Guildite
A valid IMA mineral species - grandfathered
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About Guildite
Formula:
CuFe3+(SO4)2(OH) · 4H2O
Colour:
Brown, yellow
Lustre:
Vitreous
Hardness:
2½
Specific Gravity:
2.72
Crystal System:
Monoclinic
Name:
Named by Carl Lausen in 1928 in honor of Frank Nelson Guild (28 December 1870, Jaffrey, New Hampshire, U.S.A - 12 March 1939, Tucson, Arizona, U.S.A.), professor at the University of Arizona. He was an expert in optical mineralogy and silver mineral paragenesis.
This mineral was formed under anthropogenic conditions (mine fire; Lausen, 1928) and would not be approved as a mineral species under current international rules.
Unique Identifiers
Mindat ID:
1770
Long-form identifier:
mindat:1:1:1770:7
GUID
(UUID V4):
(UUID V4):
9c185b04-59b7-4f61-8477-db2fa137e6ec
IMA Classification of Guildite
Approved, 'Grandfathered' (first described prior to 1959)
First published:
1928
Classification of Guildite
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
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
31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
9 : (AB)(XO4)Zq·xH2O
25.2.23
25 : Sulphates
2 : Sulphates of Cu and Ag
25 : Sulphates
2 : Sulphates of Cu and Ag
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Gdi | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Guildite
Vitreous
Transparency:
Translucent
Colour:
Brown, yellow
Streak:
Pale yellow
Hardness:
2½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
On {001} and {100}, perfect.
On {001} and {100}, perfect.
Fracture:
Conchoidal
Density:
2.72 g/cm3 (Measured)
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.
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.
Chemistry of Guildite
Mindat Formula:
CuFe3+(SO4)2(OH) · 4H2O
Crystallography of Guildite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Setting:
P21/m
Cell Parameters:
a = 9.78 Å, b = 7.13 Å, c = 7.26 Å
β = 105.3°
β = 105.3°
Ratio:
a:b:c = 1.372 : 1 : 1.018
Unit Cell V:
488.31 ų (Calculated from Unit Cell)
Morphology:
Crystals short prismatic, pseudo-cubic to 5 mm diameter. Forms include {001}, {100}, {110}, {540}, {011}, and others. The form {010} was not observed in type material.
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
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Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Display Options
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
View
CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
Stop | Start
Stop | Start
Labels
Console Off | On | Grey | Yellow
Console Off | On | Grey | Yellow
Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0000661 | Guildite | Wan C, Ghose S, Rossman G R (1978) Guildite, a layer structure with a ferric hydroxy-sulphate chain and its optical absorption spectra American Mineralogist 63 478-483 | 1978 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
9.46 Å | (35) |
4.998 Å | (27) |
3.606 Å | (20) |
3.144 Å | (100) |
2.909 Å | (11) |
2.355 Å | (10) |
2.076 Å | (12) |
Comments:
Laughon, 1970.
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 7: Great Oxidation Event | <2.4 |
47b : [Sulfates and sulfites] | |
Stage 10b: Anthropogenic minerals | <10 Ka |
55 : Anthropogenic mine minerals |
Type Occurrence of Guildite
General Appearance of Type Material:
Individual crystals varying in size up to 5 mm.
Place of Conservation of Type Material:
National Museum of Natural History (Smithsonian Institution), Washington, D.C., USA, #95950.
Geological Setting of Type Material:
Burning pyritic ore body.
Associated Minerals at Type Locality:
Other Language Names for Guildite
Common Associates
Associated Minerals Based on Photo Data:
1 photo of Guildite associated with Magnesiocopiapite | MgFe3+4(SO4)6(OH)2 · 20H2O |
1 photo of Guildite associated with Ransomite | CuFe2(SO4)4 · 6H2O |
Related Minerals - Strunz-mindat Grouping
7.DC.05 | Aluminite | Al2(SO4)(OH)4 · 7H2O |
7.DC.05 | Meta-aluminite | Al2(SO4)(OH)4 · 5H2O |
7.DC.10 | Butlerite | Fe3+(SO4)(OH) · 2H2O |
7.DC.10 | Parabutlerite | Fe3+(SO4)(OH) · 2H2O |
7.DC.15 | Fibroferrite | Fe3+(SO4)(OH) · 5H2O |
7.DC.20 | Xitieshanite | Fe3+(SO4)Cl · 6H2O |
7.DC.25 | Botryogen | MgFe3+(SO4)2(OH) · 7H2O |
7.DC.25 | Zincobotryogen | (Zn,Mg,Mn2+)Fe3+(SO4)2(OH) · 7H2O |
7.DC.30 | Chaidamuite | ZnFe3+(SO4)2(OH) · 4H2O |
7.DC.40 | Pauladamsite | Cu4(SeO3)(SO4)(OH)4 · 2H2O |
7.DC.45 | Riotintoite | Al(SO4)(OH) · 3H2O |
7.DC.50 | Thorneite | Pb6(Te6+2O10)(CO3)Cl2(H2O) |
7.DC.55 | Vendidaite | Al2(SO4)(OH)3Cl · 6H2O |
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.
Internet Links for Guildite
mindat.org URL:
https://www.mindat.org/min-1770.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Guildite
Reference List:
Localities for Guildite
Locality List
- 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.
All localities listed without proper references should be considered as questionable.
Australia | |
| Ashley et al. (1999) |
Canada | |
| Schindler et al. (2012) |
Slovakia | |
| Pauliš |
USA (TL) | |
| Lausen (1928) +3 other references |
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United Verde Mine, Jerome, Verde Mining District, Black Hills, Yavapai County, Arizona, USA