Steklite
A valid IMA mineral species
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About Steklite
Formula:
KAl(SO4)2
Colour:
colorless
Lustre:
Vitreous
Hardness:
2½
Specific Gravity:
2.792 (Calculated)
Crystal System:
Trigonal
Name:
From the Russian word стекло (steklo) for glass as an allusion to the visual appearance of aggregates of the mineral formed around vents of a burning coal heap (coal mine N 47 near Kopeisk, South Urals, Russia).
K-analogue of godovikovite.
Found on a burnt coal dump, so first considered to be anthropogenic and not to be a true mineral.
Steklite is a natural analog of the synthetic KAl(SO4)2 studied by Manoli et al (1970).
Found on a burnt coal dump, so first considered to be anthropogenic and not to be a true mineral.
Steklite is a natural analog of the synthetic KAl(SO4)2 studied by Manoli et al (1970).
Unique Identifiers
Mindat ID:
40128
Long-form identifier:
mindat:1:1:40128:7
GUID
(UUID V4):
(UUID V4):
07849db3-74b5-4363-9bd9-828a33aa2d77
IMA Classification of Steklite
Approved
Approval year:
2011
Approval history:
First published without approval in 1995, then approved in 2011 from a natural occurrence (Yadovitaya fumarole, Tolbachik volcano).
Type description reference:
Murashko, M. N., Pekov, I. V., Krivovichev, S. V., Chernyatyeva, A. P., Yapaskurt, V. O., Zadov, A. E., Zelensky, M. E. (2013) Steklite, KAl(SO4)2: A finding at the Tolbachik Volcano, Kamchatka, Russia, validating its status as a mineral species and crystal structure. Geology of Ore Deposits, 55 (7) 594-600 doi:10.1134/s1075701513070088
Classification of Steklite
7.AC.20
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
A : Sulfates (selenates, etc.) without additional anions, without H2O
C : With medium-sized and large cations
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
A : Sulfates (selenates, etc.) without additional anions, without H2O
C : With medium-sized and large cations
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 |
|---|---|---|
| Sek | 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 Steklite
Vitreous
Transparency:
Transparent
Colour:
colorless
Comment:
aggregates are white to grayish white
Streak:
white
Hardness:
2½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
parallel to {001}
parallel to {001}
Fracture:
Micaceous
Comment:
Fracture is lamellar while very thin flakes are flexible.
Density:
2.792 g/cm3 (Calculated)
Optical Data of Steklite
Type:
Uniaxial (-)
RI values:
nω = 1.546(2) nε = 1.533(3)
Max Birefringence:
δ = 0.013
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
Pleochroism:
Non-pleochroic
Chemistry of Steklite
Mindat Formula:
KAl(SO4)2
Elements listed:
Crystallography of Steklite
Crystal System:
Trigonal
Class (H-M):
3 2 - Trapezohedral
Space Group:
P3 2 1
Cell Parameters:
a = 4.7281(3) Å, c = 7.9936(5) Å
Ratio:
a:c = 1 : 1.691
Unit Cell V:
154.76 ų (Calculated from Unit Cell)
Z:
1
Crystal Structure
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2x2x2 | 3x3x3 | 4x4x4
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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) |
|---|---|---|---|---|---|---|---|
| 0018101 | Steklite | Vegard L, Maurstad A (1928) Die Kristallstruktur der wasserfreien Alaune R'R'''(SO4)2 _cod_database_code 1011235 Skrifter utgitt av det Norske Videnskaps-Akademi i Oslo 1928 1-24 | 1928 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 8.02 Å | (34) |
| 4.085 Å | (11) |
| 3.649 Å | (100) |
| 2.861 Å | (51) |
| 2.660 Å | (19) |
| 2.364 Å | (25) |
| 2.267 Å | (14) |
| 1.822 Å | (12) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 45a : [Sulfates, arsenates, selenates, antimonates] | |
| 45b : [Other oxidized fumarolic minerals] | |
| Stage 10b: Anthropogenic minerals | <10 Ka |
| 54 : Coal and other mine fire minerals (see also #51 and #56) |
Type Occurrence of Steklite
General Appearance of Type Material:
Hexagonal plates and more frequently multi!angular irregular lamellae. The both are commonly 5–10 µm and occasionally up to 30 µm in thickness; 0.2 mm and rarely up to 1 mm across
Place of Conservation of Type Material:
Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, registration number 4109/1
Geological Setting of Type Material:
Burnt coal dump
Fumarole
Fumarole
Associated Minerals at Type Locality:
Reference:
Murashko, M.; Pekov, I.; Krivovichev, S.; Chernyatyeva, A.; Yapaskurt, V.; Zadov, A.; Zelensky, M. (2013): Steklite, KAl(SO4)2: A finding at the Tolbachik Volcano, Kamchatka, Russia, validating its status as a mineral species and crystal structure. Geology of Ore Deposits, 55, 594-600.
