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.

Type Locality:

ⓘ Stanzone tunnel, Pollone Mine, Valdicastello Carducci, Pietrasanta, Lucca Province, Tuscany, Italy

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).

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Unique IdentifiersHide

Mindat ID:

47600

Long-form identifier:

mindat:1:1:47600:5

GUID
(UUID V4):

f9c7cd67-1847-4b5c-b6dc-9357f0d69ce8

IMA Classification of MarcobaldiiteHide

IMA status:

Approved

IMA Formula:

Pb₁₂(Sb₃As₂Bi)_Σ6S₂₁

Approval year:

2016

First published:

2018

Type description reference:

Biagioni, Cristian, Pasero, Marco, Moëlo, Yves, Zaccarini, Federica, Paar, Werner 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 (3) 581-592 doi:10.1127/ejm/2018/0030-2710

Classification of MarcobaldiiteHide

Strunz-mindat (2024):

2.JB.30a

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
J : Sulfosalts of PbS archetype
B : Galena derivatives, with Pb

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Symbol	Source	Reference
Mcb	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 MarcobaldiiteHide

Lustre:

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

Anisotropism:

Distinct with grey to bluish-grey rotation tints

Bireflectance:

Distinct

Reflectivity:

Wavelength	R₁	R₂
470nm	31.6%	40.1%
546nm	30.9%	39.6%
589nm	30.4%	38.5%
650nm	30.0%	37.6%

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

Chemistry of MarcobaldiiteHide

Mindat Formula:

Pb₁₂(Sb₃As₂Bi)_Σ6S₂₁

Elements listed:

As, Bi, Pb, S, Sb - search for minerals with similar chemistry

Crystallography of MarcobaldiiteHide

Crystal System:

Triclinic

Class (H-M):

1 - Pedial

Space Group:

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 Å³

Twinning:

Polysynthetic lamellar twinning is common.

X-Ray Powder DiffractionHide

Powder Diffraction Data:

d-spacing	Intensity
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)

Geological EnvironmentHide

Paragenetic Mode(s):

Paragenetic Mode	Earliest Age (Ga)
Stage 3b: Earth’s earliest hydrosphere	>4.45
12 : Hadean hydrothermal subsurface sulfide deposits (see also #33)

Type Occurrence of MarcobaldiiteHide

Type Locality:

ⓘ Stanzone tunnel, Pollone Mine, Valdicastello Carducci, Pietrasanta, Lucca Province, Tuscany, Italy

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:

Pb_11.98(4)Sb_2.90(3)As_2.33(3)Bi_0.79(1)S_20.80(20)

Chemical Analysis of Type Material:

Pb	64.05 %
As	4.51 %
Sb	9.10 %
Bi	4.24 %
S	17.24 %
Total:	99.14 %

Geological Setting of Type Material:

A quartz vein embedded in tourmaline-bearing schist .

Associated Minerals at Type Locality:

Tennantite Subgroup

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

Download:

https://rruff.info/rruff_1.0/uploads/EJM30_581.pdf

Synonyms of MarcobaldiiteHide

IMA2015-109

Relationship of Marcobaldiite to other SpeciesHide

Member of:

Jordanite Homologous Series Group

Other Members of this group:

Arsenmarcobaldiite	Pb₁₂(As_3.2Sb_2.8)_Σ6S₂₁	Tric. 1 : P1
Geocronite	Pb₁₄Sb₆S₂₃	Mon. 2/m : P2₁/m
Gratonite	Pb₉As₄S₁₅	Trig. 3m : R3m
Jordanite	Pb₁₄As₆S₂₃	Mon. 2/m : P2₁/m
Kirkiite	Pb₁₀Bi₃As₃S₁₉	Mon. 2/m : P2₁/m

