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Cryptochalcite

A valid IMA mineral species
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03825310014947049699231.jpg
Cryptochalcite

Arsenatnaya fumarole, Second scoria cone, Northern Breakthrough, Great Fissure eruption, Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia
00625500016041658931962.jpg
Cryptochalcite

Arsenatnaya fumarole, Second scoria cone, Northern Breakthrough, Great Fissure eruption, Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia
03825310014947049699231.jpg
Cryptochalcite

Arsenatnaya fumarole, Second scoria cone, Northern Breakthrough, Great Fissure eruption, Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia
00625500016041658931962.jpg
Cryptochalcite

Arsenatnaya fumarole, Second scoria cone, Northern Breakthrough, Great Fissure eruption, Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia
03825310014947049699231.jpg
Cryptochalcite

Arsenatnaya fumarole, Second scoria cone, Northern Breakthrough, Great Fissure eruption, Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia
06242800016041658934820.jpg
Cryptochalcite

Arsenatnaya fumarole, Second scoria cone, Northern Breakthrough, Great Fissure eruption, Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia
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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. The name was selected because the species was found in association with other visually similar green copper oxysulfates, hence the name cryptochalcite means “concealed among other copper minerals.”
New structure type. The K (or K2-) analogue of cesiodymite.

Visually indistinguishable from cesiodymite.


Unique IdentifiersHide

Mindat ID:
46612
Long-form identifier:
mindat:1:1:46612:3
GUID
(UUID V4):
8e59864c-8bc7-4a82-8ae8-f65302240d5e

IMA Classification of CryptochalciteHide

Classification of CryptochalciteHide

Strunz-mindat (2023):
8.BF.35

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
F : With medium-sized and large cations, (OH, etc.):RO4< 0.5:1

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
CpchIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of CryptochalciteHide

Lustre:
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

Chemistry of CryptochalciteHide

Mindat Formula:
K2Cu5O(SO4)5
Elements listed:
Cu, K, O, S - search for minerals with similar chemistry

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 Å(3)º13.9
6.95 Å(100)
6.22 Å(45)
3.93 Å(65)
3.76 Å(30)
3.39 Å(30)
3.19 Å(35)
2.500 Å(40)
Comments:
From Type Description.

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 7: Great Oxidation Event<2.4
45a : [Sulfates, arsenates, selenates, antimonates]

Type Occurrence of CryptochalciteHide

Type Locality:
ⓘ Arsenatnaya fumarole, Second scoria cone, Northern Breakthrough (North Breach), Great Fissure eruption (Main Fracture), Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia
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:
(K1.83Na0.09Rb0.09Cs0.06)Σ2.07(Cu3.86Zn1.02Mg0.19)Σ5.07S4.97O21
Geological Setting of Type Material:
Fumarole
Associated Minerals at Type Locality:
WulffiteStekliteLangbeiniteHematiteFedotovite
EuchlorineChalcocyaniteCesiodymiteAphthitaliteAnglesite
Alumoklyuchevskite
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

