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Gilalite

A valid IMA mineral species
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About GilaliteHide

04656530017058760303335.jpg
Seal of Gila County, AZ
Formula:
Cu5Si6O17 · 7H2O
Colour:
Translucent green, blue-green
Hardness:
2
Specific Gravity:
2.72
Crystal System:
Monoclinic
Name:
For Gila Co., Arizona, USA, where it was found. It is pronounced hee'-lah-lite.
This page provides mineralogical data about Gilalite.


Unique IdentifiersHide

Mindat ID:
1691
Long-form identifier:
mindat:1:1:1691:5
GUID
(UUID V4):
34ca014e-9782-43e0-872d-49df55797b9c

IMA Classification of GilaliteHide

Classification of GilaliteHide

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

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
GilIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of GilaliteHide

Transparency:
Transparent, Translucent
Comment:
Nonmetallic
Colour:
Translucent green, blue-green
Hardness:
Tenacity:
Waxy
Density:
2.72(5) g/cm3 (Measured)    2.54 g/cm3 (Calculated)

Optical Data of GilaliteHide

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
Optical Extinction:
Blades extinguish up to 8° from Z || length.
Pleochroism:
Weak
Comments:
Weak in drab grayish green.
Comments:
2Vmeasured = Very small.
Absorption: Z > X = Y.

Chemistry of GilaliteHide

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

Crystallography of GilaliteHide

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)
Z:
4
Comment:
Neither point group nor space group known.

X-Ray Powder DiffractionHide

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

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 3b: Earth’s earliest hydrosphere>4.45
12 : Hadean hydrothermal subsurface sulfide deposits (see also #33)
Stage 7: Great Oxidation Event<2.4
47a : [Near-surface hydration of prior minerals]
Stage 10b: Anthropogenic minerals<10 Ka
56 : Slag and smelter minerals (see also #51 and #55)

Type Occurrence of GilaliteHide

General Appearance of Type Material:
Spherules of radial fibers up to 0.2 mm or more in length.
Place of Conservation of Type Material:
The Natural History Museum, London, England, 1980,533; University of Arizona, Tucson, Arizona; National Museum of Natural History, Washington, D.C., USA, 150201.
Geological Setting of Type Material:
Retrograde or mesogene mineral occurring in tactites.
Associated Minerals at Type Locality:
Reference:
Cesbron, F.P., Williams, S.A. (1980): Apachite and gilalite, two new copper silicates from Christmas, Arizona. Mineralogical Magazine, 43, 639-641.

Synonyms of GilaliteHide

Other Language Names for GilaliteHide

German:Gilalit
Spanish:Gilalita

Common AssociatesHide

Associated Minerals Based on Photo Data:
56 photos of Gilalite associated with KinoiteCa2Cu2(H2O)2[Si3O10]
21 photos of Gilalite associated with Apophyllite GroupAB4[Si8O22]X · 8H2O
13 photos of Gilalite associated with RuiziteCa2Mn3+2[Si4O11(OH)2](OH)2 · 2H2O
12 photos of Gilalite associated with QuartzSiO2
9 photos of Gilalite associated with ApachiteCu9Si10O29 · 11H2O
9 photos of Gilalite associated with Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
7 photos of Gilalite associated with Hydroxyapophyllite-(K)KCa4(Si8O20)(OH,F) · 8H2O
2 photos of Gilalite associated with CupriteCu2O
2 photos of Gilalite associated with JunitoiteCaZn2Si2O7 · H2O
2 photos of Gilalite associated with BrochantiteCu4(SO4)(OH)6

Related Minerals - Strunz-mindat GroupingHide

9.HE.10ApachiteCu9Si10O29 · 11H2OMon.

Other InformationHide

Notes:
Easily soluble in cold, dilute HNO3 or HCl.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for GilaliteHide

References for GilaliteHide

Localities for GilaliteHide

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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Brazil
 
Rob Lavinsky
  • Paraíba
    • Salgadinho
Gems & Gemology Magazine Fall 2005 ...
Greece
 
  • Attica
    • East Attica
      • Lavreotiki
58. +1 other reference
Italy
 
  • Lombardy
    • Lecco Province
      • Introbio
Vergani et al. (2020)
      • Valsassina
        • Introbio
Vergani et al. (2020)
USA (TL)
 
  • Arizona
    • Gila County
      • Banner Mining District
        • Christmas
Cesbron et al. (1980) +1 other reference
Eckhard D. Stuart
  • Nevada
    • Clark County
      • Spring Mountains
        • Goodsprings Mining District
Castor et al. (2004)
 
Mineral and/or Locality  
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