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Sigogglinite
A valid IMA mineral species
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About Sigogglinite
Formula:
[Pb6Zn(OH)8]2(SO4)6 · (H2O)8-x
0 ≤ x ≤ 1
Colour:
colourless
Lustre:
Vitreous, Waxy
Hardness:
3
Specific Gravity:
5.085 - 5.107
Crystal System:
Monoclinic
Name:
For the Appalachian English slang term “sigogglin”, which has a general meaning along the lines of tilted, skewed, winding, ‘not right’, or not built correctly. This is a reference to several aspects of the mineral’s appearance and crystal structure.
A very rare Pb-Zn sulfate mineral with cubane-like structural units topologically related to those of redmondite, hydroredmondite, and sulfatoredmondite.
Two polytypoids are known: sigogglinite-P2/n (7 H2O per formula unit) and sigogglinite-P21/c (8 H2O per formula unit).
Two polytypoids are known: sigogglinite-P2/n (7 H2O per formula unit) and sigogglinite-P21/c (8 H2O per formula unit).
Unique Identifiers
Mindat ID:
471929
Long-form identifier:
mindat:1:1:471929:4
IMA Classification of Sigogglinite
Approved
IMA Formula:
[Pb2+6Zn2+(OH)8](S6+O4)3·3H2O
Approval year:
2024
Approval history:
IMA2024-069
Classification of Sigogglinite
7.DF.
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
F : With large and medium-sized cations
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
F : With large and medium-sized cations
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 |
|---|---|---|
| Sgog | 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 Sigogglinite
Vitreous, Waxy
Transparency:
Transparent
Colour:
Colourless
Streak:
White
Hardness:
3 on Mohs scale
Hardness Data:
Measured
Comment:
Based on scratch tests
Tenacity:
Brittle
Cleavage:
Distinct/Good
Good on {100} (P2/n); equivalent to {001} in P21/c polytypoid.
Good on {100} (P2/n); equivalent to {001} in P21/c polytypoid.
Fracture:
Irregular/Uneven
Density:
5.085 - 5.107 g/cm3 (Measured)
Comment:
Calculated. Lower density is for P2/n, higher density is for P2(1)/c.
Optical Data of Sigogglinite
Type:
Biaxial (-)
RI values:
nα = 1.754(3) nβ = 1.768(3) nγ = 1.772(3)
2V:
Measured: 50.9° (4)
Max. Birefringence:
δ = 0.018
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:
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.
Dispersion:
r > v weak
Orientation:
Z = b, Y ^ c = 28° in obtuse angle β
Pleochroism:
Non-pleochroic
Chemistry of Sigogglinite
Mindat Formula:
[Pb6Zn(OH)8]2(SO4)6 · (H2O)8-x
0 ≤ x ≤ 1
0 ≤ x ≤ 1
Element Weights:
Crystallography of Sigogglinite
Polytype:
Formula:
Crystal System:
Class (H-M)
Space Group:
Space Group Setting:
Cell Parameters:
Ratio:
Unit Cell Volume (calc):
Z:
Comment:
| Sigogglinite-P2(1)/c | Sigogglinite-P2/n |
|---|---|
| [Pb6Zn(OH)8]2(SO4)6 · (H2O)8 | [Pb6Zn(OH)8]2(SO4)6 · (H2O)7 |
| Monoclinic | Monoclinic |
| 2/m - Prismatic | 2/m - Prismatic |
| P21/c | P2/c |
| P21/c | P2/m |
| a = 9.0243(2) Å, b = 17.6454(3) Å, c = 14.8646(3) Å β = 95.166(1)° | a = 14.8109(2) Å, b = 9.1360(1) Å, c = 17.3693(3) Å β = 92.879(1)° |
| a:b:c = 0.511 : 1 : 0.842 | a:b:c = 1.621 : 1 : 1.901 |
| V 2357.39 ų | V 2347.31 ų |
| 2 | 2 |
| P2/n |
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.349 Å | (76) |
| 5.854 Å | (100) |
| 3.800 Å | (82) |
| 3.535 Å | (83) |
| 2.946 Å | (67) |
| 2.907 Å | (54) |
| 2.781 Å | (58) |
| 2.580 Å | (56) |
Type Occurrence of Sigogglinite
General Appearance of Type Material:
Stout six-sided tablets with diagonal striations (P2/n polytype) or as a lone reticulated lathe-like crystal (P2(1)/c polytype)
Place of Conservation of Type Material:
Type material is deposited in the collections of the Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA, catalogue number 76449
Geological Setting of Type Material:
Supergene zone of a small lead-zinc vein hosted within metamorphic rocks.
