Donate now to keep alive!Help|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on Mindat
What is a mineral?The most common minerals on earthMineral PhotographyThe Elements and their MineralsGeological TimeMineral Evolution
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
StatisticsThe ElementsMember ListBooks & MagazinesMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery


This page is currently not sponsored. Click here to sponsor this page.
Na2Cu(SO4)2 · 2H2O
Blue, greenish-blue; light blue to colourless in transmitted light
2½ - 3
Specific Gravity:
Crystal System:
Member of:
After B. Kröhnke, who first analyzed the mineral.
The anhydrous phase is saranchinaite which may form after heating kröhnkite to 200°C.

Hide all sections | Show all sections

Classification of KröhnkiteHide

Approved, 'Grandfathered' (first described prior to 1959)

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
C : Sulfates (selenates, etc.) without additional anions, with H2O
C : With medium-sized and large cations

3 : A2B(XO4)2·xH2O

25 : Sulphates
2 : Sulphates of Cu and Ag

Physical Properties of KröhnkiteHide

Blue, greenish-blue; light blue to colourless in transmitted light
2½ - 3 on Mohs scale
On {010} perfect; on {1¯01} very imperfect.
2.9 g/cm3 (Measured)    2.95 g/cm3 (Calculated)

Optical Data of KröhnkiteHide

Biaxial (-)
RI values:
nα = 1.544 nβ = 1.578 nγ = 1.601
Measured: 78° , Calculated: 76°
Max Birefringence:
δ = 0.057
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:

Chemical Properties of KröhnkiteHide

Na2Cu(SO4)2 · 2H2O

Crystallography of KröhnkiteHide

Crystal System:
Class (H-M):
2/m - Prismatic
Space Group:
Cell Parameters:
a = 5.78 Å, b = 12.58 Å, c = 5.48 Å
β = 108.3°
a:b:c = 0.459 : 1 : 0.436
Unit Cell V:
378.31 ų (Calculated from Unit Cell)
Crystals short prismatic [001]; also octahedral with large {110} and {011} and rather elongated [100]. Prismatic or fibrous aggregates and crusts; massive, granular.
On {101}, common; twins heart-shaped at times.

Type Occurrence of KröhnkiteHide

Synonyms of KröhnkiteHide

Other Language Names for KröhnkiteHide

Simplified Chinese:柱钠铜矾

Relationship of Kröhnkite to other SpeciesHide

Member of:
Other Members of this group:
BrandtiteCa2(Mn2+,Mg)(AsO4)2 · 2H2OMon. 2/m : P21/b
RoseliteCa2(Co2+,Mg)(AsO4)2 · 2H2OMon. 2/m : P21/b
RruffiteCa2Cu(AsO4)2 · 2H2OMon. 2/m : P21/b
Unnamed (Fe2+-analogue of Brandtite)Ca2Fe2+(AsO4)2 · 2H2O
WendwilsoniteCa2Mg(AsO4)2 · 2H2OMon. 2/m : P21/b
ZincroseliteCa2Zn(AsO4)2 · 2H2OMon.

Common AssociatesHide

Associated Minerals Based on Photo Data:
Natrochalcite7 photos of Kröhnkite associated with Natrochalcite on
Atacamite4 photos of Kröhnkite associated with Atacamite on
Caracolite3 photos of Kröhnkite associated with Caracolite on
Antlerite2 photos of Kröhnkite associated with Antlerite on
Brochantite2 photos of Kröhnkite associated with Brochantite on
Changoite2 photos of Kröhnkite associated with Changoite on
Chalcedony1 photo of Kröhnkite associated with Chalcedony on
Malachite1 photo of Kröhnkite associated with Malachite on

