Lombardoite
A valid IMA mineral species
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About Lombardoite
Bruno Lombardo
Formula:
Ba2Mn3+(AsO4)2(OH)
Colour:
Dark red–brown
Lustre:
Vitreous
Hardness:
6 - 6½
Specific Gravity:
5.124 (Calculated)
Crystal System:
Monoclinic
Member of:
Name:
Named in honor of Bruno Lombardo (15 December 1944, Cuneo, Italy – January 2014), geologist and petrologist at C.N.R. (National Research Council of Italy). He contributed extensively to the understanding of the evolution of orogenic belts worldwide.
The As (or arsenate) analogue of tokyoite. The Ba analogue of aldomarinoite. Two polytypes are known, one monoclinic (P21/m), one triclinic (P-1).
Compare 'Unnamed (Possible Ordered As-analogue of Tokyoite)'.
Compare 'Unnamed (Possible Ordered As-analogue of Tokyoite)'.
Unique Identifiers
Mindat ID:
50252
Long-form identifier:
mindat:1:1:50252:2
GUID
(UUID V4):
(UUID V4):
a402e238-e88e-4b6f-8925-2374dbd0cbbf
IMA Classification of Lombardoite
Classification of Lombardoite
8.BG.05
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
G : With medium-sized and large cations, (OH, etc.):RO4 = 0.5:1
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
G : With medium-sized and large cations, (OH, etc.):RO4 = 0.5:1
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 |
|---|---|---|
| Lmb | 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 Lombardoite
Vitreous
Transparency:
Transparent
Colour:
Dark red–brown
Streak:
Yellow–orange
Hardness:
6 - 6½ on Mohs scale
Hardness Data:
Estimated
Comment:
Estimated by analogy to canosioite.
Tenacity:
Brittle
Cleavage:
None Observed
Parting:
None Observed
Density:
5.124 g/cm3 (Calculated)
Comment:
Could not measured due to the small crystal size and the frequent micro inclusions of other phases.
Optical Data of Lombardoite
Type:
Biaxial (+)
Pleochroism:
Visible
Comments:
X = yellowish brown; Y = brown; Z = reddish brown.
Comments:
Absorption: Z > Y > X.
The mean refractive index obtained from the Gladstone–Dale relationship, the empirical formula and the calculated density is 1.86.
The mean refractive index obtained from the Gladstone–Dale relationship, the empirical formula and the calculated density is 1.86.
Chemistry of Lombardoite
Mindat Formula:
Ba2Mn3+(AsO4)2(OH)
Crystallography of Lombardoite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Setting:
P21/m
Cell Parameters:
a = 7.8636(1) Å, b = 6.13421(8) Å, c = 9.1197(1) Å
β = 112.660(2)°
β = 112.660(2)°
Ratio:
a:b:c = 1.282 : 1 : 1.487
Unit Cell V:
405.95 ų (Calculated from Unit Cell)
Z:
2
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 6.985 Å | (39) |
| 3.727 Å | (33) |
| 3.314 Å | (100) |
| 3.073 Å | (24) |
| 3.036 Å | (33) |
| 2.810 Å | (87) |
| 2.125 Å | (20) |
| 1.748 Å | (24) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 22 : Hydration and low-𝑇 subsurface aqueous alteration (see also #23) | |
| High-𝑇 alteration and/or metamorphism | |
| 32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits | |
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] |
Type Occurrence of Lombardoite
General Appearance of Type Material:
Orange brown, subhedral crystals (< 0.5 mm) in thin masses. Well-formed crystals, typically platy tablets, are very rare.
Place of Conservation of Type Material:
Mineralogical collections of the Museo Regionale di Scienze Naturali, Sezione di Mineralogia, Petrografia e Geologia, via Giovanni Giolitti 36, I-10123 Torino, Italy, catalogue number M/U 17111.
Geological Setting of Type Material:
Fe–Mn ore in metaquartzites.
