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Guildite

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Formula:
CuFe3+(SO4)2(OH) · 4H2O
System:
Monoclinic
Colour:
Brown, yellow
Lustre:
Vitreous
Hardness:
Name:
After Frank Nelson Guild (1870-1939), University of Arizona, USA
This mineral was formed under anthropogenic conditions (mine fire) and would not be approved as a mineral species under current international rules.

Classification of Guildite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
6/D.10-100
7.DC.30

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
C : With only medium-sized cations; chains of edge-sharing octahedra
31.9.7.1

31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
9 : (AB)(XO4)Zq·xH2O
25.2.23

25 : Sulphates
2 : Sulphates of Cu and Ag
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First Recorded Occurrence of Guildite

Year of Discovery:
1928
Geological Setting of First Recorded Material:
Burning pyritic ore body.
Associated Minerals at First Recorded Locality:

Physical Properties of Guildite

Vitreous
Diaphaneity (Transparency):
Translucent
Colour:
Brown, yellow
Streak:
Pale yellow
Hardness (Mohs):
Tenacity:
Brittle
Cleavage:
Perfect
On {001} and {100}, perfect.
Fracture:
Conchoidal
Density:
2.72 g/cm3 (Measured)    

Crystallography of Guildite

Crystal System:
Monoclinic
Cell Parameters:
a = 9.78Å, b = 7.13Å, c = 7.26Å
β = 105.3°
Ratio:
a:b:c = 1.372 : 1 : 1.018
Unit Cell Volume:
V 488.31 ų (Calculated from Unit Cell)
Morphology:
Crystals short prismatic, pseudo-cubic to .5 cm diameter.

Optical Data of Guildite

Type:
Biaxial (+)
RI values:
nα = 1.622 - 1.623 nβ = 1.628 - 1.630 nγ = 1.681 - 1.684
Max Birefringence:
δ = 0.059 - 0.061
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
relatively weak
Pleochroism:
Visible
Comments:
X = Light yellow Y = Light yellow Z = Greenish yellow
Comments:
2V small.

Chemical Properties of Guildite

Formula:
CuFe3+(SO4)2(OH) · 4H2O
Essential elements:
All elements listed in formula:

Relationship of Guildite to other Species

7.DC.05AluminiteAl2(SO4)(OH)4 · 7H2O
7.DC.05Meta-aluminiteAl2(SO4)(OH)4 · 5H2O
7.DC.10ButleriteFe3+(SO4)(OH) · 2H2O
7.DC.10ParabutleriteFe3+(SO4)(OH) · 2H2O
7.DC.15FibroferriteFe3+(SO4)(OH) · 5H2O
7.DC.20XitieshaniteFe3+(SO4)Cl · 6H2O
7.DC.25BotryogenMgFe3+(SO4)2(OH) · 7H2O
7.DC.25Zincobotryogen(Zn,Mg,Mn2+)Fe3+(SO4)2(OH) · 7H2O
7.DC.30ChaidamuiteZnFe3+(SO4)2(OH) · 4H2O
25.2.1ChalcocyaniteCuSO4
25.2.2BonattiteCuSO4 · 3H2O
25.2.3ChalcanthiteCuSO4 · 5H2O
25.2.4BoothiteCuSO4 · 7H2O
25.2.5DolerophaniteCu2(SO4)O
25.2.6AntleriteCu3(SO4)(OH)4
25.2.7BrochantiteCu4(SO4)(OH)6
25.2.8PosnjakiteCu4(SO4)(OH)6 · H2O
25.2.9LangiteCu4(SO4)(OH)6 · 2H2O
25.2.10WroewolfeiteCu4(SO4)(OH)6 · 2H2O
25.2.11KröhnkiteNa2Cu(SO4)2 · 2H2O
25.2.12NatrochalciteNaCu2(SO4)2(OH) · 2H2O
25.2.13PiypiteK2Cu2(SO4)2O
25.2.14FedotoviteK2Cu3(SO4)3O
25.2.15CyanochroiteK2Cu(SO4)2 · 6H2O
25.2.16EuchlorineKNaCu3(SO4)3O
25.2.17DevillineCaCu4(SO4)2(OH)6 · 3H2O
25.2.18LeightoniteK2Ca2Cu(SO4)4 · 2H2O
25.2.19ChalcoalumiteCuAl4(SO4)(OH)12 · 3H2O
25.2.20CyanotrichiteCu4Al2(SO4)(OH)12 · 2H2O
25.2.21WoodwarditeCu1-xAlx(OH)2[SO4]x/2 · nH2O
25.2.22CampigliaiteMn2+Cu4(SO4)2(OH)6 · 4H2O
25.2.24RansomiteCuFe2(SO4)4 · 6H2O
25.2.26KlyuchevskiteK3Cu3(Fe3+,Al)(SO4)4O2
25.2.27Poitevinite(Cu,Fe,Zn)SO4 · H2O
25.2.28ArgentojarositeAgFe33+(SO4)2(OH)6

Other Names for Guildite

Name in Other Languages:
German:Guildit
Spanish:Guildita

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 Guildite

Reference List:
Lausen (1928) American Mineralogist: 13: 203.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 619.

American Mineralogist (1970): 55: 501.

American Mineralogist (1978): 63: 478-483.

Internet Links for Guildite

Localities for Guildite

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.
Slovakia
 
  • Banská Bystrica Region
    • Banská Bystrica Co.
      • Poniky
Pauliš,P.,Ďuďa,R.,2002: Nejzajímavejší mineralogická naletište Slovenska. Kuttna,K.Hora, 136p
USA
 
  • Arizona
    • Yavapai Co.
      • Black Hills (Black Hill Range)
        • Verde District
          • Jerome
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 240; Lausen, C. (1928), Hydrous sulphates formed under fumerolic conditions at the United Verde mine, American Mineralogist: 13: 203-229; Laughon, R.B. (1970), New data on guildite, American Mineralogist: 55: 502-505; Galbraith, F.W. & Brennan (1959), Minerals of Arizona: 66.
Mineral and/or Locality  
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