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Marcobaldiite

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Formula:
Pb12(Sb3As2Bi)Σ6S21
Colour:
Black
Lustre:
Metallic
Hardness:
3 - 3½
Specific Gravity:
6.56 (Calculated)
Crystal System:
Triclinic
Name:
Named in honour of the amateur mineralogist Marco Baldi (b. 1944) for his contribution to the knowledge of the mineralogy of the pyrite ± baryte ± iron oxide ore deposits from southern Apuan Alps.
A N = 3.5 homologue of the jordanite homologous series, characterized by the 1:1 alternation of two kinds of layers of distorted octahedra, three- and four-octahedra thick, i.e. of the kirkiite and jordanite types, respectively. Layers are connected by one atomic layer of three bicapped trigonal prismatic Pb atoms and one triangular pyramidal As atom in split position (Biagioni et al. 2018).

Seems to be the Sb3As2Bi analogue of arsenmarcobaldiite. Likely unique as a sulphosalt with Sb, As and Bi being all required.

Discovered from a single specimen (Biagioni et al. 2018).



Hide all sections | Show all sections

Classification of MarcobaldiiteHide

Approved
Approval Year:
2016
First Published:
2018

Physical Properties of MarcobaldiiteHide

Metallic
Transparency:
Opaque
Colour:
Black
Streak:
Black
Hardness:
3 - 3½ on Mohs scale
Hardness:
VHN15=170 - 195 kg/mm2 - Vickers
Tenacity:
Brittle
Fracture:
Irregular/Uneven
Density:
6.56 g/cm3 (Calculated)

Optical Data of MarcobaldiiteHide

Type:
Anisotropic
Anisotropism:
Distinct with grey to bluish-grey rotation tints
Bireflectance:
Distinct
Reflectivity:
470nmR1=31.6%R2= 40.1%
546nmR1=30.9%R2= 39.6%
589nmR1=30.4%R2= 38.5%
650nmR1=30.0%R2= 37.6%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 40.1%.
R1 shown in black, R2 shown in red
Colour in reflected light:
White under the ore microscope
Internal Reflections:
Not observed

Chemical Properties of MarcobaldiiteHide

Formula:
Pb12(Sb3As2Bi)Σ6S21
IMA Formula:
Pb12(Sb3As2Bi)Σ6S21

Crystallography of MarcobaldiiteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pedial
Space Group:
P1
Cell Parameters:
a = 8.9248(9) Å, b = 29.414(3) Å, c = 8.5301(8) Å
α = 98.336(5)°, β = 118.175(5)°, γ = 90.856(5)°
Ratio:
a:b:c = 0.303 : 1 : 0.29
Unit Cell V:
1944.1 ų
Z:
2
Twinning:
Polysynthetic lamellar twinning is common.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.568 Å(ms)
3.202 Å(ms)
3.016 Å(ms)
2.885 Å(ms)
2.233 Å(vs)
2.125 Å(s)
1.848 Å(s)
1.775 Å(vs)

Type Occurrence of MarcobaldiiteHide

General Appearance of Type Material:
A black blocky prismatic crystal (up to 1 cm in size).
Place of Conservation of Type Material:
collections of the Museo di Storia Naturale, Università di Pisa, Via Roma 79, Calci (Pisa), Italy (catalogue number 19709)
Empirical Formula of Type Material:
Pb11.98(4)Sb2.90(3)As2.33(3)Bi0.79(1)S20.80(20)
Chemical Analysis of Type Material:
Pb64.05 %
As4.51 %
Sb9.10 %
Bi4.24 %
S17.24 %
Total:99.14 %
Geological Setting of Type Material:
A quartz vein embedded in tourmaline-bearing schist
Associated Minerals at Type Locality:
Reference:
Biagioni, C., Pasero, M., Moëlo, Y., Zaccarini, F., Paar, W.H. (2018) Lead-antimony sulfosalts from Tuscany (Italy). XXII. Marcobaldiite, ∼Pb12(Sb3As2Bi)Σ6S21, a new member of the jordanite homologous series from the Pollone mine, Valdicastello Carducci. European Journal of Mineralogy, 30: 581-592

Synonyms of MarcobaldiiteHide

Relationship of Marcobaldiite to other SpeciesHide

Other Members of this group:
ArsenmarcobaldiitePb12(As3.2Sb2.8)Σ6S21Tric. 1 : P1
GeocronitePb14(Sb,As)6S23Mon. 2/m : P21/m
GratonitePb9As4S15Trig. 3m : R3m
JordanitePb14(As,Sb)6S23Mon. 2/m : P21/m
KirkiitePb10Bi3As3S19Mon. 2/m : P21/m

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for MarcobaldiiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Biagioni, C., Pasero, M., Moëlo, Y., Zaccarini, F., Paar, W.H., Merlino, S. (2016): Marcobaldiite, IMA No. 2015-109. CNMNC Newsletter No. 30, April 2016, page 410; Mineralogical Magazine: 80: 407–413
Biagioni, C., Pasero, M., Moëlo, Y., Zaccarini, F., Paar, W.H. (2018) Lead-antimony sulfosalts from Tuscany (Italy). XXII. Marcobaldiite, ∼Pb12(Sb3As2Bi)Σ6S21, a new member of the jordanite homologous series from the Pollone mine, Valdicastello Carducci. European Journal of Mineralogy, 30: 581-592.

Internet Links for MarcobaldiiteHide

Localities for MarcobaldiiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Italy (TL)
 
  • Tuscany
    • Lucca Province
      • Pietrasanta
        • Valdicastello Carducci
          • Pollone Mine
Biagioni, C., Pasero, M., Moëlo, Y., Zaccarini, F., Paar, W.H. and Merlino, S. (2016) Marcobaldiite, IMA 2015-109. CNMNC Newsletter No. 30, April 2016, page 410; Mineralogical Magazine: 80: 407–413.; Biagioni, C., Pasero, M., Moëlo, Y., Zaccarini, F., Paar, W.H. (2018) Lead-antimony sulfosalts from Tuscany (Italy). XXII. Marcobaldiite, ∼Pb12(Sb3As2Bi)Σ6S21, a new member of the jordanite homologous series from the Pollone mine, Valdicastello Carducci. European Journal of Mineralogy, 30: 581-592.
 
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