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Gilalite

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Formula:
Cu5Si6O17 · 7H2O
System:
Monoclinic
Colour:
Translucent green, ...
Hardness:
2
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
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Type Occurrence of Gilalite

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 Data:
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
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
Essential elements:
All elements listed in formula:
Common Impurities:
Mn,Mg,Ca

Relationship of Gilalite to other Species

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 (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
14.2.11ApachiteCu9Si10O29 · 11H2O

Other Names for Gilalite

Name in Other Languages:
German:Gilalit
Spanish:Gilalita

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:
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

Specimens:
The following Gilalite specimens are currently listed for sale on minfind.com.

Localities for Gilalite

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, Min.Mag.: 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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