Synonyms of Sigogglinite
Other Language Names for Sigogglinite
Dutch:Sigoggliniet
German:Sigogglinit
Related Minerals - Strunz-mindat Grouping
| 7.DF. | Siligiite | [Pb(H2O)5(SO4)][Zn9(OH)18] |
| 7.DF. | Alcaparrosaite | K3Ti4+Fe3+(SO4)4O(H2O)2 |
| 7.DF. | Flaggite | Pb4Cu2+4Te6+2(SO4)2O11(OH)2(H2O) |
| 7.DF. | Bairdite | Pb2Cu2+4Te6+2O10(OH)2(SO4) · H2O |
| 7.DF. | Tzeferisite | CaZn8(SO4)2(OH)12Cl2(H2O)9 |
| 7.DF. | Cherokeeite | [Pb2Zn(OH)4](SO4) · H2O |
| 7.DF. | Ammoniomathesiusite | (NH4)5(UO2)4(SO4)4(VO5) · 4H2O |
| 7.DF.X | Blueridgeite | [Pb8Zn3Cu2+(OH)16](SO4)2(S2O3)2 · 2H2O |
| 7.DF. | Erssonite | Mg7Fe3+2(OH)18[Ca(H2O)6](SO4)2 · 12H2O |
| 7.DF. | Poellmannite | Ca6Al3(OH)18[Na(H2O)6](SO4)2 · 6H2O |
| 7.DF. | Carlsonite | (NH4)5Fe3+3O(SO4)6 · 7H2O |
| 7.DF. | Cuprocherokeeite | [Pb8Zn3Cu2+(OH)16](SO4)4 · 4H2O |
| 7.DF. | Haywoodite | [Pb(H2O)10][Zn12(OH)20(H2O)(SO4)3] |
| 7.DF. | Chromschieffelinite | Pb10Te6+6O20(OH)14(CrO4)(H2O)5 |
| 7.DF.05 | Uklonskovite | NaMg(SO4)F · 2H2O |
| 7.DF.10 | Kainite | KMg(SO4)Cl · 3H2O |
| 7.DF.10 | Kaliochalcite | KCu2(SO4)2[(OH)(H2O)] |
| 7.DF.15 | Natrochalcite | NaCu2(SO4)2(OH) · 2H2O |
| 7.DF.17 | Genplesite | Ca3Sn(SO4)2(OH)6 · 3H2O |
| 7.DF.17 | 'Unnamed (Ba-Sb Silicate-Sulphate-Hydroxide-Hydrate)' | Ba3Sb5+[(Si,S)O3(OH)]2(OH,O)6 · 3H2O |
| 7.DF.20 | Sideronatrite | Na2Fe(SO4)2(OH) · 3H2O |
| 7.DF.20 | Metasideronatrite | Na2Fe(SO4)2(OH) · H2O |
| 7.DF.25 | Fleischerite | Pb3Ge(SO4)2(OH)6 · 3H2O |
| 7.DF.25 | Mallestigite | Pb3Sb5+(SO4)(AsO4)(OH)6 · 3H2O |
| 7.DF.25 | Schaurteite | Ca3Ge(SO4)2(OH)6 · 4H2O |
| 7.DF.25 | Despujolsite | Ca3Mn4+(SO4)2(OH)6 · 3H2O |
| 7.DF.30 | Slavíkite | (H3O+)3Mg6Fe15(SO4)21(OH)18 · 98H2O |
| 7.DF.35 | Metavoltine | K2Na6Fe2+Fe3+6O2(SO4)12 · 18H2O |
| 7.DF.40 | Lannonite | Mg2Ca4Al4(SO4)8F8 · 24H2O |
| 7.DF.40 | Vlodavetsite | AlCa2(SO4)2F2Cl · 4H2O |
| 7.DF.45 | Peretaite | Ca(SbO)4(SO4)2(OH)2 · 2H2O |
| 7.DF.50 | Gordaite | NaZn4(SO4)(OH)6Cl · 6H2O |
| 7.DF.50 | Calamaite | Na2TiO(SO4)2 · 2H2O |
| 7.DF.52 | Huizingite-(Al) | [(NH4)9(SO4)2][(Al,Fe3+)3(OH)2(H2O)4(SO4)6] |
| 7.DF.52 | Scordariite | K8(Fe3+0.67◻0.33)[Fe3+3O(SO4)6]2 · 14H2O |
| 7.DF.55 | Clairite | (NH4)2Fe3(SO4)4(OH)3 · 3H2O |
| 7.DF.55 | Giacovazzoite | K5Fe3+3O(SO4)6 · 10H2O |
| 7.DF.57 | Magnanelliite | K3Fe3+2(SO4)4(OH)(H2O)2 |
| 7.DF.60 | Arzrunite | Cu4Pb2(SO4)(OH)4Cl6 · 2H2O (?) |
| 7.DF.60 | Evdokimovite | Tl4(VO)3(SO4)5(H2O)5 |
| 7.DF.62 | Bridgesite-(Ce) | CaCe2Cu6(SO4)4(OH)12 · 8H2O |
| 7.DF.65 | Elyite | Pb4Cu(SO4)O2(OH)4 · H2O |
| 7.DF.70 | Yecoraite | Fe3+3Bi5(Te6+O4)2(Te4+O3)O9 · 9H2O |
| 7.DF.70 | Lautenthalite | PbCu4(SO4)2(OH)6 · 3H2O |
| 7.DF.75 | Riomarinaite | Bi(SO4)(OH) · H2O |
| 7.DF.80 | Dukeite | Bi3+24Cr6+8O57(OH)6 · 3H2O |
Fluorescence of Sigogglinite
Non-fluorescent
Other Information
Magnetism:
Non-Magnetic
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 Sigogglinite
mindat.org URL:
https://www.mindat.org/min-471929.html
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References for Sigogglinite
Reference List:
Bosi, Ferdinando; Hatert, Frédéric; Pasero, Marco; Mills, Stuart J. (2025) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) – Newsletter 84. European Journal of Mineralogy, 37 (2). 249-255 doi:10.5194/ejm-37-249-2025
Emproto, Christopher; Olds, Travis A.; Kampf, Anthony R.; Smith, Jason B.; Ma, Chi; Hughes, John M. (2026) New Minerals from the Redmond Mine, North Carolina, USA: XI. Sigogglinite, a New Sulfate with the Novel Pb6Zn(OH)8 Dimer. The Canadian Journal of Mineralogy and Petrology, 64 (3). p.261-274. doi:10.3749/2500024
Localities for Sigogglinite
Showing 3 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) | |
| [Sigogglinite-P2(1)/c, Sigogglinite-P2/n] Bosi et al. (2025) |
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Redmond Mine, Waterville Lake, Haywood County, North Carolina, USA