Related Minerals - Nickel-Strunz GroupingHide

7.CC.CobaltoblöditeNa2Co(SO4)2•4H2OMon. 2/m : P21/b
7.CC.AndychristyitePbCu2+Te6+O5(H2O)Tric. 1 : P1
7.CC.05KrausiteKFe(SO4)2 · H2OMon. 2/m : P21/m
7.CC.10TamarugiteNaAl(SO4)2 · 6H2OMon. 2/m
7.CC.15KaliniteKAl(SO4)2 · 11H2OMon. 2/m : B2/b
7.CC.15MendoziteNaAl(SO4)2 · 11H2OMon. 2/m
7.CC.20Lonecreekite(NH4)Fe3+(SO4)2 · 12H2OIso.
7.CC.20Alum-(K)KAl(SO4)2 · 12H2OIso. m3 (2/m 3)
7.CC.20Alum-(Na)NaAl(SO4)2 · 12H2O
7.CC.20Tschermigite(NH4)Al(SO4)2 · 12H2OIso. m3 (2/m 3) : Pa3
7.CC.20LanmuchangiteTl+Al(SO4)2 · 12H2OIso. m3 (2/m 3) : Pa3
7.CC.25VoltaiteK2Fe2+5Fe3+3Al(SO4)12 · 18H2OIso. m3m (4/m 3 2/m) : Fd3c
7.CC.25ZincovoltaiteK2Zn5Fe3+3Al(SO4)12 · 18H2OIso. m3m (4/m 3 2/m) : Fd3c
7.CC.25PertlikiteK2(Fe2+,Mg)2Mg4Fe3+2Al(SO4)12 · 18H2OTet. 4/mmm (4/m 2/m 2/m) : I41/acd
7.CC.25Ammoniomagnesiovoltaite(NH4)2Mg2+5Fe3+3Al(SO4)12 · 18H2OIso. m3m (4/m 3 2/m) : Fd3c
7.CC.35FerrinatriteNa3Fe(SO4)3 · 3H2OTrig. 3 : P3
7.CC.40GoldichiteKFe(SO4)2 · 4H2OMon. 2/m : P21/b
7.CC.45LöweiteNa12Mg7(SO4)13 · 15H2OTrig.
7.CC.50BlöditeNa2Mg(SO4)2 · 4H2OMon. 2/m
7.CC.50NickelblöditeNa2(Ni,Mg)(SO4)2 · 4H2O
7.CC.50ChangoiteNa2Zn(SO4)2 · 4H2OMon. 2/m : P21/b
7.CC.55LeoniteK2Mg(SO4)2 · 4H2OMon. 2/m
7.CC.55MereiteriteK2Fe(SO4)2 · 4H2OMon.
7.CC.60Boussingaultite(NH4)2Mg(SO4)2 · 6H2OMon. 2/m : P21/b
7.CC.60CyanochroiteK2Cu(SO4)2 · 6H2OMon. 2/m
7.CC.60Mohrite(NH4)2Fe(SO4)2 · 6H2OMon. 2/m : P21/b
7.CC.60Nickelboussingaultite(NH4)2Ni(SO4)2 · 6H2O
7.CC.60PicromeriteK2Mg(SO4)2 · 6H2OMon. 2/m
7.CC.65PolyhaliteK2Ca2Mg(SO4)4 · 2H2OTric. 1
7.CC.70LeightoniteK2Ca2Cu(SO4)4 · 2H2OTric.
7.CC.75AmarilliteNaFe(SO4)2 · 6H2OMon. 2/m : B2/b
7.CC.80KonyaiteNa2Mg(SO4)2 · 5H2OMon. 2/m : P21/b
7.CC.85WattevilleiteNa2Ca(SO4)2 · 4H2O (?)Orth.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

