Hectorfloresite
A valid IMA mineral species
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About Hectorfloresite
Hector Flores Williams
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
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 for Standard |
|---|---|---|
| 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
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate
Dispersion:
r > v, barely discernible
Chemistry of Hectorfloresite
Mindat Formula:
Na9(SO4)4(IO3)
Element Weights:
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
Common Associates
Associations Based on Photo Data:
| 1 photo of Hectorfloresite associated with Thénardite | Na2SO4 |
Related Minerals - Strunz-mindat Grouping
| 7.BD. | Hasanovite | KNa(MoO2)(SO4)2 |
| 7.BD. | Kennygayite | [Pb4O2(OH)2](SO4) |
| 7.BD. | Adanite | Pb2(Te4+O3)(SO4) |
| 7.BD. | Cadsulfohite | Cd2(SO4)(OH)2 |
| 7.BD. | Hyblerite | Pb4Bi2(SO4)2(CO3)O4 |
| 7.BD. | Zanelliite | PbCu9[AsO3.5(OH)0.5]2(AsO4)2(OH)9(H2O)3 |
| 7.BD. | Evanichite | Pb6Cr3+(Cr6+O4)2(SO4)(OH)7FCl |
| 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 | Aiolosite | Na4Bi(SO4)3Cl |
| 7.BD.20 | Caracolite | Na3Pb2(SO4)3Cl |
| 7.BD.20 | Cesanite | Na3Ca2(SO4)3(OH) |
| 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
Localities for Hectorfloresite
Showing 5 localities.
symbol to view information about a locality.
The 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).
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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Cala Cala mine, Pozo Almonte, Tamarugal Province, Tarapacá, Chile