Finescreekite
A valid IMA mineral species
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About Finescreekite
Formula:
[Pb4(OH)4](S2O3)2
Lustre:
Vitreous, Resinous
Hardness:
2½
Specific Gravity:
5.675 (Calculated)
Crystal System:
Orthorhombic
Name:
The name finescreekite is for Fines Creek, the nearest town to the mine (5.5 km due east), and for the creek itself, which runs through the town and comes within about 2.5 km of the mine. It is worthy of note that light reflecting off of the ridged faces of finescreekite crystals looks much like light reflecting off of ripples in a stream. Furthermore, the original name of Fines Creek (prior to the late 1700s) was Crystal Creek.
Another new thiosulfate from the Redmond mine; compare redmondite, hydroredmondite, hexathioplumbite, cubothioplubmite, hayelasdiite, and boojumite. Also comparable to steverustite and fassinaite.
Unique Identifiers
Mindat ID:
56158
Long-form identifier:
mindat:1:1:56158:9
Classification of Finescreekite
The cubane-like Pb4(OH)4 unit
The Pb4(OH)4 motif found in finescreekite. This cubane-like structural unit is also found in, for example, hexathioplumbite and nitroplumbite.
IMA Classification of Finescreekite
Approved
IMA Formula:
[Pb2+4(OH)4](S6+O3S2-)2
Approval history:
IMA no. 2022-030
Type description reference:
Kampf, Anthony R.; Smith, Jason B.; Hughes, John M.; Ma, Chi; Emproto, Christopher (2024) New Minerals from the Redmond Mine, North Carolina, USA: V. Finescreekite and Hayelasdiite, Two New Thiosulfate Minerals Containing Cubane-Like Pb4O4 Structural Units. The Canadian Journal of Mineralogy and Petrology, 62 (2). doi:10.3749/2300044
7.JA.
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
J : Thiosulfates
A : Thiosulfates of Pb
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
J : Thiosulfates
A : Thiosulfates of Pb
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 for Standard |
|---|---|---|
| Fnck | 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 Finescreekite
Vitreous, Resinous
Streak:
White
Hardness:
2½ on Mohs scale
Cleavage:
Perfect
excellent cleavage on {001}, fair on {100}, {010}, and {110}
excellent cleavage on {001}, fair on {100}, {010}, and {110}
Fracture:
Step-Like
Density:
5.675 g/cm3 (Calculated)
Optical Data of Finescreekite
Type:
Biaxial (-)
RI values:
nα = 2.00(1) nβ = 2.04 nγ = 2.065
2V:
Measured: 75.9° (5)
Max. Birefringence:
δ = 0.065
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate
Comments:
β = 2.04(calc), γ = 2.065(calc)
Chemistry of Finescreekite
Mindat Formula:
[Pb4(OH)4](S2O3)2
Element Weights:
Elements listed:
Crystallography of Finescreekite
Crystal System:
Orthorhombic
Class (H-M):
222 - Disphenoidal
Space Group:
P212121
Cell Parameters:
a = 8.2330(9) Å, b = 10.713(1) Å, c = 14.826(3) Å
Ratio:
a:b:c = 0.769 : 1 : 1.384
Unit Cell V:
1,307.66 ų (Calculated from Unit Cell)
Z:
4
Crystal Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
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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) |
|---|---|---|---|---|---|---|---|
| M11999 | Finescreekite | Kampf, Anthony R.; Smith, Jason B.; Hughes, John M.; Ma, Chi; Emproto, Christopher (2024) New Minerals from the Redmond Mine, North Carolina, USA: V. Finescreekite and Hayelasdiite, Two New Thiosulfate Minerals Containing Cubane-Like Pb4O4 Structural Units. The Canadian Journal of Mineralogy and Petrology, 62 (2). doi:10.3749/2300044 | 2024 | Redmond Mine, North Carolina, USA | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 6.00 Å | (78) |
| 3.846 Å | (48) |
| 3.701 Å | (62) |
| 3.436 Å | (85) |
| 3.007 Å | (100) |
| 2.644 Å | (82) |
| 2.045 Å | (43) |
| 1.780 Å | (43) |
Reference:
Kampf, Anthony R.; Smith, Jason B.; Hughes, John M.; Ma, Chi; Emproto, Christopher (2024) New Minerals from the Redmond Mine, North Carolina, USA: V. Finescreekite and Hayelasdiite, Two New Thiosulfate Minerals Containing Cubane-Like Pb4O4 Structural Units. The Canadian Journal of Mineralogy and Petrology, 62 (2). doi:10.3749/2300044
Type Occurrence of Finescreekite
General Appearance of Type Material:
colorless prisms and blades to about 0.5 mm in length
Place of Conservation of Type Material:
mineralogical collections of the Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA, catalogue number 76227
Geological Setting of Type Material:
secondary assemblage that comprises a variety of rare Pb-Zn-Cu sulfates, thiosulfates, and carbonates.
