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(K,Na)Cu7AlSi9O24(OH)6 · 3H2O
Bluish green
Specific Gravity:
Crystal System:
Named after the type locality, the New Cornelia mine in Ajo, Arizona, USA (
See also Best Minerals article on ajoite: Currier, R., Revheim O. (2016): Ajoite. revision 2.1 Mindat Best Minerals Project, article "mesg-66-124530":

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Classification of AjoiteHide

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

9 : SILICATES (Germanates)
E : Phyllosilicates
A : Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings

78 : Unclassified Silicates
5 :

16 : Silicates Containing Aluminum and other Metals
5 : Aluminosilicates of Cs, NH4 and Cu

Physical Properties of AjoiteHide

Bluish green
Greenish white
on {010}
2.96 g/cm3 (Measured)    2.951 g/cm3 (Calculated)

Optical Data of AjoiteHide

Biaxial (+)
RI values:
nα = 1.550 nβ = 1.583 nγ = 1.641
Measured: 68° to 80°, Calculated: 76°
Max Birefringence:
δ = 0.091
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
r < v strong
X= very light bluish green
Y=Z= brilliant bluish green

Chemical Properties of AjoiteHide

(K,Na)Cu7AlSi9O24(OH)6 · 3H2O
IMA Formula:
K3Cu2+20Al3Si29O76(OH)16 · 8H2O
Common Impurities:

Crystallography of AjoiteHide

Crystal System:
Cell Parameters:
a = 13.63 Å, b = 14.5 Å, c = 13.62 Å
α = 107.16°, β = 105.45°, γ = 110.57°
a:b:c = 0.94 : 1 : 0.939
Unit Cell V:
2,192.29 ų (Calculated from Unit Cell)
As sprays of bladed prismatic crystals, to 0.4 mm; commonly fibrous.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
12.25 (100)
4.08 (10)
3.381 (8)
3.061 (10)
2.832 (8)
2.455 (12)
2.258 (8)

Type Occurrence of AjoiteHide

Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA, 113220.
Associated Minerals at Type Locality:

Other Language Names for AjoiteHide

Traditional Chinese:斜矽鋁銅礦

Common AssociatesHide

CreaseyitePb2Cu2Fe3+2(Si4.67Al0.33)O15.33(OH)3 · H2O
CreaseyitePb2Cu2Fe3+2(Si4.67Al0.33)O15.33(OH)3 · H2O
Associated Minerals Based on Photo Data:
Quartz108 photos of Ajoite associated with Quartz on
Shattuckite17 photos of Ajoite associated with Shattuckite on
Papagoite13 photos of Ajoite associated with Papagoite on
Hematite8 photos of Ajoite associated with Hematite on
Copper7 photos of Ajoite associated with Copper on
Kaolinite4 photos of Ajoite associated with Kaolinite on
Olivenite3 photos of Ajoite associated with Olivenite on
Sillénite3 photos of Ajoite associated with Sillénite on
Mottramite3 photos of Ajoite associated with Mottramite on
Duhamelite3 photos of Ajoite associated with Duhamelite on

Related Minerals - Nickel-Strunz GroupingHide

9.EA.05CuprorivaiteCaCuSi4O10Tet. 4/mmm (4/m 2/m 2/m) : P4/ncc
9.EA.05EffenbergeriteBaCuSi4O10Tet. 4/mmm (4/m 2/m 2/m) : P4/ncc
9.EA.10EkaniteCa2ThSi8O20Tet. 4 2 2 : I4 2 2
9.EA.15Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2OTet. 4/mmm (4/m 2/m 2/m) : P4/mnc
9.EA.15Hydroxyapophyllite-(K)KCa4(Si8O20)(OH,F) · 8H2OTet.
9.EA.15Fluorapophyllite-(Na)NaCa4(Si8O20)F · 8H2OOrth.
9.EA.20MagadiiteNa2Si14O29 · 11H2OMon.
9.EA.30Sazhinite-(La)Na3La[Si6O15] · 2H2OOrth. mm2 : Pmm2
9.EA.35ArmstrongiteCaZr[Si6O15] · 3H2OMon.
9.EA.40OkeniteCa10Si18O46 · 18H2OTric. 1 : P1
9.EA.45NekoiteCa3Si6O15·7H2OTric. 1 : P1
9.EA.50CavansiteCa(VO)Si4O10 · 4H2OOrth. mmm (2/m 2/m 2/m)
9.EA.55PentagoniteCa(VO)Si4O10 · 4H2OOrth. mm2
9.EA.60PenkvilksiteNa4Ti2Si8O22 · 4H2OOrth. mmm (2/m 2/m 2/m) : Pbcn
9.EA.60TumchaiteNa2Zr(Si4O11) · 2H2OMon.
9.EA.65NabesiteNa2BeSi4O10 · 4H2OOrth. 2 2 2 : P21 21 21
9.EA.75ZeravshaniteNa2Cs4Zr3[Si18O45]*2H2OMon. 2/m : B2/b
9.EA.80Bussyite-(Ce)(Ce,REE)3(Na,H2O)6MnSi9Be5(O,OH)30F4Mon. 2/m : B2/b
9.EA.85PlumbophyllitePb2Si4O10 · H2OOrth. mmm (2/m 2/m 2/m) : Pbcn