25.2.1ChalcocyaniteCuSO4Orth. mmm (2/m 2/m 2/m)
25.2.2BonattiteCuSO4 · 3H2OMon.
25.2.3ChalcanthiteCuSO4 · 5H2OTric. 1 : P1
25.2.4BoothiteCuSO4 · 7H2OMon.
25.2.5DolerophaniteCu2(SO4)OMon. 2/m : B2/m
25.2.6AntleriteCu3(SO4)(OH)4Orth. mmm (2/m 2/m 2/m)
25.2.7BrochantiteCu4(SO4)(OH)6Mon. 2/m : P21/b
25.2.8PosnjakiteCu4(SO4)(OH)6 · H2OMon. m : Pm
25.2.9LangiteCu4(SO4)(OH)6 · 2H2OMon. m
25.2.10WroewolfeiteCu4(SO4)(OH)6 · 2H2OMon. m : Pm
25.2.12NatrochalciteNaCu2(SO4)2(OH) · 2H2OMon. 2/m : B2/m
25.2.13PiypiteK4Cu4O2(SO4)4 · (Na,Cu)ClTet.
25.2.14FedotoviteK2Cu3(SO4)3OMon. 2/m : B2/b
25.2.15CyanochroiteK2Cu(SO4)2 · 6H2OMon. 2/m
25.2.17DevillineCaCu4(SO4)2(OH)6 · 3H2OMon. 2/m : P21/b
25.2.18LeightoniteK2Ca2Cu(SO4)4 · 2H2OTric.
25.2.19ChalcoalumiteCuAl4(SO4)(OH)12 · 3H2OMon. 2 : P21
25.2.20CyanotrichiteCu4Al2(SO4)(OH)12 · 2H2OOrth.
25.2.21WoodwarditeCu1-xAlx(OH)2(SO4)x/2 · nH2OTrig. 3m (3 2/m) : R3m
25.2.22CampigliaiteMn2+Cu4(SO4)2(OH)6 · 4H2OMon.
25.2.23GuilditeCuFe3+(SO4)2(OH) · 4H2OMon.
25.2.24RansomiteCuFe2(SO4)4 · 6H2OMon. 2/m : P21/b
25.2.27Poitevinite(Cu,Fe,Zn)SO4 · H2OTric.
25.2.28ArgentojarositeAgFe3+3(SO4)2(OH)6Trig. 3m : R3m

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 KröhnkiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Domeyko, I. (1876) Elementos de Mineralogia, 2nd. Edition, Santiago (1860), with appendices 1 – 6, App. 5: 33.
Domeyko, I. (1879) Elementos de Mineralogia, 3rd. edition: 250 (as Krönnkite).
Darapsky (1889) Neues Jahrbuch für Mineralogie, Geologie und Paleontologie, Heidelberg, Stuttgart: I: 192.
Herz (1896) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 26: 16 (as Salvadorite).
Palache, C. and Warren (1908) American Journal of Science: 26: 342.
Palache, C. and Warren (1908) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 45: 534.
Palache, C. (1939) American Journal of Science: 237: 447.
Gordon (1941) Academy of Sciences Philadelphia, Not. Nat., no. 72.
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 444-446.
Leone M., Sgarlata F.(1954): Struttura della kroehnkite e contributo alla cristallochimica del rame. Periodico di Mineralogia – Roma pp. 223-234.
Acta Crystallographica (1975): B31: 1753-1755.