Related Minerals - Strunz-mindat Grouping Hide

2.JB.	Senandorite	AgPbSb₃S₆	Orth. mm2 : Pmn2₁
2.JB.	Oscarkempffite	Ag₁₀Pb₄(Sb₁₇Bi₉)S₄₈	Orth. mm2
2.JB.	Chukotkaite	AgPb₇Sb₅S₁₅	Mon. 2/m : P2₁/b
2.JB.	Arsenquatrandorite	Ag_17.6Pb_12.8Sb_38.1As_11.5S₉₆	Mon. 2/m : P2₁/b
2.JB.	Clino-oscarkempffite	Ag₁₅Pb₆Sb₂₁Bi₁₈S₇₂	Mon. 2/m : P2₁/b
2.JB.	Andreadiniite	CuHgAg₇Pb₇Sb₂₄S₄₈	Mon. 2/m : P2₁/b
2.JB.	Ginelfite	Ag₂(Ag_0.5Fe)TlPb_23.5(Sb,As)_33.5S₇₆	Tric. 1 : P1
2.JB.	Lazerckerite	Ag_3.75Pb_4.50(Sb_7.75Bi₄)S₂₄	Mon. 2/m
2.JB.	Lasmanisite	Ag₁₂Pb₁₃Mn₁₁Sb₄₄S₉₆	Orth. 2 2 2 : P2₁ 2₁ 2₁
2.JB.	Montpelvouxite	AgPb₁₆Sb₂₇As₁₈S₈₄	Tric. 1 : P1
2.JB.	Selenojunoite	Cu₂Pb₃Bi₈Se₁₆	Mon. 2/m : B2/m
2.JB.05	Diaphorite	Ag₃Pb₂Sb₃S₈	Mon. 2/m : P2₁/b
2.JB.10	Cosalite	Pb₂Bi₂S₅	Orth. mmm (2/m 2/m 2/m)
2.JB.15	Freieslebenite	AgPbSbS₃	Mon. 2/m : P2₁/b
2.JB.15	Marrite	AgPbAsS₃	Mon. 2/m : P2₁/b
2.JB.20	Cannizzarite	Pb₄₈Bi₅₆S₁₃₂	Mon. 2/m : P2₁/m
2.JB.20	Wittite	Pb₉Bi₁₂(S,Se)₂₇	Mon.
2.JB.25a	Junoite	Cu₂Pb₃Bi₈(S,Se)₁₆	Mon. 2/m : B2/m
2.JB.25i	Neyite	Ag₂Cu₆Pb₂₅Bi₂₆S₆₈	Mon. 2/m : B2/m
2.JB.25c	Nordströmite	CuPb₃Bi₇(Se₄S₁₀)	Mon. 2/m : P2₁/m
2.JB.25g	Nuffieldite	Cu_1.4Pb_2.4Bi_2.4Sb_0.2S₇	Orth. mmm (2/m 2/m 2/m)
2.JB.25d	Proudite	CuPb_7.5Bi_9.33(S,Se)₂₂	Mon. 2/m : B2/m
2.JB.25h	Weibullite	Pb₅Bi₈Se₇S₁₁	Orth. mmm (2/m 2/m 2/m) : Pnma
2.JB.25b	Felbertalite	Cu₂Pb₆Bi₈S₁₉	Mon. 2/m : B2/m
2.JB.25j	Rouxelite	Cu₂HgPb₂₃Sb₂₇S_65.5	Mon. 2/m : B2/m
2.JB.25f	Ángelaite	Cu₂AgPbBiS₄	Orth. mmm (2/m 2/m 2/m) : Pnma
2.JB.25i	Cuproneyite	Cu₇Pb₂₇Bi₂₅S₆₈	Mon. 2/m : B2/m
2.JB.30a	Geocronite	Pb₁₄Sb₆S₂₃	Mon. 2/m : P2₁/m
2.JB.30a	Jordanite	Pb₁₄As₆S₂₃	Mon. 2/m : P2₁/m
2.JB.30b	Kirkiite	Pb₁₀Bi₃As₃S₁₉	Mon. 2/m : P2₁/m
2.JB.30c	Tsugaruite	Pb₂₈As₁₅S₅₀Cl	Orth. mm2 : Pnn2
2.JB.30a	Arsenmarcobaldiite	Pb₁₂(As_3.2Sb_2.8)_Σ6S₂₁	Tric. 1 : P1
2.JB.35c	Pillaite	Pb₉Sb₁₀S₂₃ClO_0.5	Mon. 2/m : B2/m
2.JB.35a	Zinkenite	Pb₉Sb₂₂S₄₂	Hex. 6 : P6₃
2.JB.35b	Scainiite	Pb₁₄Sb₃₀S₅₄O₅	Mon. 2/m : B2/m
2.JB.35d	Pellouxite	(Cu,Ag)Pb₁₀Sb₁₂S₂₇O(Cl,S)_0.6	Mon. 2/m : B2/m
2.JB.35f	Tubulite	Ag₂Pb₂₂Sb₂₀S₅₃	Mon. m : Pb
2.JB.35e	Chovanite	Pb_15-2xSb_14+2xS₃₆O_x (x ~ 0.2)	Mon. 2/m : B2/m
2.JB.40b	Aschamalmite	Pb_6-3xBi_2+xS₉	Mon. 2/m : B2/m
2.JB.40a	Bursaite	Pb₅Bi₄S₁₁ (?)	Orth.
2.JB.40b	Eskimoite	Ag₇Pb₁₀Bi₁₅S₃₆	Mon.
2.JB.40a	Fizélyite	Ag₅Pb₁₄Sb₂₁S₄₈	Mon. 2/m
2.JB.40a	Gustavite	AgPbBi₃S₆	Orth. mmm (2/m 2/m 2/m)
2.JB.40a	Lillianite	Pb_3-2xAg_xBi_2+xS₆	Orth. mmm (2/m 2/m 2/m)
2.JB.40c	Ourayite	Ag₃Pb₄Bi₅S₁₃	Orth.
2.JB.40a	Ramdohrite	Pb_5.9Fe_0.1Mn_0.1In_0.1Cd_0.2Ag_2.8Sb_10.8S₂₄	Mon. 2/m
2.JB.40a	Roshchinite	Ag₁₉Pb₁₀Sb₅₁S₉₆	Orth. mmm (2/m 2/m 2/m) : Pnma
