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Gilalite

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Formula:
Cu
 
5
Si
 
6
O
 
17
· 7H
 
2
O
System:MonoclinicColour:Translucent green, ...
Hardness:2
This page provides mineralogical data about Gilalite.

Classification of Gilalite

IMA status:Approved
Strunz 8th edition ID:8/D.06-10
Nickel-Strunz 10th (pending) edition ID:9.HE.05

9 : SILICATES (Germanates)
H : Unclassified silicates
E : With Cu, Zn
Dana 8th edition ID:78.4.4.1

78 : Unclassified Silicates
4 :
Hey's CIM Ref.:14.2.4

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

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 Gilalite

Colour:Translucent green, blue-green
Hardness (Mohs):2

Crystallography of Gilalite

Crystal System:Monoclinic
Cell Parameters:a = 13.38Å, b = 19.16Å, c = 9.02Å
β = 90°
Ratio:a:b:c = 0.698 : 1 : 0.471
Unit Cell Volume:V 2,312.37 ų (Calculated from Unit Cell)
Comment:Neither point group nor space group known.
X-Ray Powder Diffraction:
d-spacingIntensity
13.4 (100)
7.786 (50)
4.790 (40)
3.897 (40)
10.97 (30)
6.684 (30)
3.315 (30)

Optical Data of Gilalite

Type:Biaxial (-)
RI values: nα = 1.560 nβ = 1.635 nγ = 1.635
Maximum Birefringence:δ = 0.075

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:none

Chemical Properties of Gilalite

Formula:
Cu
 
5
Si
 
6
O
 
17
· 7H
 
2
O
Simplified for copy/paste:Cu5Si6O17·7H2O
Essential elements:Cu, H, O, Si
All elements listed in formula:Cu, H, O, Si
Common Impurities:Mn,Mg,Ca

Relationship of Gilalite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.HE.10Apachite
Cu
 
9
Si
 
10
O
 
29
· 11H
 
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
14.2.5Chrysocolla
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
14.2.11Apachite
Cu
 
9
Si
 
10
O
 
29
· 11H
 
2
O

Other Names for Gilalite

Synonyms:
IMA1979-021
Other Languages:
German:Gilalit
Spanish:Gilalita

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 Gilalite

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 Gilalite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Gilalite details from Handbook of Mineralogy (PDF)
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  • Specimens:The following Gilalite specimens are currently listed for sale on minfind.com.
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  • Localities for Gilalite

    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.
    Brazil
     
    Rob Lavinsky
    • Paraíba
      • Borborema mineral province
        • Salgadinho
    Gems & Gemology Magazine Fall 2005 article, volume 41, issue 3.
    Greece
     
    • Attikí Prefecture (Attica; Attika)
      • Lavrion District (Laurion; Laurium)
    Schnorrer-Köhler, G., Standfuss, L. & Standfuss, K. (1991): Neue Funde aus den antiken Schlacken von Lavrion, Griechenland. Lapis, 16 (6), 21-23; 58.
    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.: 231, 428.
    Eckhard D. Stuart
    • Nevada
      • Clark Co.
        • Goodsprings District
    NBMG Spec. Pub. 31 Minerals of Nevada
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