish)
    Mineral and/or Locality
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