2.JB.40d	Schirmerite	PbAgBi₃S₆ - Pb₃Ag_1.5Bi_3.5S₉	Orth.
2.JB.40a	Treasurite	Ag₇Pb₆Bi₁₅S₃₂	Mon.
2.JB.40a	Uchucchacuaite	AgMnPb₃Sb₅S₁₂	Orth. mmm (2/m 2/m 2/m) : Pmmm
2.JB.40e	Ustarasite	Pb(Bi,Sb)₆S₁₀ (?)
2.JB.40a	Vikingite	Ag₅Pb₈Bi₁₃S₃₀	Mon. 2/m : B2/m
2.JB.40a	Xilingolite	Pb₃Bi₂S₆	Mon.
2.JB.40b	Heyrovskýite	Pb₆Bi₂S₉	Orth. mmm (2/m 2/m 2/m) : Cccm
2.JB.40	UM1988-05-S:AgBiCuHgPb	(Hg,Ag,Cu,Pb)₅Pb₅Bi₁₁S₂₇
2.JB.40	UM1988-06-S:AgBiCuHgPb	(Pb,Hg)₁₂(Cu,Ag)₃(Bi,Sb)₁₀(S,Te)₂₇
2.JB.40a	Quatrandorite	AgPbSb₃S₆	Mon. 2/m : P2₁/b
2.JB.40a	Menchettiite	AgPb_2.40Mn_1.60Sb₃As₂S₁₂	Mon. 2/m : P2₁/b
2.JB.40a	Terrywallaceite	AgPb(Sb,Bi)₃S₆	Mon. 2/m : P2₁/b
2.JB.40a	Jasrouxite	Ag₁₆Pb₄(Sb₂₄As₁₆)S₇₂	Tric. 1 : P1
2.JB.40a	Erzwiesite	Ag₈Pb₁₂Bi₁₆S₄₀	Orth. mmm (2/m 2/m 2/m) : Cmcm
2.JB.40a	Staročeskéite	Ag_0.70Pb_1.60(Bi_1.35Sb_1.35)_Σ2.70S₆	Orth. mmm (2/m 2/m 2/m) : Cmcm
2.JB.40a	Oyonite	Ag₃Mn₂Pb₄Sb₇As₄S₂₄	Mon. 2/m
2.JB.40a	Holubite	Ag₃Pb₆(Sb₈Bi₃)S₂₄	Mon. 2/m
2.JB.40b	Baiamareite	Ag4Pb12Fe4Sb20S48	Mon. 2/m
2.JB.55	Gratonite	Pb₉As₄S₁₅	Trig. 3m : R3m
2.JB.60	Marrucciite	Hg₃Pb₁₆Sb₁₈S₄₆	Mon. 2/m : B2/m
2.JB.65	Vurroite	Pb₂₀Sn₂(Bi,As)₂₂S₅₄Cl₆	Mon. 2/m : B2/b
2.JB.65	Tazieffite	Pb₂₀Cd₂(As,Bi)₂₂S₅₀Cl₁₀	Mon. 2/m : B2/b
2.JB.70	Daliranite	PbHgAs₂S₅	Mon.

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.

Internet Links for MarcobaldiiteHide

mindat.org URL:

https://www.mindat.org/min-47600.html
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Raman and XRD data at RRUFF project

References and PDF downloads at RRUFF project

American Mineralogist Crystal Structure Database

Handbook of Mineralogy page PDF

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References for MarcobaldiiteHide

Reference List:

Hålenius, U., Hatert, F., Pasero, M., Mills, S.J. (2016) New minerals and nomenclature modifications approved in 2016, CNMNC Newsletter no 30. Mineralogical Magazine, 80 (2) 407-413 doi:10.1180/minmag.2016.080.081

(2023) Marcobaldiite. Handbook of Mineralogy. Mineralogical Society of America

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 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). ~~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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.


Italy (TL)
Tuscany Lucca Province Pietrasanta Valdicastello Carducci Pollone Mine ⓘ Stanzone tunnel (TL)	Hålenius et al. (2016) +2 other references

Japan
Okinawa Prefecture Shimajiri District Kumejima Daisan-Kume Knoll ⓘ ANA Hydrothermal Field	Torimoto et al. (2018)

Marcobaldiite