Biagioniite
A valid IMA mineral species
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About Biagioniite
Cristian Biagioni
Formula:
Tl2SbS2
may also be given as [Tl]4[Sb2][S]4
Colour:
Black
Lustre:
Metallic
Hardness:
3
Specific Gravity:
6.192 (Calculated)
Crystal System:
Monoclinic
Name:
Named in honor of Dr. Cristian Biagioni (b. 28 April 1981, Lucca, Tuscany, Italy), Professor of Mineralogy at the Department of Earth Sciences of the University of Pisa, Italy. Dr. Biagioni co-authored descriptions for more than 50 new mineral species. His research focuses on the mineralogy of Tuscany and systematic mineralogy, with a particular attention paid to sulfosalts. He also contributed to the discovery of the thallium-rich nature of a series of ore deposits in northern Tuscany, with the description of some Tl sulfosalts.
Isostructural with:
The TlSb analogue of dervillite. Chemically similar to weissbergite, pierrotite, parapierrotite, 'stibioellisite', and few unnamed species; also comparable to drechslerite.
Found in a museum sample.
Crystal structure details:
- Tl adopts different coordinations, from quasi linear to quasi tetrahedral;
- Sb forms Sb-Sb pairs
Found in a museum sample.
Crystal structure details:
- Tl adopts different coordinations, from quasi linear to quasi tetrahedral;
- Sb forms Sb-Sb pairs
Unique Identifiers
Mindat ID:
54362
Long-form identifier:
mindat:1:1:54362:6
IMA Classification of Biagioniite
Approved
Approval year:
2019
First published:
2020
Classification of Biagioniite
2.LA.
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
L : Unclassified Sulfosalts
A : Without essential Pb
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
L : Unclassified Sulfosalts
A : Without essential 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 |
|---|---|---|
| Bgi | 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 Biagioniite
Metallic
Transparency:
Opaque
Colour:
Black
Streak:
Black
Hardness:
3 on Mohs scale
Comment:
Estimated with respect to surrounding calcite
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
6.192 g/cm3 (Calculated)
Comment:
Calculated based on empirical formula
Optical Data of Biagioniite
Anisotropism:
weak with blueish to light-blue
Bireflectance:
moderately bireflectant
Reflectivity:
| Wavelength | R1 (%) | R2 (%) |
|---|---|---|
| 471nm | 35.9% | 37.5% |
| 548nm | 34.7% | 36.2% |
| 586nm | 33.8% | 35.3% |
| 652nm | 31.5% | 33.7% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 37.5%.
R1 shown in black, R2 shown in red
Colour in reflected light:
Creamy
Internal Reflections:
None
Pleochroism:
Non-pleochroic
Chemistry of Biagioniite
Mindat Formula:
Tl2SbS2
may also be given as [Tl]4[Sb2][S]4
may also be given as [Tl]4[Sb2][S]4
Element Weights:
Elements listed:
Crystallography of Biagioniite
Crystal System:
Monoclinic
Class (H-M):
m - Domatic
Space Group:
Pb
Setting:
Pc
Cell Parameters:
a = 11.0895(9) Å, b = 14.3124(11) Å, c = 7.9352(6) Å
β = 96.230(8)°
β = 96.230(8)°
Ratio:
a:b:c = 0.775 : 1 : 0.554
Unit Cell V:
1252.02 ų
Z:
8
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.79 Å | (60) |
| 3.68 Å | (40) |
| 3.56 Å | (100) |
| 3.48 Å | (40) |
| 3.37 Å | (75) |
| 3.16 Å | (49) |
| 3.08 Å | (40) |
| 3.03 Å | (60) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-? alteration and/or metamorphism | |
| 33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) |
Type Occurrence of Biagioniite
General Appearance of Type Material:
anhedral crystals up to 65 μm (very rare)
Place of Conservation of Type Material:
mineralogical collections of the Museo di Storia Naturale, Università di Firenze, Via La Pira 4, I-50121, Florence, Italy, catalogue number 46582/G
Associated Minerals at Type Locality:
Synonyms of Biagioniite
Other Language Names for Biagioniite
Dutch:Biagioniiet
German:Biagioniit
Common Associates
Associations Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 2.LA. | Thunderbayite | TlAg3Au3Sb7S6 |
| 2.LA. | Auerbakhite | MnTl2As2S5 |
| 2.LA. | Ferrofettelite | [Ag6As2S7][Ag10FeAs2S8] |
| 2.LA. | Gladkovskyite | MnTlAs3S6 |
| 2.LA.10 | Dervillite | Ag2AsS2 |
| 2.LA.15 | Daomanite | CuPtAsS2 |
| 2.LA.20 | Vaughanite | TlHgSb4S7 |
| 2.LA.25 | Criddleite | TlAg2Au3Sb10S10 |
| 2.LA.30 | Fettelite | [Ag6As2S7][Ag10HgAs2S8] |
| 2.LA.35 | Chaméanite | (Cu,Fe)4As(Se,S)4 |
| 2.LA.40 | Arcubisite | Ag6CuBiS4 |
| 2.LA.45 | Mgriite | Cu3AsSe3 |
| 2.LA.50 | Benleonardite | [Ag6(Sb,As)2S6Te][Ag9Cu(S,Te)2Te2] |
| 2.LA.55 | Tsnigriite | Ag9SbTe3S3 |
| 2.LA.60 | Borovskite | Pd3SbTe4 |
| 2.LA.65 | Jonassonite | AuBi5S4 |
| 2.LA.65 | Nuwaite | Ni6GeS2 |
| 2.LA.65 | Butianite | Ni6SnS2 |
| 2.LA.70 | Raberite | Tl5Ag4As6SbS15 |
| 2.LA.75 | Spaltiite | Tl2Cu2As2S5 |
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 Biagioniite
mindat.org URL:
https://www.mindat.org/min-54362.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
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References for Biagioniite
Reference List:
Miyawaki, Ritsuro, Hatert, Frédéric, Pasero, Marco, Mills, Stuart J. (2020) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) - Newsletter 54. European Journal of Mineralogy, 32 (2) 275-283 doi:10.5194/ejm-32-275-2020
Localities for Biagioniite
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.
Canada (TL) | |
| Bindi et al. (2020) +1 other reference |
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Hemlo gold deposit, Bomby Township, Thunder Bay District, Ontario, Canada