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Hayelasdiite
A valid IMA mineral species
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About Hayelasdiite
Formula:
[Pb4O1.5(OH)2.5]2[Cu+5(S2O3)4(S2O2OH)2(H2O)] Β· 4H2O
Colour:
colorless
Lustre:
Sub-Adamantine, Vitreous
Hardness:
2½
Specific Gravity:
4.909 (Calculated)
Crystal System:
Triclinic
Name:
The name hayelasdiite is based on the Cherokee word hayelasdi meaning blade, in reference to the blade-like habit of the mineral. The Cherokee are an indigenous people that, prior to the 18th century, were concentrated in the region surrounding the Redmond mine. The Eastern Band of Cherokee Indians (EBCI) still own and occupy a reservation that is headquartered in the town of Cherokee, North Carolina, about 36 km SW of the Redmond mine.
Hayelasdiite has a unique structure consisting of copper thiosulfate ribbons with inter-ribbon cubane-like Pb4(OH)4 units. It is the first mineral species with a protonated thiosulfate group (a monohydroxothiosulphate). Chemically comparable to steverustite (another thiosulfate mineral).
Unique Identifiers
Mindat ID:
56155
Long-form identifier:
mindat:1:1:56155:2
Classification of Hayelasdiite
The cubane-like Pb4(OH)4 unit
The Pb4(OH)4 motif found in hayelasdiite. This structural unit is also found in, for example, hexathioplumbite and nitroplumbite. Hayelasdiite is interpreted to have a slightly modified version that is less hydroxylated for charge balance.
IMA Classification of Hayelasdiite
Approved
IMA Formula:
[Pb2+4O1.5(OH)2.5]2[Cu1+5(S6+O3S2-)4(S6+O3S2-H)2(H2O)]Β·4H2O
Approval history:
IMA no. 2022-021
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 IMAβCNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Hyl | IMAβCNMNC | Warr, L.N. (2021). IMAβCNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Hayelasdiite
Sub-Adamantine, Vitreous
Colour:
Colorless
Streak:
White
Hardness:
2½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
{010}
{010}
Fracture:
Step-Like
Density:
4.909 g/cm3 (Calculated)
Optical Data of Hayelasdiite
Type:
Biaxial (-)
RI values:
nα = 1.89(1) nβ = 1.95 nγ = 1.97
2V:
Measured: 58° (5)
Max. Birefringence:
δ = 0.080
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 Β΅m 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 Β΅m 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:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Comments:
Ξ² = 1.95(calc), Ξ³ = 1.97(calc)
Chemistry of Hayelasdiite
Mindat Formula:
[Pb4O1.5(OH)2.5]2[Cu+5(S2O3)4(S2O2OH)2(H2O)] Β· 4H2O
Element Weights:
Crystallography of Hayelasdiite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 7.5209(1) Å, b = 14.9345(3) Å, c = 17.898(1) Å
α = 106.727(8)°, β = 90.966(6)°, γ = 90.031(6)°
α = 106.727(8)°, β = 90.966(6)°, γ = 90.031(6)°
Ratio:
a:b:c = 0.504 : 1 : 1.198
Unit Cell V:
1,924.95 Γ
Β³ (Calculated from Unit Cell)
Z:
2
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
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Perspective On | Perspective Off
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View
CIF File Best | x | y | z | a | b | c
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Rotation
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Labels
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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) |
|---|---|---|---|---|---|---|---|
| M11984 | Hayelasdiite | Kampf, A.R.; Smith, J.B.; Hughes, J.M.; Ma, C.; Emproto, C. (2024) Hayelasdiite Kampf, Anthony R.; Smith, Jason B.; Hughes, John M.; Ma, Chi; Emproto, Christopher New Minerals from the Redmond Mine, North Carolina, USA: V. Finescreekite and Hayelasdiite, Two New Thiosulfate Minerals Containing Cubane-Like Pb4O4 Structural Unit | 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 |
|---|---|
| 14.38 Γ | (84) |
| 6.88 Γ | (72) |
| 3.797 Γ | (54) |
| 3.331 Γ | (100) |
| 3.243 Γ | (55) |
| 3.006 Γ | (73) |
| 2.941 Γ | (72) |
| 2.868 Γ | (58) |
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 Hayelasdiite
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 76219
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
Redmond Mine, Waterville Lake, Haywood County, North Carolina, USA