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Guildite

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Formula:
CuFe
3+
 
(SO
 
4
)
 
2
(OH) · 4H
 
2
O
System:MonoclinicColour:Brown, yellow
Lustre:VitreousHardness:
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

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:6/D.10-100
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:31.9.7.1

31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
9 : (AB)(XO4)Zq·xH2O
Hey's CIM Ref.:25.2.23

25 : Sulphates
2 : Sulphates of Cu and Ag
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Type Occurrence of Guildite

Type Locality:United Verde Mine (The Big Hole; Big Hole property; Hull Mine; Hopewell tunnel; Patented claim 3480; Patented claim 2812; Patented claims 3348), Jerome, Verde District, Black Hills (Black Hill Range), Yavapai Co., Arizona, USA
Year of Discovery:1928
Geological Setting of type material:Burning pyritic ore body.
Associated Minerals at type locality:
Coquimbite

Physical Properties of Guildite

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

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
Maximum Birefringence:δ = 0.059 - 0.061

Chart 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:
CuFe
3+
 
(SO
 
4
)
 
2
(OH) · 4H
 
2
O
Simplified for copy/paste:CuFe3+(SO4)2(OH)·4H2O
Essential elements:Cu, Fe, H, O, S
All elements listed in formula:Cu, Fe, H, O, S

Relationship of Guildite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
7.DC.05Aluminite
Al
 
2
(SO
 
4
)(OH)
 
4
· 7H
 
2
O
7.DC.05Meta-aluminite
Al
 
2
(SO
 
4
)(OH)
 
4
· 5H
 
2
O
7.DC.10Butlerite
Fe
3+
 
(SO
 
4
)(OH) · 2H
 
2
O
7.DC.10Parabutlerite
Fe
3+
 
(SO
 
4
)(OH) · 2H
 
2
O
7.DC.15Fibroferrite
Fe
3+
 
(SO
 
4
)(OH) · 5H
 
2
O
7.DC.20Xitieshanite
Fe
3+
 
(SO
 
4
)Cl · 6H
 
2
O
7.DC.25Botryogen
MgFe
3+
 
(SO
 
4
)
 
2
(OH) · 7H
 
2
O
7.DC.25Zincobotryogen
(Zn,Mg,Mn
2+
 
)Fe
3+
 
(SO
 
4
)
 
2
(OH) · 7H
 
2
O
7.DC.30Chaidamuite
ZnFe
3+
 
(SO
 
4
)
 
2
(OH) · 4H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
25.2.1Chalcocyanite
CuSO
 
4
25.2.2Bonattite
CuSO
 
4
· 3H
 
2
O
25.2.3Chalcanthite
CuSO
 
4
· 5H
 
2
O
25.2.4Boothite
CuSO
 
4
· 7H
 
2
O
25.2.5Dolerophanite
Cu
 
2
(SO
 
4
)O
25.2.6Antlerite
Cu
 
3
(SO
 
4
)(OH)
 
4
25.2.7Brochantite
Cu
 
4
(SO
 
4
)(OH)
 
6
25.2.8Posnjakite
Cu
 
4
(SO
 
4
)(OH)
 
6
· H
 
2
O
25.2.9Langite
Cu
 
4
(SO
 
4
)(OH)
 
6
· 2H
 
2
O
25.2.10Wroewolfeite
Cu
 
4
(SO
 
4
)(OH)
 
6
· 2H
 
2
O
25.2.11Kröhnkite
Na
 
2
Cu(SO
 
4
)
 
2
· 2H
 
2
O
25.2.12Natrochalcite
NaCu
 
2
(SO
 
4
)
 
2
(OH) · 2H
 
2
O
25.2.13Piypite
K
 
2
Cu
 
2
(SO
 
4
)
 
2
O
25.2.14Fedotovite
K
 
2
Cu
 
3
(SO
 
4
)
 
3
O
25.2.15Cyanochroite
K
 
2
Cu(SO
 
4
)
 
2
· 6H
 
2
O
25.2.16Euchlorine
KNaCu
 
3
(SO
 
4
)
 
3
O
25.2.17Devilline
CaCu
 
4
(SO
 
4
)
 
2
(OH)
 
6
· 3H
 
2
O
25.2.18Leightonite
K
 
2
Ca
 
2
Cu(SO
 
4
)
 
4
· 2H
 
2
O
25.2.19Chalcoalumite
CuAl
 
4
(SO
 
4
)(OH)
 
12
· 3H
 
2
O
25.2.20Cyanotrichite
Cu
 
4
Al
 
2
(SO
 
4
)(OH)
 
12
· 2H
 
2
O
25.2.21Woodwardite
Cu
 
1-x
Al
 
x
(OH)
 
2
[SO
 
4
]
 
x/2
· nH
 
2
O
25.2.22Campigliaite
Mn
2+
 
Cu
 
4
(SO
 
4
)
 
2
(OH)
 
6
· 4H
 
2
O
25.2.24Ransomite
CuFe
 
2
(SO
 
4
)
 
4
· 6H
 
2
O
25.2.26Klyuchevskite
K
 
3
Cu
 
3
(Fe
3+
 
,Al)(SO
 
4
)
 
4
O
 
2
25.2.27Poitevinite
(Cu,Fe,Zn)SO
 
4
· H
 
2
O
25.2.28Argentojarosite
AgFe
3+
3
(SO
 
4
)
 
2
(OH)
 
6

Other Names for Guildite

Other Languages:
German:Guildit
Russian:Гильдит
Spanish:Guildita

Other Information

Health Warning: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

Search Engines:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Guildite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
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  • Localities for Guildite

    The 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. ? 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.
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    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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