Cryobostryxite
A valid IMA mineral species
This page is currently not sponsored. Click here to sponsor this page.
About Cryobostryxite
Formula:
KZnCl3 · 2H2O
Colour:
Colorless
Lustre:
Vitreous
Hardness:
2
Specific Gravity:
2.30
Crystal System:
Monoclinic
Name:
The mineral name is based on two Greek words, κρύος, cold or ice, and βóστρυξ, curl, reflecting the typical appearance: visually, anthodites of the mineral are very similar to ice curls.
Chemically related to flinteite and mellizinkalite (both anhydrous).
In the structure there are isolated Zn-centered ZnCl3(H2O) tetrahedra connected with KCl7(H2O) polyhedra to constitute a framework. Water in the above polyhedra contains O(1) atoms only. H2O(2) molecules reside within holes of the above pseudo-framework.
In the structure there are isolated Zn-centered ZnCl3(H2O) tetrahedra connected with KCl7(H2O) polyhedra to constitute a framework. Water in the above polyhedra contains O(1) atoms only. H2O(2) molecules reside within holes of the above pseudo-framework.
Unique Identifiers
Mindat ID:
46440
Long-form identifier:
mindat:1:1:46440:8
GUID
(UUID V4):
(UUID V4):
17e0b95f-7d19-415e-bc5b-9bd13a93452d
Classification of Cryobostryxite
Approved
Approval year:
2014
First published:
2015
3.BA.20
3 : HALIDES
B : Simple halides, with H2O
A : M:X = 1:1 and 2:3
3 : HALIDES
B : Simple halides, with H2O
A : M:X = 1:1 and 2:3
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 |
|---|---|---|
| Cbx | 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 Cryobostryxite
Vitreous
Transparency:
Transparent
Colour:
Colorless
Streak:
White
Hardness:
2 on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Parting:
None obeserved.
Fracture:
Irregular/Uneven
Density:
2.30(2) g/cm3 (Measured) 2.300 g/cm3 (Calculated)
Optical Data of Cryobostryxite
Type:
Biaxial (+)
RI values:
nα = 1.522(2) nβ = 1.530(2) nγ = 1.576(3)
2V:
Measured: 30° (15), Calculated: 46°
Max Birefringence:
δ = 0.054
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:
None.
Optical Extinction:
Plane of optical axes is (010); Z ∧ c = 26°.
Pleochroism:
Non-pleochroic
Chemical Properties of Cryobostryxite
Formula:
KZnCl3 · 2H2O
Common Impurities:
Tl
Crystallography of Cryobostryxite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/c
Cell Parameters:
a = 6.2795(3) Å, b = 10.1397(3) Å, c = 12.0829(7) Å
β = 107.732(5)°, γ = 107.732(5)°
β = 107.732(5)°, γ = 107.732(5)°
Ratio:
a:b:c = 0.619 : 1 : 1.192
Unit Cell V:
732.79 ų
Z:
4
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.62 Å | (30) |
| 5.986 Å | (43) |
| 5.766 Å | (35) |
| 3.907 Å | (33) |
| 3.466 Å | (20) |
| 3.062 Å | (100) |
| 2.996 Å | (24) |
| 2.853 Å | (27) |
Comments:
Northern fumarole field, First scoria cone, Tolbachik Volcanic field, Russia. Data from the type description.
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 Cryobostryxite
General Appearance of Type Material:
Anthodites (up to 0.5 × 2 mm), their aggregates (up to 4 × 5 mm), granular crusts (up to 2 × 2 mm) and, rarely, coarse prismatic to acicular crystals (up to 0.2 × 1 mm).
Place of Conservation of Type Material:
Type material is deposited in the collections of the Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia, registration number 4576/1.
Geological Setting of Type Material:
Secondary mineral formed in the upper, moderately hot (30–80 °C) zone of active fumaroles, probably as a product of the interactions between high-temperature volcanic sublimates and meteoric water. Formed on the surface of basalt scoria.
Associated Minerals at Type Locality:
Synonyms of Cryobostryxite
Common Associates
Related Minerals - Strunz-mindat Grouping
| 3.BA.05 | Hydrohalite | NaCl · 2H2O | Mon. 2/m : P21/b |
| 3.BA.10 | Carnallite | KMgCl3 · 6H2O | Orth. mmm (2/m 2/m 2/m) : Pnna |
| 3.BA.15 | Novograblenovite | (NH4)MgCl3 · 6H2O | Mon. 2/m : B2/b |
Other Information
IR Spectrum:
O–H stretching (3200–3600 cm-1) and H–O–H bending (1607 cm-1), vibrations of H2O molecules as a whole (508 cm-1). A band at 3590 cm-1 and a doublet 3533 + 3520 cm-1 conform with weak hydrogen bonds formed by the atoms H3 and H4. Bands at 3372 and 3210 cm-1 conform with strong hydrogen bonds formed by the atoms H1 and H2. Weak bands in the range 600–1200 cm-1 correspond to overtones and combination modes. Absorptions corresponding to B–O, C–O, N–O and N–H bonds are absent.
Notes:
Readily dissolves in H2O at room temperature.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
References for Cryobostryxite
Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Süsse, P., Brehler, B. (1964). Die Kristallstruktur des KZnCl3·2H2O. Beiträge zur Mineralogie und Petrographie, 10, 132–140. (synthetic)
Pekov, I.V., Zubkova, N.V., Britvin, S.N., Yapaskurt, V.O., Chukanov, N.V., Lykova, I.S., Sidorov, E.G. and Pushcharovsky, D.Y. (2014) Cryobostryxite, IMA 2014-058. CNMNC Newsletter No. 22, October 2014, page 1247. Mineralogical Magazine, 78, 1241-1248.
Pekov, I.V., Zubkova, N.V., Britvin, S.N., Yapaskurt, V.O., Chukanov, N.V., Lykova, I.S., Sidorov, E.G., Pushcharovsky, D.Y. (2015): New zinc and potassium chlorides from fumaroles of the Tolbachik volcano, Kamchatka, Russia: mineral data and crystal chemistry. III. Cryobostryxite, KZnCl3·2H2O. European Journal of Mineralogy: 27(6): 805-812.
Internet Links for Cryobostryxite
mindat.org URL:
https://www.mindat.org/min-46440.html
Please feel free to link to this page.
Please feel free to link to this page.
External Links:
Mineral Dealers:
Localities for Cryobostryxite
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.
Russia (TL) | |
| Pekov, I.V., Zubkova, N.V., Britvin, S.N., Yapaskurt, V.O., Chukanov, N.V., Lykova, I.S., Sidorov, E.G. and Pushcharovsky, D.Y. (2014) Cryobostryxite, IMA 2014-058. CNMNC Newsletter No. 22, October 2014, page 1247; Mineralogical Magazine, 78, 1241-1248. |
Quick NavTopAbout CryobostryxiteUnique IdentifiersClassification Mineral SymbolsPhysical Properties Optical Data Chemical Properties Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsCommon AssociatesStrunz-MindatOther InformationReferences Internet Links Localities Locality List
Northern fumarole field, First scoria cone, Northern Breakthrough, Great Fissure eruption, Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia