IMPORTANT MESSAGE. We need your support now to keep mindat.org running. Click here to find out why.
Log InRegister
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for Educators
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
StatisticsThe ElementsUsersBooks & MagazinesMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Fuenzalidaite

This page is currently not sponsored. Click here to sponsor this page.
Hide all sections | Show all sections

About FuenzalidaiteHide

Humberto Fuenzalida
Formula:
K6(Na,K)4Na6Mg10(SO4)12(IO3)12 · 12H2O
Colour:
Colourless to pale yellow
Lustre:
Vitreous
Hardness:
2 - 3
Crystal System:
Trigonal
Name:
Named by Judith A. Konnert, Howard T. Evans, Jr., James J. McGee, and George E. Ericksen in 1994 in honor of Humberto Fuenzalida Villegas (27 March 1904, Curicó, Chile - 24 February 1966, Santiago, Chile), geographer, geologist, paleontologist, academic and naturalist. He was director of the National Museum of Natural History between 1948 and 1964. He founded the Chilean School of Geology within the Faculty of Physical Sciences and Mathematics at the University of Chile (and was the first Director) and the Institute of Geography at the Faculty of Education at the same university. He also co-founded the Antarctic Institute of Chile (INACH) and the Geological Society of Chile.
Isostructural with:
Carlosruizite-Fuenzalidaite Series. The S analogue of carlosruizite.

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

The structure is based on two complex slabs, normal to the c axis; each slab consists of a double layer formed by trigonal-pyramidal iodate groups, bounded at the top and bottom by layers of SO4 groups. The layers are separated by K, with Na and Mg helding the layer complex together. The structure somewhat resembles that of alunite group members.


Classification of FuenzalidaiteHide

Approved
First Published:
1994
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 ed.:
23.1.2.1
23.1.2.1

23 : COMPOUND IODATES
1 : Miscellaneous

Physical Properties of FuenzalidaiteHide

Vitreous
Transparency:
Transparent
Colour:
Colourless to pale yellow
Hardness:
2 - 3 on Mohs scale
Tenacity:
Brittle

Optical Data of FuenzalidaiteHide

Type:
Uniaxial (-)
RI values:
nω = 1.622 nε = 1.615
Max Birefringence:
δ = 0.007
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of FuenzalidaiteHide

Formula:
K6(Na,K)4Na6Mg10(SO4)12(IO3)12 · 12H2O
IMA Formula:
K3Na5Mg5(IO3)6(SO4)6 · 6H2O

Crystallography of FuenzalidaiteHide

Crystal System:
Trigonal
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Space Group:
P3c1
Cell Parameters:
a = 9.4643(4) Å, c = 27.336(6) Å
Ratio:
a:c = 1 : 2.888
Unit Cell V:
2,120.52 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
13.67 (50)
7.05 (40)
3.927 (100)
3.023 (41)
2.681 (33)

Type Occurrence of FuenzalidaiteHide

General Appearance of Type Material:
thin, euhedral, platy crystals with hexagonal outline, usually less than 200 microns in diameter and 20 microns thick
Geological Setting of Type Material:
veins and veinlets of "caliche blanco"
Associated Minerals at Type Locality:

Synonyms of FuenzalidaiteHide

Other Language Names for FuenzalidaiteHide

Relationship of Fuenzalidaite to other SpeciesHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Nitratine2 photos of Fuenzalidaite associated with Nitratine on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

7.DG.05DarapskiteNa3(SO4)(NO3) · H2OMon. 2/m
7.DG.10Clinoungemachite(Na, K, Fe, SO4)Mon. 2/m
7.DG.10HumberstoniteNa7K3Mg2(SO4)6(NO3)2 · 6H2OTrig. 3 : R3
7.DG.10UngemachiteK3Na8Fe(SO4)6(NO3)2 · 6H2OTrig. 3 : R3
7.DG.15BentoriteCa6(Cr3+,Al)2(SO4)3(OH)12 · 26H2OHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
7.DG.15CharlesiteCa6(Al,Si)2(SO4)2[B(OH)4](OH,O)12 · 26H2OTrig. 3m : P3 1c
7.DG.15EttringiteCa6Al2(SO4)3(OH)12 · 26H2OTrig. 3m : P3 1c
7.DG.15JouravskiteCa3Mn4+(SO4)(CO3)(OH)6 · 12H2OHex.
7.DG.15SturmaniteCa6(Fe3+,Al,Mn3+)2(SO4)2[B(OH)4](OH)12 · 25H2OTrig. 3m : P3 1c
7.DG.15ThaumasiteCa3(SO4)[Si(OH)6](CO3) · 12H2OHex. 6 : P63
7.DG.15CarraraiteCa3(SO4)[Ge(OH)6](CO3) · 12H2OHex.
7.DG.15BuryatiteCa3(Si,Fe,Al)(SO4)[B(OH)4]O(OH)5 · 12H2O
7.DG.20RapidcreekiteCa2(SO4)(CO3) · 4H2OOrth.
7.DG.20KorkinoiteCa4(SO4)2(CO3)2 · 9(H2O)Orth. mmm (2/m 2/m 2/m) : Pmmm
7.DG.25TatarskiteCa6Mg2(SO4)2(CO3)2(OH)4Cl4 · 7H2OOrth.
7.DG.30NakauriiteCu8(SO4)4(CO3)(OH)6 · 48H2OOrth.
7.DG.35Chessexite(Na,K)4Ca2(Mg,Zn)3Al8(SO4)10(SiO4)2 · 40H2OOrth.
7.DG.40CarlosruiziteK6(Na,K)4Na6Mg10(SeO4)12(IO3)12 · 12H2OTrig. 3m (3 2/m) : P3c1
7.DG.45Chelyabinskite(Ca,Mg)3(SO4,CO3)2[Si(OH)6] · 9H2O (?)Orth.

Related Minerals - Dana Grouping (8th Ed.)Hide

23.1.2.2CarlosruiziteK6(Na,K)4Na6Mg10(SeO4)12(IO3)12 · 12H2OTrig. 3m (3 2/m) : P3c1

Other InformationHide

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

References for FuenzalidaiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Konnert, J.A., Evans, H.T.Jr., McGee, J.J., Ericksen, G.E. (1994) Mineralogical studies of the nitrate deposits of Chile: VII. Two new saline minerals with the composition K6(Na,K)4Na6Mg10(XO4)12(IO3)12.l2H2O: Fuenzalidaite (X = S) and carlosruizite (X = Se). American Mineralogist: 79: 1003-1008.
Mandarino, J.A. (1996) Abstracts of New Mineral Descriptions. Mineralogical Record: 27: 202-203.
Mandarino J.A. (1997) New Minerals 1990-1994. The Mineralogical Record Inc.

Internet Links for FuenzalidaiteHide

Localities for FuenzalidaiteHide

ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Chile (TL)
 
  • 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)
  • Tarapacá Region
    • El Tamarugal Province
      • Pozo Almonte
collected by Reynaldo Contreira
Personally collected by Reynaldo Contreira in 2006
Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2018, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: October 23, 2018 10:56:15 Page generated: October 22, 2018 12:42:44
Go to top of page