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Cryptochalcite

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About CryptochalciteHide

Formula:
K2Cu5O(SO4)5
Colour:
Light green to green
Lustre:
Vitreous
Specific Gravity:
3.41 (Calculated)
Crystal System:
Triclinic
Name:
Named from Greek κρυπτóς, concealed, and χαλκóς, copper.
New structure type. The K (or K2-) analogue of cesiodymite.

Visually indistinguishable from cesiodymite.


Classification of CryptochalciteHide

Approved
Approval Year:
2015
First Published:
2018

Physical Properties of CryptochalciteHide

Vitreous
Transparency:
Transparent
Colour:
Light green to green
Tenacity:
Brittle
Density:
3.41 g/cm3 (Calculated)

Optical Data of CryptochalciteHide

Type:
Biaxial (-)
RI values:
nα = 1.610(3) nβ = 1.632(4) nγ = 1.643(4)
2V:
Measured: 65° (5)
Max Birefringence:
δ = 0.033
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of CryptochalciteHide

Formula:
K2Cu5O(SO4)5

Crystallography of CryptochalciteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 10.0045(3) Å, b = 12.6663(4) Å, c = 14.4397(5) Å
α = 102.194(3)°, β = 102.194(3)°, γ = 90.008(3)°
Ratio:
a:b:c = 0.79 : 1 : 1.14
Unit Cell V:
1751.7 ų
Z:
4
Morphology:
Coarse tabular or prismatic crystals; grains up to 0.3 mm.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
g = 90.008(3)º13.9
6.95(100)
6.22(45)
3.93(65)
3.76(30)
3.39(30)
3.19(35)
2.500(40)
Comments:
From Type Description.

Occurrences of CryptochalciteHide

Paragenetic Mode(s):
•  Fumarolic

Type Occurrence of CryptochalciteHide

General Appearance of Type Material:
Coarse tabular or prismatic crystals or grains up to 0.3 mm
Place of Conservation of Type Material:
Type material is deposited in the collections of the Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow, Russia, registration number 4675/1
Empirical Formula of Type Material:
(K1.83Na0.09Rb0.09Cs0.062.07(Cu3.86Zn1.02Mg0.195.07S4.97O21
Geological Setting of Type Material:
Fumarole
Associated Minerals at Type Locality:
Reference:
Pekov, I.V., Zubkova, N.V., Agakhanov, A.A., Pushcharovsky, D.Yu., Yapaskurt, V.O., Belakovskiy, D.I., Vigasina, M.F., Sidorov, E.G., Britvin, S.N. (2018): Cryptochalcite, K2Cu5O(SO4)5, and cesiodymite, CsKCu5O(SO4)5, two new isotypic minerals and the K-Cs isomorphism in this solid-solution series. European Journal of Mineralogy, 30: 593-607

Synonyms of CryptochalciteHide

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 CryptochalciteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Pekov, I.V., Zubkova, N.V., Agakhanov, A.A., Yapaskurt, V.O., Belakovskiy, D.I., Vigasina, M.F., Sidorov, E.G. and Pushcharovsky, D.Y. (2015) Cryptochalcite, IMA 2014-106. CNMNC Newsletter No. 25, June 2015, page 530; Mineralogical Magazine, 79, 529-535.
Pekov, I.V., Zubkova, N.V., Agakhanov, A.A., Pushcharovsky, D.Yu., Yapaskurt, V.O., Belakovskiy, D.I., Vigasina, M.F., Sidorov, E.G., Britvin, S.N. (2018): Cryptochalcite, K2Cu5O(SO4)5, and cesiodymite, CsKCu5O(SO4)5, two new isotypic minerals and the K-Cs isomorphism in this solid-solution series. European Journal of Mineralogy, 30: 593-607.

Internet Links for CryptochalciteHide

Localities for CryptochalciteHide

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)
 
  • Kamchatka Krai
    • Tolbachik volcano
      • Great Fissure eruption (Main Fracture)
        • Northern Breakthrough (North Breach)
          • Second scoria cone
Pekov, I.V., Zubkova, N.V., Agakhanov, A.A., Yapaskurt, V.O., Belakovskiy, D.I., Vigasina, M.F., Sidorov, E.G. and Pushcharovsky, D.Y. (2015) Cryptochalcite, IMA 2014-106. CNMNC Newsletter No. 25, June 2015, page 530; Mineralogical Magazine, 79, 529-535. ;Pekov, I.V., Zubkova, N.V., Agakhanov, A.A., Pushcharovsky, D.Yu., Yapaskurt, V.O., Belakovskiy, D.I., Vigasina, M.F., Sidorov, E.G., Britvin, S.N. (2018): Cryptochalcite, K2Cu5O(SO4)5, and cesiodymite, CsKCu5O(SO4)5, two new isotypic minerals and the K-Cs isomorphism in this solid-solution series. European Journal of Mineralogy, 30, 593-607
Mineral and/or Locality  
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