Related Minerals - Strunz-mindat GroupingHide

8.BF.Sigismundite(Ba◻)(Fe2+◻)Ca(Na2◻)Fe2+13Al(PO4)11(PO3OH)(OH)2Mon. m : Bb
8.BF.Manganoarrojadite-(KNa)(KNa)(NaNa)Mn2+(Na2◻)Fe2+13Al(PO4)11(PO3OH)(OH)2Mon. m : Bb
8.BF.05Arrojadite-(KFe)(KNa)(Fe2+◻)Ca(Na2◻)Fe2+13Al(PO4)11(PO3OH)(OH)2Mon. m : Bb
8.BF.05Dickinsonite-(KMnNa)(KNa)(Mn2+◻)Ca(Na2Na)Mn2+13Al(PO4)11(PO4)(OH)2Mon. 2/m : B2/b
8.BF.05Arrojadite-(SrFe)(Sr◻)(Fe2+◻)Ca(Na2◻)Fe2+13Al(PO4)11(PO3OH)(OH)2Mon. m : Bb
8.BF.05Arrojadite-(KNa)(KNa)(NaNa)Ca(Na2◻)Fe2+13Al(PO4)11(PO3OH)(OH)2Mon. m : Bb
8.BF.05Arrojadite-(PbFe)(Pb◻)(Fe2+◻)Ca(Na2◻)Fe2+13Al(PO4)11(PO3OH)(OH)2Mon. m : Bb
8.BF.05Fluorarrojadite-(BaFe)(Ba◻)(Fe2+◻)Ca(Na2◻)Fe2+13Al(PO4)11(PO3OH)F2Mon. m : Bb
8.BF.05Arrojadite-(KFeNa)(KNa)(Fe2+◻)Ca(Na2Na)Fe2+13Al(PO4)11(PO4)(OH)2
8.BF.05Arrojadite-(NaFe)(NaNa)(Fe2+◻)Ca(Na2◻)Fe2+13Al(PO4)11(PO3OH)(OH)2
8.BF.05Arrojadite-(BaNa)(Ba◻)(NaNa)Ca(Na2◻)Fe2+13Al(PO4)11(PO3OH)(OH)2Mon. 2/m : B2/b
8.BF.05Ferri-arrojadite-(BaNa)(Ba◻)(NaNa)Ca(Na2◻)Fe2+13Fe3+(PO4)11(PO3OH)(OH)2
8.BF.05Fluorarrojadite-(KNa)(KNa)(NaNa)Ca(Na2◻)Fe2+13Al(PO4)11(PO3OH)F2
8.BF.05Fluorarrojadite-(NaFe)(NaNa)(Fe2+◻)Ca(Na2◻)Fe2+13Al(PO4)11(PO3OH)F2
8.BF.05Fluorcarmoite-(BaNa)(Ba◻)(NaNa)Ca(Na2◻)Mg13Al(PO4)11(PO3OH)F2Mon. m : Bb
8.BF.05Unnamed (Ba-dominant member of dickinsonite group)
8.BF.05Unnamed (Pb-dominant member of dickinsonite group)
8.BF.05Fluorarrojadite-(BaNa)(Ba◻)(NaNa)Ca(Na2◻)Fe2+13Al(PO4)11(PO3OH)F2Mon. m : Bb
8.BF.10Samuelsonite(Ca,Ba)Ca8Fe2+2Mn2+2Al2(PO4)10(OH)2Mon. 2/m : B2/m
8.BF.15GriphiteNa4Li2Ca6(Mn2+,Fe2+,Mg)19Al8(PO4)24(F,OH)8Iso. m3 (2/m 3) : Pa3
8.BF.20NabiasiteBaMn9(VO4)6(OH)2Iso. m3 (2/m 3) : Pa3
8.BF.25StarovaiteKCu5O(VO4)3 Tric. 1 : P1
8.BF.30Achyrophanite(K,Na)3(Fe3+,Ti,Al,Mg)5O2(AsO4)5Orth. 2 2 2 : P2 2 21
8.BF.35CesiodymiteCsKCu5O(SO4)5Tric. 1 : P1

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.

Internet Links for CryptochalciteHide

References 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 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.
Italy
 
  • Campania
    • Naples
      • Somma-Vesuvius Complex
Balassone, G.
Petti, C.
Mondillo, N.
Panikorovskii, T.L.
de Gennaro, R.
Cappelletti, P.
Altomare, A.
Corriero, N.
Cangiano, M.
D’Orazio, L. (2019) Copper Minerals at Vesuvius Volcano (Southern Italy): A Mineralogical Review. Minerals 9, 730.
Russia (TL)
 
  • Kamchatka Krai
    • Milkovsky District
      • Tolbachik Volcanic field
        • Great Fissure eruption (Main Fracture)
          • Northern Breakthrough (North Breach)
            • Second scoria cone
Mineralogical Magazine, 79, 529-535.
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2015) New minerals and nomenclature modifications approved in 2015, CNMNC Newsletter No 25. Mineralogical Magazine, 79 (3) 529-535 doi:10.1180/minmag.2015.079.3.02
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
Quick NavTopAbout CryptochalciteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsStrunz-MindatOther InformationInternet Links References Localities Locality List
 
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