Synonyms of Steklite
Common Associates
Associated Minerals Based on Photo Data:
| 1 photo of Steklite associated with Euchlorine | KNaCu3(SO4)3O |
Related Minerals - Strunz-mindat Grouping
| 7.AC. | Aluminopyracmonite | (NH4)3Al(SO4)3 |
| 7.AC. | Amgaite | Tl+32Te6+O6 |
| 7.AC.05 | Vanthoffite | Na6Mg(SO4)4 |
| 7.AC.08 | Pyracmonite | (NH4)3Fe(SO4)3 |
| 7.AC.10 | Efremovite | (NH4)2Mg2(SO4)3 |
| 7.AC.10 | Langbeinite | K2Mg2(SO4)3 |
| 7.AC.10 | Manganolangbeinite | K2Mn2(SO4)3 |
| 7.AC.10 | Ferroefremovite | (NH4)2Fe2+2(SO4)3 |
| 7.AC.15 | Yavapaiite | KFe(SO4)2 |
| 7.AC.15 | Eldfellite | NaFe3+(SO4)2 |
| 7.AC.20 | Godovikovite | (NH4)Al(SO4)2 |
| 7.AC.20 | Sabieite | (NH4)Fe3+(SO4)2 |
| 7.AC.35 | Aphthitalite | (K,Na)3Na(SO4)2 |
| 7.AC.35 | Möhnite | (NH4)K2Na(SO4)2 |
| 7.AC.35 | Belomarinaite | KNa(SO4) |
| 7.AC.35 | Natroaphthitalite | KNa3(SO4)2 |
| 7.AC.40 | Itelmenite | Na4Mg3Cu3(SO4)8 |
| 7.AC.45 | Saranchinaite | Na2Cu(SO4)2 |
| 7.AC.50 | Majzlanite | K2Na(ZnNa)Ca(SO4)4 |
| 7.AC.60 | Philoxenite | (K,Na,Pb)4(Na,Ca)2(Mg,Cu)3(Fe3+0.5Al0.5)(SO4)8 |
| 7.AC.75 | Petrovite | Na12Cu2(SO4)8 |
Fluorescence of Steklite
none
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 Steklite
mindat.org URL:
https://www.mindat.org/min-40128.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Steklite
Reference List:
Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2011) New minerals and nomenclature modifications approved in 2011, CNMNC Newsletter No. 10. Mineralogical Magazine, 75 (5) 2549-2561 doi:10.1180/minmag.2011.075.5.2549
Murashko, M. N., Pekov, I. V., Krivovichev, S. V., Chernyatyeva, A. P., Yapaskurt, V. O., Zadov, A. E., Zelensky, M. E. (2013) Steklite, KAl(SO4)2: A finding at the Tolbachik Volcano, Kamchatka, Russia, validating its status as a mineral species and crystal structure. Geology of Ore Deposits, 55 (7) 594-600 doi:10.1134/s1075701513070088
Localities for Steklite
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.
Quick NavTopAbout StekliteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsCommon AssociatesStrunz-MindatFluorescence Other InformationInternet Links References Localities Locality List
Yadovitaya fumarole, Second scoria cone, Northern Breakthrough, Great Fissure eruption, Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia