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Leightonite

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About LeightoniteHide

Formula:
K2Ca2Cu(SO4)4 · 2H2O
Colour:
Pale blue, greenish-blue; pale blue in transmitted light.
Lustre:
Vitreous
Hardness:
3
Specific Gravity:
2.95
Crystal System:
Triclinic
Name:
Named in honor of Tomás Leighton Donoso (1896–1967), Professor of Mineralogy, University of Santiago, Chile.
Closely related to polyhalite.


Classification of LeightoniteHide

Approved, 'Grandfathered' (first described prior to 1959)
First Published:
1938
7.CC.70

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
C : Sulfates (selenates, etc.) without additional anions, with H2O
C : With medium-sized and large cations
29.4.5.2

29 : HYDRATED ACID AND NORMAL SULFATES
4 : AmBn(XO4)p·xH2O, with (m+n):p < 3:2 and > 1:1
25.2.18

25 : Sulphates
2 : Sulphates of Cu and Ag

Physical Properties of LeightoniteHide

Vitreous
Transparency:
Transparent, Translucent
Colour:
Pale blue, greenish-blue; pale blue in transmitted light.
Hardness:
Cleavage:
None Observed
Density:
2.95 g/cm3 (Measured)    

Optical Data of LeightoniteHide

Type:
Biaxial (-)
RI values:
nα = 1.578 nβ = 1.587 nγ = 1.595
2V:
Measured: 86° , Calculated: 86°
Max Birefringence:
δ = 0.017
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
very weak

Chemical Properties of LeightoniteHide

Formula:
K2Ca2Cu(SO4)4 · 2H2O

Crystallography of LeightoniteHide

Crystal System:
Triclinic
Morphology:
Pseudo-orthorhombic. Blades or laths elongated [001] and flattened {100}; rarely equant. Curved surfaces cutting away more or less of the front edges of the prism produce an hour-glass appearance. Also occurs as cross-fiber veinlets.
Twinning:
Repeated lamellar twinning on (100) and (010) of a sub-rectangular triclinic structure results in mimetic orthorhombic symmetry.

X-Ray Powder DiffractionHide

Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Type Occurrence of LeightoniteHide

General Appearance of Type Material:
cross-fiber veinlet fillings and crystals in open cavities.
Place of Conservation of Type Material:
The Natural History Museum, London, England, 1938,56.
Harvard University, Cambridge, Massachusetts, 97540–97544.
National Museum of Natural History, Washington, D.C., USA, C5536.
Associated Minerals at Type Locality:
Reference:
Palache, C. (1938) Leightonite, a new sulphate of copper from Chile. American Mineralogist: 23: 34-37.

Other Language Names for LeightoniteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
4 photos of Leightonite associated with NatrochalciteNaCu2(SO4)2(OH) · 2H2O
3 photos of Leightonite associated with BellingeriteCu3(IO3)6 · 2H2O
2 photos of Leightonite associated with MarshiteCuI
1 photo of Leightonite associated with ParatacamiteCu3(Cu,Zn)(OH)6Cl2
1 photo of Leightonite associated with AtacamiteCu2(OH)3Cl

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.Ammoniovoltaite(NH4)2Fe2+5Fe3+3Al(SO4)12(H2O)18Iso. m3m (4/m 3 2/m) : Fd3c
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) : Pa3
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.30KröhnkiteNa2Cu(SO4)2 · 2H2OMon. 2/m : P21/b
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.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 - Dana Grouping (8th Ed.)Hide

29.4.5.1PolyhaliteK2Ca2Mg(SO4)4 · 2H2OTric. 1

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
25.2.11KröhnkiteNa2Cu(SO4)2 · 2H2OMon. 2/m : P21/b
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
25.2.16EuchlorineKNaCu3(SO4)3OMon.
25.2.17DevillineCaCu4(SO4)2(OH)6 · 3H2OMon. 2/m : P21/b
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. 2/m : P21/m
25.2.24RansomiteCuFe2(SO4)4 · 6H2OMon. 2/m : P21/b
25.2.26KlyuchevskiteK3Cu3(Fe3+,Al)(SO4)4O2Mon.
25.2.27Poitevinite(Cu,Fe)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 LeightoniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Palache, C. (1938) Leightonite, a new sulphate of copper from Chile. American Mineralogist: 23: 34-37.
Peacock, M.A. (1938) The relation of leightonite to polyhalite. American Mineralogist: 23: 38-45.
Bandy, M.C. (1938) Mineralogy of three sulphate deposits of Northern Chile. American Mineralogist: 23: 669-760.
Van Loan, Paul R. (1962) An x-ray study of leightonite. Canadian Mineralogist: 7: 272-277.
Menchetti, S., Bindi, L., Bonzzi, P., Olmi, F. (2002) Disordered distribution of Cu in the crystal structure of leightonite, K2Ca2Cu(SO4)4·2H2O. American Mineralogist: 87: 721-725.

Internet Links for LeightoniteHide

Localities for LeightoniteHide

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.
Austria
 
  • Tyrol
No reference listed
Canada
 
  • Saskatchewan
Shang, Y. (2000). Mineralogy, lithostratigraphy and geochemistry of North Ingebright Lake, Saskatchewan, Canada. PhD thesis University of Manitoba.
Chile (TL)
 
  • Antofagasta
    • El Loa Province
      • Calama
        • Chuquicamata District
Palache, Charles, Harry Berman & Clifford Frondel (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, 1124 pp.: 21, 315; American Mineralogist (1938): 23: 34-37.
Lapis 1/2008, p. 12 ["Mina Salvadora, Sierra Gorda"]
    • Tocopilla province
      • Sierra Gorda district
        • Caracoles
Maurizio Dini, Dr. Jochen Schluter.; http://www.lrz-muenchen.de/~mineralogische-sammlungen-dmg/analysen/leightonit.htm
Greece
 
  • Attica
    • East Attica
      • Lavreotiki
        • Lavrion District Mines
Rieck, B., Kolitsch, U., Voudouris, P., Giester, G. and Tzeferis, P. (2018): Weitere Neufunde aus Lavrion, Griechenland. Mineralien-Welt 29 (5), 32-77 (in German).
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.
Namibia
 
  • Oshikoto Region
    • Tsumeb
Gebhard, G. (1999): Tsumeb II. A Unique Mineral Locality. GG Publishing, Grossenseifen, Germany
Norway
 
  • Oppland
    • Lom
      • Visdalen
Garmo, T.(1978): Mineralnotater. NAGS-nytt, 5 (1),6
Neumann, H. (1985): Norges Mineraler. Norges Geologiske Undersøkelse Skrifter 68, p.110
 
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