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

16.5.1Pollucite(Cs,Na)2(Al2Si4O12) · 2H2OIso. m3m (4/m 3 2/m) : Ia3d
16.5.3Buddingtonite(NH4)(AlSi3)O8Mon. 2 : P21

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 AjoiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Schaller, W.T., Vlisidis, A.C. (1958) Ajoite, a new hydrous aluminum copper silicate. American Mineralogist: 43: 1107-1111.
Chao, G.Y. (1981) Ajoite: new data. American Mineralogist: 66: 201-203.
Pluth, J.J., Smith, J.V. (2002) Arizona porphyry copper/hydrothermal deposits II: Crystal structure of ajoite, (K + Na)3Cu20Al3Si29O76(OH)16~8H2O. Proceedings of the National Academy of Sciences of the United States of America: 99: 11002-11005.
U. Kolitsch (unpublished structure refinement, 2002)

Internet Links for AjoiteHide

Localities for AjoiteHide

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.
  • Carinthia
    • Karawanken
      • Finkenstein
        • Mallestiger Mittagskogel
  • Vorarlberg
    • Montafon
      • Verwall Alps (Verwall Group)
        • Rinder valley (Gafluna valley)
Niedermayr, G. et al. (1996): Carinthia II, 186./106., 111-151.
  • North Rhine-Westphalia
    • Sauerland
      • Meschede
Schnorrer-Köhler, G., (1990): Ramsbeck - Neue Minerale aus dem ehemaligen Blei-Zink-Erzrevier des Sauerlandes, Der Aufschluss, Vol. 41 (4), 211-218
  • Honshu Island
    • Kanto region
      • Tochigi Prefecture
        • Nikko City
          • Ashio-machi
Numao et al (2005) Chigaku Kenkyu, 53, 213-220.
  • Kunene Region
    • Khorixas District
      • Mesopotamia Copper Valley
Gerhard Niedermayr: Mesopotamia 504 - die Typlokalität des Namibit
  • Suceava Co.
    • Suceava district
      • Iacobeni (Jakobeny; Jacobeny; Jakabfalva)
South Africa
  • Limpopo Province
    • Vhembe District
Cairncross, B. (1991) The Messina Mining District, South Africa. Mineralogical Record 22(3) 187-199; Cairncross, B., and Dixon, R., (1995) Minerals of South Africa. The Geological Society of South Africa, Linden 2014, RSA
Minerals of South Africa
  • Arizona
    • Maricopa Co.
      • Big Horn Mts
        • Osborn District
          • Hummingbird Spring
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 103; Williams, S.A. (1968), Wickenburgite, a new mineral from Arizona, Am.Min.: 53: 1433-1438.
      • Vulture Mts
        • Vulture District
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 103, 192; Williams, S.A. (1968), Wickenburgite, a new mineral from AZ, Am.Min.: 53: 1433-1438; Williams, S.A. & R.A. Bideaux (1975), Creaseyite, Cu2Pb2(Fe,Al)2Si5O17·6H2O, a new mineral from Arizona and Sonora, Mineralogical Magazine: 40: 227-231.
    • Pima Co.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 193; Sun, M.S. (1961), Differential thermal analysis of shattuckite, Am.Min.: 46: 67-77.
        • Little Ajo Mts
          • Ajo
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 316, 319-320; Schaller, W.T. & A.C. Vlisidis (1958), Ajoite, a new hydrous aluminum copper silicate, Am.Min.: 43: 1107-1111; Hutton, C.O. & A.C. Vlisidis (1960), Papagoite, a new copper-bearing mineral from Ajo, AZ, Am.Min.: 45: 599-611; Sun, M.S. (1961), Differential analysis of shattuckite, Am.Min.: 46: 67-77; Newberg, D.W. (1964), X-ray study of shattuckite, Am.Min.: 49: 1234-1239; Thomas, W.J. & R.B. Gibbs (1983), Famous mineral localities: The New Cornelia mine, Ajo, AZ, Min.Rec.: 14: 283-298; Clark, 1993 - "Hey's Mineral Index, 3rd Edition"; Galbraith, F.W. & D.J. Brennan (1959), Minerals of AZ: 111.
    • Pinal Co.
      • Galiuro Mts
        • Bunker Hill District (Copper Creek District)
In the collection of Brent Thorne.
Mr. Joe Ruiz.
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