Associated Minerals at Type Locality:
Reference:
Kampf, Anthony R.; Smith, Jason B.; Hughes, John M.; Ma, Chi; Emproto, Christopher (2024) New Minerals from the Redmond Mine, North Carolina, USA: V. Finescreekite and Hayelasdiite, Two New Thiosulfate Minerals Containing Cubane-Like Pb4O4 Structural Units. The Canadian Journal of Mineralogy and Petrology, 62 (2). doi:10.3749/2300044
Other Language Names for Finescreekite
Dutch:Finescreekiet
German:Finescreekit
Common Associates
Associations Based on Photo Data:
| 1 photo of Finescreekite associated with Muscovite | KAl2(AlSi3O10)(OH)2 |
| 1 photo of Finescreekite associated with Cubothioplumbite | [Pb4(OH)4]Pb(S2O3)3 |
Related Minerals - Strunz-mindat Grouping
| 7.JA. | Hayelasdiite | [Pb4O1.5(OH)2.5]2[Cu+5(S2O3)4(S2O2OH)2(H2O)] · 4H2O |
| 7.JA. | Boojumite | Pb8O4(OH)2(S2O3)3 |
| 7.JA. | Boevskite | Pb4(TeO3)2(SO4)(S2O3) |
| 7.JA. | Redmondite | [Pb8O2Zn(OH)6](S2O3)4 |
| 7.JA. | Hydroredmondite | [Pb8O2Zn(OH)6](S2O3)4 · 2H2O |
| 7.JA. | Dinilawiite | [Pb4OAl(OH)6]2(S2O3)2 · (S2O3)(H2O)5 |
| 7.JA. | Sulfatoredmondite | [Pb8O2Zn(OH)6](SO4)4 · 6H2O |
| 7.JA. | Cubothioplumbite | [Pb4(OH)4]Pb(S2O3)3 |
| 7.JA. | Hexathioplumbite | [Pb2+4(OH)4]Pb2+(S6+O3S2-)3 |
| 7.JA.05 | Sidpietersite | Pb2+4(S2O3)O2(OH)2 |
| 7.JA.10 | Steverustite | Pb2+5(OH)5[Cu+(S6+O3S2-)3](H2O)2 |
| 7.JA.15 | Fassinaite | Pb2(S2O3)(CO3) |
| 7.JA.20 | Northstarite | Pb6(Te4+O3)5(S6+O3S2-) |
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 Finescreekite
mindat.org URL:
https://www.mindat.org/min-56158.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Finescreekite
Reference List:
Miyawaki, Ritsuro, Hatert, Frédéric, Pasero, Marco, Mills, Stuart J. (2022) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) – Newsletter 68. European Journal of Mineralogy, 34 (5) 385-391 doi:10.5194/ejm-34-385-2022
Kampf, Anthony R.; Smith, Jason B.; Hughes, John M.; Ma, Chi; Emproto, Christopher (2024) New Minerals from the Redmond Mine, North Carolina, USA: V. Finescreekite and Hayelasdiite, Two New Thiosulfate Minerals Containing Cubane-Like Pb4O4 Structural Units. The Canadian Journal of Mineralogy and Petrology, 62 (2). doi:10.3749/2300044
Localities for Finescreekite
Showing 1 localities.
symbol to view information about a locality.
The 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).
All localities listed without proper references should be considered as questionable.
USA (TL) | |
| Miyawaki et al. (2022) |
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Redmond Mine, Waterville Lake, Haywood County, North Carolina, USA