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Gilalite

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Formula:
Cu5Si6O17 · 7H2O
Colour:
Translucent green, blue-green
Hardness:
2
Crystal System:
Monoclinic
This page provides mineralogical data about Gilalite.


Classification of Gilalite

Approved
9.HE.05

9 : SILICATES (Germanates)
H : Unclassified silicates
E : With Cu, Zn
78.4.4.1

78 : Unclassified Silicates
4 :
14.2.4

14 : Silicates not Containing Aluminum
2 : Silicates of Cu

Physical Properties of Gilalite

Colour:
Translucent green, blue-green
Hardness:

Optical Data of Gilalite

Type:
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:
Moderate
Dispersion:
none

Chemical Properties of Gilalite

Formula:
Cu5Si6O17 · 7H2O
Common Impurities:
Mn,Mg,Ca

Crystallography of Gilalite

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

X-Ray Powder Diffraction

Powder Diffraction Data:
d-spacingIntensity
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

German:Gilalit
Spanish:Gilalita

Common Associates

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

Related Minerals - Nickel-Strunz Grouping

9.HE.10ApachiteCu9Si10O29 · 11H2O

Related Minerals - Hey's Chemical Index of Minerals Grouping

14.2.1DioptaseCuSiO3 · H2O
14.2.2ShattuckiteCu5(Si2O6)2(OH)2
14.2.3PlancheiteCu8(Si8O22)(OH)4 · H2O
14.2.5ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
14.2.6LitidioniteCuNaKSi4O10
14.2.7ReinhardbraunsiteCa5(SiO4)2(OH,F)2
14.2.8CuprorivaiteCaCuSi4O10
14.2.9KinoiteCa2Cu2(H2O)2[Si3O10]
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

mindat.org URL:
https://www.mindat.org/min-1691.html
Please feel free to link to this page.
Specimens:
The following Gilalite specimens are currently listed for sale on minfind.com.

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.
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 (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, 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
Mineral and/or Locality  
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