Chiolite
A valid IMA mineral species - grandfathered
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About Chiolite
Formula:
Na5Al3F14
Colour:
Nearly colourless, snow-white
Lustre:
Vitreous, Pearly
Hardness:
2½
Specific Gravity:
2.998
Crystal System:
Tetragonal
Name:
From the Greek χιώυ, snow, and λίθος, stone, in allusion to its appearance and similarity to cryolite (ice-stone).
This page provides mineralogical data about Chiolite.
Unique Identifiers
Mindat ID:
1006
Long-form identifier:
mindat:1:1:1006:7
GUID
(UUID V4):
(UUID V4):
5653b624-48a7-4c31-b021-faefc2476473
IMA Classification of Chiolite
Approved, 'Grandfathered' (first described prior to 1959)
Classification of Chiolite
3.CE.05
3 : HALIDES
C : Complex halides
E : Phyllo-aluminofluorides
3 : HALIDES
C : Complex halides
E : Phyllo-aluminofluorides
11.6.11.1
11 : HALIDE COMPLEXES
6 : Aluminofluorides - Isolated Octahedra
11 : HALIDE COMPLEXES
6 : Aluminofluorides - Isolated Octahedra
8.6.6
8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
6 : Halides of Al
8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
6 : Halides of Al
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 |
---|---|---|
Cio | 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 Chiolite
Vitreous, Pearly
Transparency:
Transparent, Translucent
Colour:
Nearly colourless, snow-white
Hardness:
2½ on Mohs scale
Hardness:
VHN25=122 - 206 kg/mm2 - Vickers
Comment:
Previously given as Mohs 3.5-4. Modern measurement and discussion by Pauly (1985).
Cleavage:
Perfect
On {001}; on {011} distinct.
On {001}; on {011} distinct.
Density:
2.998 g/cm3 (Measured) 2.989 g/cm3 (Calculated)
Optical Data of Chiolite
Type:
Uniaxial (-)
RI values:
nω = 1.349 nε = 1.342
Max Birefringence:
δ = 0.007
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:
Moderate
Chemistry of Chiolite
Mindat Formula:
Na5Al3F14
Elements listed:
Crystallography of Chiolite
Crystal System:
Tetragonal
Class (H-M):
4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group:
P4/mnc
Cell Parameters:
a = 7.01 Å, c = 10.4 Å
Ratio:
a:c = 1 : 1.484
Unit Cell V:
511.06 ų (Calculated from Unit Cell)
Morphology:
Crystals dipyramidal {011}. Distinct crystals small and rare. Massive, granular.
Twinning:
On {011}, distorted into prismatic shapes at times.
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) |
---|---|---|---|---|---|---|---|
0013413 | Chiolite | Jacoboni C, Leble A, Rousseau J J (1981) Determination precise de la structure de la chiolite Na5Al3F14 et etude par R.P.E. de Na5Al3F14:Cr3+ Journal of Solid State Chemistry 36 297-304 | 1981 | synthetic | 0 | 293 | |
0015747 | Chiolite | Brosset C (1938) Die kristallstruktur des chioliths Zeitschrift fur Anorganische und Allgemeine Chemie 238 201-208 | 1938 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Image Loading
Radiation - Copper Kα
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
2.91 Å | (100) |
5.18 Å | (80) |
2.32 Å | (70) |
1.99 Å | (70) |
1.79 Å | (70) |
1.75 Å | (70) |
1.55 Å | (70) |
Comments:
Synthetic; composite pattern, ICDD 2-749.
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Near-surface Processes | |
23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47) | |
Stage 4b: Highly evolved igneous rocks | >3.0 |
34 : Complex granite pegmatites |
Type Occurrence of Chiolite
Place of Conservation of Type Material:
Vernadsky State Geological Museum, Moscow, Russia, numbers 18270, 18271.
Geowissenschaftliches Zentrum, Georg August Universität-Göttingen, Russia, numbers GZG.MIN.3.2.7.1, GZG.MIN.3.2.7.5, GZG.MIN.3.27.6.
Geowissenschaftliches Zentrum, Georg August Universität-Göttingen, Russia, numbers GZG.MIN.3.2.7.1, GZG.MIN.3.2.7.5, GZG.MIN.3.27.6.
Geological Setting of Type Material:
Cryolite-bearing pegmatite.
Associated Minerals at Type Locality:
Synonyms of Chiolite
Other Language Names for Chiolite
Common Associates
Associated Minerals Based on Photo Data:
8 photos of Chiolite associated with Cryolite | Na2NaAlF6 |
6 photos of Chiolite associated with Topaz | Al2(SiO4)(F,OH)2 |
5 photos of Chiolite associated with Pyrite | FeS2 |
3 photos of Chiolite associated with Hydrokenoralstonite | Na0.5(Al,Mg)2(F,OH)6 · H2O |
2 photos of Chiolite associated with Chlorite Group | |
2 photos of Chiolite associated with Jarlite | Na(Sr,Na)7MgAl6F32(OH,H2O)2 |
2 photos of Chiolite associated with Sericite | KAl2(AlSi3O10)(OH)2 |
2 photos of Chiolite associated with Fluorite | CaF2 |
2 photos of Chiolite associated with Chalcopyrite | CuFeS2 |
1 photo of Chiolite associated with Elpasolite | K2NaAlF6 |
Related Minerals - Strunz-mindat Grouping
3.CE.05 | Khodnevite | Na2AlF5 (?) |
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 Chiolite
mindat.org URL:
https://www.mindat.org/min-1006.html
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Please feel free to link to this page.
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References for Chiolite
Reference List:
Localities for Chiolite
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.
Brazil | |
| 7. symposium on volcanism and ... +2 other references |
Greenland | |
| Nordenshiöld (1886) +2 other references |
Russia (TL) | |
| Bailey +2 other references |
| Victor V. Sharygin analytycal data (2012) +2 other references |
Ukraine | |
| Bailey |
USA | |
| Kearns (1995) +1 other reference |
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Pit No. 69, Ilmen Mountains, Chelyabinsk Oblast, Russia