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Hectorfloresite

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About HectorfloresiteHide

Formula:
Na9(SO4)4(IO3)
Colour:
White
Lustre:
Adamantine
Hardness:
2
Specific Gravity:
2.80
Crystal System:
Monoclinic
Name:
For Chilean geologist Hector Flores (1906-84).
Second sulphate-iodate mineral, the other being fuenzalidaite. One of two double salts in the NaIO3-Na2SO4-H2O system (at least at the time of the original publication).

The structure is based on tha of the type I Na2SO4 phase, with 10 times its volume. Hectorfloresite has an ordered hexagonal substructure, with every fifth sulphate group replaced by iodate.


Classification of HectorfloresiteHide

Approved
Approval Year:
1987
7.BD.60

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
B : Sulfates (selenates, etc.) with additional anions, without H2O
D : With only large cations
32.1.2.1

32 : COMPOUND SULFATES
1 : Anhydrous Compound Sulfates
29.8

29 : Iodates

Physical Properties of HectorfloresiteHide

Adamantine
Transparency:
Transparent, Translucent
Colour:
White
Comment:
Colourless in transmitted light
Hardness:
Comment:
ca. 2
Cleavage:
None Observed
Parting:
irregular, perpendicular and parallel to elongation
Fracture:
Conchoidal
Density:
2.80(3) g/cm3 (Measured)    2.90 g/cm3 (Calculated)

Optical Data of HectorfloresiteHide

Type:
Biaxial (-)
RI values:
nα = 1.493(2) nβ = 1.521(2) nγ = 1.523(2)
2V:
Measured: 26° (2), Calculated: 28°
Max Birefringence:
δ = 0.030
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
r > v, barely discernible

Chemical Properties of HectorfloresiteHide

Formula:
Na9(SO4)4(IO3)
IMA Formula:
Na9(IO3)(SO4)4

Crystallography of HectorfloresiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/a
Cell Parameters:
a = 18.775(4) Å, b = 6.9356(7) Å, c = 14.239(2) Å
β = 108.91(2)°
Ratio:
a:b:c = 2.707 : 1 : 2.053
Unit Cell V:
1754 ų
Z:
4
Morphology:
Observed forms: {100}, {001}, {212}
Twinning:
multiple, contact, || [010], very often, on {001}, {601}, and {604} twin planes, giving a pseudohexagonal outline

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.880 (100)
2.700 (80)
2.788 (30)
1.942 (20)
4.69 (15)
6.17 (10)
1.680 (10)
1.5607 (10)
1.5533 (10)

Type Occurrence of HectorfloresiteHide

General Appearance of Type Material:
tiny pseudohexagonal prisms, usually below 1 mm in length and 0.2 mm in diameter
Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA
Geological Setting of Type Material:
cavities in dense nitrate ore, that is a saline-cemented silt, sand, and small rock fragments; the cavities are dessication fissures, 30 cm in diameter; hectorfloresite is intergrown with glauberite and overgrowths on glauberite and halite
Associated Minerals at Type Locality:

Synonyms of HectorfloresiteHide

Other Language Names for HectorfloresiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Thénardite1 photo of Hectorfloresite associated with Thénardite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

7.BD.05SulphohaliteNa6(SO4)2FClIso. m3m (4/m 3 2/m)
7.BD.05SulfohaliteNa6(SO4)2FCl
7.BD.10GaleiteNa15(SO4)5F4ClTrig.
7.BD.10SchaireriteNa21(SO4)7ClF6Trig. 3m (3 2/m)
7.BD.15KogarkoiteNa3(SO4)FMon.
7.BD.20CaracoliteNa3Pb2(SO4)3ClMon.
7.BD.20CesaniteNa3Ca2(SO4)3(OH)Hex.
7.BD.20AiolositeNa4Bi(SO4)3ClHex. 6/m : P63/m
7.BD.25BurkeiteNa6(CO3)(SO4)2Orth.
7.BD.30HanksiteNa22K(SO4)9(CO3)2ClHex. 6/m : P63/m
7.BD.35CannoniteBi2(SO4)O(OH)2Mon. 2/m : P21/b
7.BD.40LanarkitePb2(SO4)OMon. 2/m : B2/m
7.BD.45GrandreefitePb2(SO4)F2Mon. 2/m
7.BD.50ItoitePb3Ge4+(SO4)2O2(OH)2Orth. mmm (2/m 2/m 2/m) : Pnma
7.BD.55ChiluiteBi3Te6+Mo6+O10.5Hex.
7.BD.65PseudograndreefitePb6(SO4)F10Orth. 2 2 2 : F2 2 2
7.BD.70SundiusitePb10(SO4)O8Cl2Mon.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

29.1SalesiteCu(IO3)(OH)Orth. mmm (2/m 2/m 2/m) : Pnma
29.2BellingeriteCu3(IO3)6 · 2H2OTric. 1 : P1
29.3LautariteCa(IO3)2Mon. 2/m : P21/b
29.4BrüggeniteCa(IO3)2 · H2OMon.
29.5DietzeiteCa2(IO3)2(CrO4) · H2OMon. 2/m : P21/b
29.6SeeligeritePb3(IO3)OCl3Orth. mm2 : Cmm2
29.7SchwartzembergitePb5H2(IO2)O4Cl3Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm

Other InformationHide

IR Spectrum:
confirms the presence of IO3- and SO42- anions
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 HectorfloresiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Ericksen, G.E., Evans, H.T., Jr., Mrose, M.E., McGee, J.J., Marinenko, J.W., Konnert, J.A. (1989): Mineralogical studies of the nitrate deposits of Chile: VI. Hectorfloresite, Na9(IO3)(SO4)4, a new saline mineral. American Mineralogist: 74: 1207-1214.
Anthony, J.W., Bideaux, R.A., Bladh, K.W. and Nichols, M.C., Eds. Handbook of Mineralogy, Mineralogical Society of America, Chantilly, VA 20151-1110, USA. http://www.handbookofmineralogy.org/ (2016)

Internet Links for HectorfloresiteHide

Localities for HectorfloresiteHide

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 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
 
  • Antofagasta Region
Robinson, G.W. (1993): What's New in Minerals ? Mineralogical Record 24: 49
    • 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
      • Oficina Victoria
Amer. Min.:74:1207-1214.
      • Pozo Almonte
collected by Reynaldo Contreira
Mineral and/or Locality  
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