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Cryobostryxite

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About CryobostryxiteHide

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.


Classification of CryobostryxiteHide

Approved
Approval Year:
2014

Physical Properties of CryobostryxiteHide

Vitreous
Transparency:
Transparent
Colour:
colorless
Hardness:
Density:
2.30(2) g/cm3 (Measured)    2.300 g/cm3 (Calculated)

Optical Data of CryobostryxiteHide

Type:
Biaxial (+)
RI values:
nα = 1.522(2) nβ = 1.530(2) nγ = 1.576(3)
2V:
Measured: 30° (15)
Max Birefringence:
δ = 0.054
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low

Chemical Properties of CryobostryxiteHide

Formula:
KZnCl3·2H2O
IMA Formula:
KZnCl3 · 2H2O
Common Impurities:
Tl

Crystallography of CryobostryxiteHide

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)°
Ratio:
a:b:c = 0.619 : 1 : 1.192
Unit Cell V:
732.79 ų
Z:
4

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
7.62(30)
5.986(43)
5.766(35)
3.907(33)
3.466(20)
3.062(100)
2.996(24)
2.853(27)
Comments:
From Type Description.

Type Occurrence of CryobostryxiteHide

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
Associated Minerals at Type Locality:

Synonyms of CryobostryxiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Halite1 photo of Cryobostryxite associated with Halite on mindat.org.

Other InformationHide

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 CryobostryxiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 CryobostryxiteHide

Localities for CryobostryxiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Russia (TL)
 
  • Far-Eastern Region
    • Kamchatka Oblast'
      • Tolbachik volcano
        • Great Fissure eruption (Main Fracture)
          • Northern Breakthrough (North Breach)
            • First scoria cone (First cinder cone)
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.
Mineral and/or Locality  
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