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Apachite

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Formula:
Cu9Si10O29 · 11H2O
System:
Monoclinic
Colour:
Blue ("faience-blue")
Name:
Named for the Apache tribe that live in the area of the Christmas Mine
Note: specimens of acicular dioptase haven been erroneously sold as apachite.

Classification of Apachite

Approved
9.HE.10

9 : SILICATES (Germanates)
H : Unclassified silicates
E : With Cu, Zn
78.4.1.1

78 : Unclassified Silicates
4 :
14.2.11

14 : Silicates not Containing Aluminum
2 : Silicates of Cu
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Type Occurrence of Apachite

Year of Discovery:
1980

Physical Properties of Apachite

Colour:
Blue ("faience-blue")

Crystallography of Apachite

Crystal System:
Monoclinic
Cell Parameters:
a = 12.89Å, b = 6.05Å, c = 19.11Å
β = 90.42°
Ratio:
a:b:c = 2.131 : 1 : 3.159
Unit Cell Volume:
V 1,490.24 ų (Calculated from Unit Cell)

Optical Data of Apachite

Type:
Biaxial (-)
RI values:
nα = 1.610 nβ = 1.650 nγ = 1.650
Max Birefringence:
δ = 0.040
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
relatively strong

Chemical Properties of Apachite

Formula:
Cu9Si10O29 · 11H2O
Essential elements:
All elements listed in formula:
Common Impurities:
Mg,Ca

Relationship of Apachite to other Species

14.2.1DioptaseCuSiO3 · H2O
14.2.2ShattuckiteCu5(Si2O6)2(OH)2
14.2.3PlancheiteCu8(Si8O22)(OH)4 · H2O
14.2.4GilaliteCu5Si6O17 · 7H2O
14.2.5ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O (x < 1)
14.2.6LitidioniteCuNaKSi4O10
14.2.7ReinhardbraunsiteCa5(SiO4)2(OH,F)2
14.2.8CuprorivaiteCaCu[Si4O10]
14.2.9KinoiteCa2Cu2(H2O)2[Si3O10]
14.2.10StringhamiteCaCu(SiO4) · H2O

Other Names for Apachite

Name in Other Languages:
German:Apachit
Spanish:Apachita

Other Information

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 Apachite

Reference List:
Cesbron, F.P. and S.A. Williams (1980): Apachite and gilalite, two new copper silicates from Christmas, Arizona. Mineral. Mag., 43, 639-641. [Abs. in American Mineralogist: 65: 1065]

Internet Links for Apachite

Localities for Apachite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Namibia
 
  • Kunene Region
    • Kaokoveld Plateau
Bowell, R J et al (2013) Minerals of the Kaokoveld District, Kunene Region, Namibia. Mineralogical Record 44:485-504
USA (TL)
 
  • Arizona
    • Gila Co.
      • Dripping Spring Mts
        • Banner District
          • Christmas area
            • Christmas
Cesbron, F.P. & S.A. Williams (1980), Apachite and gilalite, two new copper silicates from Christmas, AZ, Min.Mag.: 43: 639-641; Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 116, 428.
  • New Mexico
    • Socorro Co.
      • Abbey District
Minerals of New Mexico 3rd ed.
Mineral and/or Locality  
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