Associated Minerals at Type Locality:
Synonyms of Lombardoite
Relationship of Lombardoite to other Species
Member of:
Other Members of this group:
| Aldomarinoite | Sr2Mn3+(AsO4)2(OH) | Mon. 2/m : P21/m |
| Arsenbrackebuschite | Pb2Fe3+(AsO4)2(OH) | Mon. 2/m : P2/m |
| Arsentsumebite | Pb2Cu(AsO4)(SO4)(OH) | Mon. 2/m : P21/m |
| Bearthite | Ca2Al(PO4)2(OH) | Mon. 2/m : P21/m |
| Brackebuschite | Pb2Mn3+(VO4)2(OH) | Mon. 2/m : P21/m |
| Bushmakinite | Pb2Al(PO4)(VO4)(OH) | Mon. 2/m : P21/m |
| Calderónite | Pb2Fe3+(VO4)2(OH) | Mon. 2/m : P21/m |
| Canosioite | Ba2Fe3+(AsO4)2(OH) | Mon. 2/m : P21/m |
| Feinglosite | Pb2Zn(AsO4)2 · H2O | Mon. 2/m |
| Ferribushmakinite | Pb2Fe3+(PO4)(VO4)(OH) | Mon. 2/m : P21/m |
| Gamagarite | Ba2Fe3+(VO4)2(OH) | Mon. 2/m : P21/m |
| Goedkenite | Sr2Al(PO4)2(OH) | Mon. 2/m : P21/m |
| Grandaite | Sr2Al(AsO4)2(OH) | Mon. 2/m : P21/m |
| Tokyoite | Ba2Mn3+(VO4)2(OH) | Mon. 2/m : P21/m |
| Tsumebite | Pb2Cu(PO4)(SO4)(OH) | Mon. 2/m : P21/m |
| Unnamed (possible ordered As-analogue of Tokyoite) | Ba2Mn[(As,V)O4]2(OH) | Mon. 2/m : P21/m |
Common Associates
Related Minerals - Strunz-mindat Grouping
| 8.BG. | Canosioite | Ba2Fe3+(AsO4)2(OH) |
| 8.BG. | Aldomarinoite | Sr2Mn3+(AsO4)2(OH) |
| 8.BG. | Dongchuanite | Pb4ZnZn2(PO4)4(OH)2 |
| 8.BG. | Cuprodongchuanite | Pb4CuZn2(PO4)4(OH)2 |
| 8.BG.05 | Arsentsumebite | Pb2Cu(AsO4)(SO4)(OH) |
| 8.BG.05 | Bearthite | Ca2Al(PO4)2(OH) |
| 8.BG.05 | Brackebuschite | Pb2Mn3+(VO4)2(OH) |
| 8.BG.05 | Gamagarite | Ba2Fe3+(VO4)2(OH) |
| 8.BG.05 | Goedkenite | Sr2Al(PO4)2(OH) |
| 8.BG.05 | UM1994-19-PO:CuHMoPb | Pb2Cu(PO4)(MoO4,AsO4,CrO4,GaO4)(OH) |
| 8.BG.05 | Tsumebite | Pb2Cu(PO4)(SO4)(OH) |
| 8.BG.05 | Arsenbrackebuschite | Pb2Fe3+(AsO4)2(OH) |
| 8.BG.05 | Feinglosite | Pb2Zn(AsO4)2 · H2O |
| 8.BG.05 | Bushmakinite | Pb2Al(PO4)(VO4)(OH) |
| 8.BG.05 | Tokyoite | Ba2Mn3+(VO4)2(OH) |
| 8.BG.05 | Calderónite | Pb2Fe3+(VO4)2(OH) |
| 8.BG.05 | Ferribushmakinite | Pb2Fe3+(PO4)(VO4)(OH) |
| 8.BG.05 | Unnamed (possible ordered As-analogue of Tokyoite) | Ba2Mn[(As,V)O4]2(OH) |
| 8.BG.10 | Mélonjosephite | CaFe2+Fe3+(PO4)2(OH) |
| 8.BG.15 | Tancoite | LiNa2Al(PO4)(PO3OH)(OH) |
| 8.BG.20 | Dmisokolovite | K3Cu5AlO2(AsO4)4 |
| 8.BG.25 | Shchurovskyite | K2CaCu6O2(AsO4)4 |
| 8.BG.30 | Wrightite | K2Al2O(AsO4)2 |
| 8.BG.35 | Polyarsite | Na7CaMgCu2(AsO4)4F2Cl |
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 Lombardoite
mindat.org URL:
https://www.mindat.org/min-50252.html
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References for Lombardoite
Reference List:
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2016) New minerals and nomenclature modifications approved in 2016, CNMNC Newsletter No. 33. Mineralogical Magazine, 80 (6) 1135-1144 doi:10.1180/minmag.2016.080.085
Cámara, Fernando, Baratelli, Lisa, Ciriotti, Marco E., Nestola, Fabrizio, Piccoli, Gian Carlo, Bosi, Ferdinando, Bittarello, Erica, Hålenius, Ulf, Balestra, Corrado (2022) As-bearing new mineral species from Valletta mine, Maira Valley, Piedmont, Italy: IV. Lombardoite, Ba2Mn3+(AsO4)2(OH) and aldomarinoite, Sr2Mn3+(AsO4)2(OH), description and crystal structure. Mineralogical Magazine, 86 (3) 447-458 doi:10.1180/mgm.2022.31
Localities for Lombardoite
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.
Italy (TL) | |
| Mineralogical Magazine +3 other references |
Quick NavTopAbout LombardoiteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsRelationshipsCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Valletta Mine, Vallone della Valletta, Canosio, Cuneo Province, Piedmont, Italy