Hectorfloresite
A valid IMA mineral species
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About Hectorfloresite
Formula:
Na9(SO4)4(IO3)
Colour:
White
Lustre:
Adamantine
Hardness:
2
Specific Gravity:
2.80
Crystal System:
Monoclinic
Name:
Named in honor of Hector Flores Williams (1906 - 1984), Chilean economic geologist and professor, University of Chile, Santiago, Chile. He made important contributions to the understanding of Chilean mineral deposits while working for both government and industry.
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.
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.
Unique Identifiers
Mindat ID:
1840
Long-form identifier:
mindat:1:1:1840:7
GUID
(UUID V4):
(UUID V4):
fee9bb82-4ce9-4ecb-b1e5-a1cf4b3a8ff2
IMA Classification of Hectorfloresite
Classification of Hectorfloresite
7.BD.60
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
B : Sulfates (selenates, etc.) with additional anions, without H2O
D : With only large cations
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
32 : COMPOUND SULFATES
1 : Anhydrous Compound Sulfates
29.8
29 : Iodates
29 : Iodates
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Hfl | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Hectorfloresite
Adamantine
Transparency:
Transparent, Translucent
Colour:
White
Comment:
Colourless in transmitted light
Hardness:
2 on Mohs scale
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 Hectorfloresite
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.
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
r > v, barely discernible
Chemistry of Hectorfloresite
Mindat Formula:
Na9(SO4)4(IO3)
Elements listed:
Crystallography of Hectorfloresite
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)°
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 Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
3.880 Å | (100) |
2.700 Å | (80) |
2.788 Å | (30) |
1.942 Å | (20) |
4.69 Å | (15) |
6.17 Å | (10) |
1.680 Å | (10) |
1.5607 Å | (10) |
1.5533 Å | (10) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Near-surface Processes | |
25 : Evaporites (prebiotic) |
Type Occurrence of Hectorfloresite
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 Hectorfloresite
Other Language Names for Hectorfloresite
German:Hectorfloresit
Spanish:Hectorfloresita
Common Associates
Associated Minerals Based on Photo Data:
1 photo of Hectorfloresite associated with Thénardite | Na2SO4 |
Related Minerals - Strunz-mindat Grouping
7.BD. | Adanite | Pb2(Te4+O3)(SO4) |
7.BD. | Hasanovite | KNa(MoO2)(SO4)2 |
7.BD. | Evanichite | Pb6Cr3+(Cr6+O4)2(SO4)(OH)7FCl |
7.BD. | Kennygayite | [Pb4O2(OH)2](SO4) |
7.BD.05 | Sulphohalite | Na6(SO4)2FCl |
7.BD.10 | Galeite | Na15(SO4)5F4Cl |
7.BD.10 | Schairerite | Na21(SO4)7ClF6 |
7.BD.15 | Kogarkoite | Na3(SO4)F |
7.BD.20 | Caracolite | Na3Pb2(SO4)3Cl |
7.BD.20 | Cesanite | Na3Ca2(SO4)3(OH) |
7.BD.20 | Aiolosite | Na4Bi(SO4)3Cl |
7.BD.25 | Burkeite | Na6(CO3)(SO4)2 |
7.BD.30 | Hanksite | Na22K(SO4)9(CO3)2Cl |
7.BD.35 | Cannonite | Bi2(SO4)O(OH)2 |
7.BD.40 | Lanarkite | Pb2(SO4)O |
7.BD.45 | Grandreefite | Pb2(SO4)F2 |
7.BD.50 | Itoite | Pb3Ge4+(SO4)2O2(OH)2 |
7.BD.55 | Chiluite | Bi3Te6+Mo6+O10.5 |
7.BD.65 | Pseudograndreefite | Pb6(SO4)F10 |
7.BD.70 | Sundiusite | Pb10(SO4)O8Cl2 |
Other Information
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.
Internet Links for Hectorfloresite
mindat.org URL:
https://www.mindat.org/min-1840.html
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Please feel free to link to this page.
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References for Hectorfloresite
Reference List:
Ericksen, George E., Evans, Howard T., Jr.,, Mrose, Mary E., Mcgee, James J., Marinenko, John W., Konnert, Judith A. (1989) Mineralogical studies of the nitrate deposits of Chile: VI. Hectorfloresite. Na9(IO3)(SO4)4, a new saline mineral. American Mineralogist, 74 (9-10) 1207-1214
Localities for Hectorfloresite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Chile | |
| Robinson (1993) |
| Marta et al. (1996) +1 other reference |
| Ericksen et al. (1989) |
| collected by Reynaldo Contreira |
USA | |
| Livingston et al. (2005, December) |
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Pampa Rica, Antofagasta, Chile