Internet Links for KröhnkiteHide

Localities for KröhnkiteHide

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.
  • Córdoba
    • Minas Department
Sureda (1978): Revista de la Asociacion Geologica Argentina 33(4):299-324
  • New South Wales
    • Yancowinna Co.
      • Broken Hill district
        • Broken Hill
Australian Min. 3:1 (1997)
  • Styria
    • Niedere Tauern
      • Öblarn
        • Walchen
Schebesta, K. (1992): Schlackenminerale aus der Walchen bei Öblarn. Lapis 17 (2), 19-30; 50.
  • Antofagasta Region
    • Antofagasta Province
      • Mejillones
        • Mejillones peninsula
Samples analysed by Dr. Tony Kampf, Curator of LAC Mineralogical Museum, USA
      • Sierra Gorda District
        • Caracoles
M.Dini & A.Molina collection
Malcherek, T. & Schlüter, J. (2010): Anatacamite from La Vendida mine, Sierra Gorda, Atacama desert, Chile: a triclinic polymorph of Cu2(OH)3Cl. Neues Jahrbuch für Mineralogie - Abhandlungen, 187, 307-312.; Samples analysed by Dr. Jochen Schluter (Hamburg University), Germany.
    • El Loa Province
      • Calama
        • Chuquicamata District
Jarrell, O. W. (1944): Oxidation at Chuquicamata, Chile. Economic Geology, 39, 251-86.; Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 310, 446, 564; Acta Cryst. B31 (1975), 1753; Ericksen & Mrose (1970) American Mineralogist 55:1500-1517
          • Toki Cu deposit (Toki Cluster)
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 446.
British Natural History Museum online catalogue 2007
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 446.
  • Atacama Region
    • Copiapó Province
      • Tierra Amarilla
        • Pampa Larga district
T. Djordjević and U. Kolitsch (2008): Conichalcite revisited: Structural and chemical characterisation of a sample from the Maria Catalina mine, Copiapó Province, Chile. Poster, Annual Meeting of the DMG, Berlin, Germany, September 14-17, 2008; CD with abstracts, Abs. no. 331.
  • Tarapacá Region
    • El Tamarugal Province
      • Collahuasi District
Sulphides analysed by geology dep. of company; sulphates, phosphates, analysed by Bob Jenkins (Usa) 2007
  • Xinjiang Autonomous Region
    • Hami Prefecture (Kumul Prefecture; Qumul Prefecture)
      • Hami Co. (Kumul Co.; Qumul Co.)
Yingxia Xu, Kezhang Qin, Kunshou Ding, Jinxiang Li, Yu Miao, Tonghui Fang, Xingwang Xu, Daming Li, and Xiuquan Luo (2008): Acta Petrologica Sinica 24(10), 2371-2383
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium)
      • Lavrion District Mines
        • Plaka
          • Plaka Mines
No reference listed
Branko Rieck Collection
  • Heves Co.
    • Mátra Mts
      • Recsk
No reference listed
  • Pest Co.
    • Börzsöny Mts
Koch: Minerals of Hungary, 1985
  • Tuscany
    • Livorno Province
      • Elba Island
        • Capoliveri
          • Cape Calamita Mine (Calamita Mine)
F. Quagliarella (1966) - Su alcuni solfati di Capo Calamita (Isola d'Elba) - Rend. Soc. Min. It., 22: 210.
  • Hunedoara Co.
    • Hunedoara
      • Boșorod
Onac, BP; Effenberger, HS; Collins, NC; Kearns, JB; Breban, RC (2011): Revisiting three minerals from Cioclovina Cave (Romania). International Journal of Speleology 40, 21-30.
  • England
    • Cornwall
      • St Just
        • Botallack
          • Botallack Mine
Golley, P. & Williams, R. (1995): Cornish Mineral Reference Manual. Endsleigh Publications (Truro), 104 pp.
  • California
    • Alameda Co.
      • Diablo Range
        • Oakland Hills (San Leandro Hills)
          • Oakland
            • Leona Heights
              • Leona Heights deposit
Schaller, Waldemar Theodore (1903a), Minerals from Leona Heights, Alameda County, California: University of California, Department of Geological Sciences Bulletin: 3: 207; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 298.; Anthony R. Kampf & FM Locality Index Committee (1989) California Locality Index. Mineralogical Record, 20:129-142.
[Mineralogical Record 20 129-142]
  • Utah
    • San Juan Co.
      • White Canyon District
        • Red Canyon
J. Plášil, A.R. Kampf, A.V. Kasatkin, J. Marty, R. Škoda, S. Silva, J. Čejka (2013): Meisserite, Na5(UO2)(SO4)3(SO3OH)(H2O), a new uranyl sulfate mineral from the Blue Lizard mine, San Juan County, Utah, USA. Mineralogical Magazine 77, 2975-2988
  • Virginia
    • Floyd Co.
      • Southern Section-Blue Ridge Province
        • Southern Lead
Minerals of Virginia, 1990 by R. V. Dietrich
Mineral and/or Locality is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © and the Hudson Institute of Mineralogy 1993-2018, except where stated. relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: March 21, 2018 14:55:43 Page generated: February 25, 2018 10:56:21
Go to top of page