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Apachite

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Formula:
Cu
 
9
Si
 
10
O
 
29
· 11H
 
2
O
System:MonoclinicColour: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

IMA status:Approved
Strunz 8th edition ID:8/D.06-20
Nickel-Strunz 10th (pending) edition ID:9.HE.10

9 : SILICATES (Germanates)
H : Unclassified silicates
E : With Cu, Zn
Dana 8th edition ID:78.4.1.1

78 : Unclassified Silicates
4 :
Hey's CIM Ref.:14.2.11

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

Type Locality:Christmas Mine (Red Bird shafts; Inspiration Mine; Hackberry shafts), Christmas, Christmas area, Banner District, Dripping Spring Mts, Gila Co., Arizona, USA
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
Maximum Birefringence:δ = 0.040

Chart 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:
Cu
 
9
Si
 
10
O
 
29
· 11H
 
2
O
Simplified for copy/paste:Cu9Si10O29·11H2O
Essential elements:Cu, H, O, Si
All elements listed in formula:Cu, H, O, Si
Common Impurities:Mg,Ca

Relationship of Apachite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.HE.05Gilalite
Cu
 
5
Si
 
6
O
 
17
· 7H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
14.2.1Dioptase
CuSiO
 
3
· H
 
2
O
14.2.2Shattuckite
Cu
 
5
(Si
 
2
O
 
6
)
 
2
(OH)
 
2
14.2.3Plancheite
Cu
 
8
(Si
 
8
O
 
22
)(OH)
 
4
· H
 
2
O
14.2.4Gilalite
Cu
 
5
Si
 
6
O
 
17
· 7H
 
2
O
14.2.5Chrysocolla
Cu
 
2-x
Al
 
x
(H
 
2-x
Si
 
2
O
 
5
)(OH)
 
4
· nH
 
2
O (x < 1)
14.2.6Litidionite
CuNaKSi
 
4
O
 
10
14.2.7Reinhardbraunsite
Ca
 
5
(SiO
 
4
)
 
2
(OH,F)
 
2
14.2.8Cuprorivaite
CaCu[Si
 
4
O
 
10
]
14.2.9Kinoite
Ca
 
2
Cu
 
2
(H
 
2
O)
 
2
[Si
 
3
O
 
10
]
14.2.10Stringhamite
CaCu(SiO
 
4
) · H
 
2
O

Other Names for Apachite

Synonyms:
IMA1979-022
Other Languages:
German:Apachit
Spanish:Apachita

Other Information

Health Warning: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

Search Engines:
  • Look for Apachite on Google
  • Look for Apachite images on Google
  • External Links:
  • Look for Apachite on Webmineral
  • Look for Apachite on Athena Mineralogy
  • Look for Apachite on Wikipedia
  • Look for Apachite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Apachite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
  • DAKOTA MATRIX offers Cabinet and Rare Species from Worldwide Localities.
  • Buy from Dave Bunk Minerals
  • SpiriferMinerals.com - high quality low prices
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  • Buy from David K Joyce minerals
  • Lapis Mineral Magazin
  • Fabre Minerals - search for Apachite specimens
  • Fine Minerals from Weinrich Minerals, Inc.
  • Find Apachite on www.crystalclassics.co.uk
  • Mineral Classics - Worldwide Collector Quality Minerals and Gems
  • Localities for Apachite

    The 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. ? 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
     
    • 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.
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