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Cu5Si6O17 · 7H2O
Translucent green, blue-green
Crystal System:
This page provides mineralogical data about Gilalite.

Classification of Gilalite


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

78 : Unclassified Silicates
4 :

14 : Silicates not Containing Aluminum
2 : Silicates of Cu

Physical Properties of Gilalite

Translucent green, blue-green

Optical Data of Gilalite

Biaxial (-)
RI values:
nα = 1.560 nβ = 1.635 nγ = 1.635
Max Birefringence:
δ = 0.075
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:

Chemical Properties of Gilalite

Cu5Si6O17 · 7H2O
Common Impurities:

Crystallography of Gilalite

Crystal System:
Cell Parameters:
a = 13.38 Å, b = 19.16 Å, c = 9.02 Å
β = 90°
a:b:c = 0.698 : 1 : 0.471
Unit Cell V:
2,312.37 ų (Calculated from Unit Cell)
Neither point group nor space group known.

X-Ray Powder Diffraction

Powder Diffraction Data:
13.4 (100)
7.786 (50)
4.790 (40)
3.897 (40)
10.97 (30)
6.684 (30)
3.315 (30)

Type Occurrence of Gilalite

Synonyms of Gilalite

Other Language Names for Gilalite


Common Associates

Associated Minerals Based on Photo Data:
Kinoite29 photos of Gilalite associated with Kinoite on
Apophyllite15 photos of Gilalite associated with Apophyllite on
Quartz12 photos of Gilalite associated with Quartz on
Ruizite4 photos of Gilalite associated with Ruizite on
Hydroxyapophyllite-(K)4 photos of Gilalite associated with Hydroxyapophyllite-(K) on
Cuprite2 photos of Gilalite associated with Cuprite on
Apachite2 photos of Gilalite associated with Apachite on
Brochantite2 photos of Gilalite associated with Brochantite on
Copper1 photo of Gilalite associated with Copper on

Related Minerals - Nickel-Strunz Grouping

9.HE.10ApachiteCu9Si10O29 · 11H2O

Related Minerals - Hey's Chemical Index of Minerals Grouping

14.2.1DioptaseCuSiO3 · H2O
14.2.3PlancheiteCu8(Si8O22)(OH)4 · H2O
14.2.5ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
14.2.10StringhamiteCaCu(SiO4) · H2O
14.2.11ApachiteCu9Si10O29 · 11H2O

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 Gilalite

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 URL:
Please feel free to link to this page.
The following Gilalite specimens are currently listed for sale on

Localities for Gilalite

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.
(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.
Rob Lavinsky
  • Paraíba
    • Borborema mineral province
      • Salgadinho
Gems & Gemology Magazine Fall 2005 article, volume 41, issue 3.
  • 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.
  • 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, Mineralogical Magazine: 43: 639-641; Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 231, 428.
Eckhard D. Stuart
  • Nevada
    • Clark Co.
      • Spring Mts
        • Goodsprings District
NBMG Spec. Pub. 31 Minerals of Nevada
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