Heklaite
A valid IMA mineral species
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About Heklaite
Formula:
KNaSiF6
Colour:
Colourless
Lustre:
Vitreous
Specific Gravity:
2.69 (Calculated)
Crystal System:
Orthorhombic
Name:
For the type locality.
Type Locality:
Type locality heklaite is the natural product of hydrofluoric acid-bearing volcanic fumarole gases reacting with feldspar in volcanic rock. The much finer heklaite crystals from Polk County, Florida, are an accidental synthetic in gypsum industrial waste piles, a product of reaction between clay minerals and the hydrofluoric acid-rich byproducts of superphosphate fertilizer production.
Unique Identifiers
Mindat ID:
39218
Long-form identifier:
mindat:1:1:39218:3
GUID
(UUID V4):
(UUID V4):
afc98283-17e2-4555-8077-62ca10a8671f
IMA Classification of Heklaite
Approved
Approval year:
2008
Classification of Heklaite
3.CH.30
3 : HALIDES
C : Complex halides
H : Silicofluorides
3 : HALIDES
C : Complex halides
H : Silicofluorides
11.5.8.
11 : HALIDE COMPLEXES
5 : AmBX6
11 : HALIDE COMPLEXES
5 : AmBX6
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 |
---|---|---|
Hek | 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 Heklaite
Chemistry of Heklaite
Mindat Formula:
KNaSiF6
Elements listed:
Crystallography of Heklaite
Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pnma
Cell Parameters:
a = 9.3370(9) Å, b = 5.5022(5) Å, c = 9.795(1) Å
Ratio:
a:b:c = 1.697 : 1 : 1.78
Unit Cell V:
503.43 ų
Z:
4
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0014361 | Heklaite | Fischer J, Kramer V (1991) Crystal structure of KNaSiF_6_ Materials Research Bulletin 26 925-930 | 1991 | synthetic | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
4.33 Å | (53) |
4.26 Å | (56) |
3.40 Å | (49) |
3.37 Å | (47) |
3.34 Å | (100) |
2.251 Å | (27) |
2.050 Å | (52) |
2.016 Å | (29) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 7: Great Oxidation Event | <2.4 |
45b : [Other oxidized fumarolic minerals] |
Type Occurrence of Heklaite
General Appearance of Type Material:
Fine-grained mass of micrometre- to submicrometre-sized crystals.
Place of Conservation of Type Material:
Icelandic Institute of Natural History, Reykjavík, Iceland (NI 15513); Museum "C.L. Garavelli", Dipartimento Geomineralogico, Universita di Bari, Italy (9/nm-V28).
Geological Setting of Type Material:
In fumarolic encrustations.
Associated Minerals at Type Locality:
Synonyms of Heklaite
Related Minerals - Strunz-mindat Grouping
3.CH.05 | Malladrite | Na2[SiF6] |
3.CH.10 | Bararite | (NH4)2[SiF6] |
3.CH.15 | Cryptohalite | (NH4)2[SiF6] |
3.CH.15 | Hieratite | K2[SiF6] |
3.CH.20 | Demartinite | K2[SiF6] |
3.CH.25 | Knasibfite | K3Na4[SiF6]3[BF4] |
Fluorescence of Heklaite
Non-fluorescent.
Other Information
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 Heklaite
mindat.org URL:
https://www.mindat.org/min-39218.html
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References for Heklaite
Localities for Heklaite
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.
Iceland (TL) | |
| Garavelli et al. (2010) |
Italy | |
| Russo et al. (2022) |
USA | |
| Isaias Casanova specimens +1 other reference |
RRUFF Database Specimen I.D RO90034 | |
| Hon |
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Polk County Mine, Polk County, Florida, USA