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Lombardoite

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Lombardoit
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Lombardoit
brauner Lombardoit in Quarz, Valletta Mine, Aisone, Cuneo Province, Piemont, Italien; BB ~ 1 mm
Copyright: Joy Desor; Contribution: openpit
Location: Italien/Piemont (Piemonte), Region/Cuneo, Provinz/Dora-Maira-Massiv/Valle Maira/Canosio/Vallone della Valletta/La Valletta Mine
Mineral: Lombardoite
Image: 1582999984
License: Usage for Mineralienatlas project only
Lombardoit

brauner Lombardoit in Quarz, Valletta Mine, Aisone, Cuneo Province, Piemont, Italien; BB 1 mm

Copyright: Joy Desor
Contribution: openpit 2020-02-29
Locality: La Valletta Mine / Vallone della Valletta / Canosio / Valle Maira / Dora-Maira-Massiv / Cuneo, Provinz / Piemont (Piemonte), Region / Italien

Collectors Summary

Crystal System monoklin, P21/m

Additional information / Summary

Lombardoit kommt Polytyp vor:

P21/m, a= 7.864Å, b = 6.134 Å, c = 9.120 Å, β = 112.66°

P1, a = 14.300 Å, b = 6.118 Å, c = 9.420 Å, α = 90.008°, β = 100.013°, γ = 102.299°

Chemism

Chemical formula

Ba2Mn3+(AsO4)2(OH)

Chemical composition

Arsen, Barium, Mangan, Sauerstoff, Wasserstoff

Unit weight: 624.4394709 u; Number of atoms in the formula: 15

Info

Empirical formula:

Ba2Mn(AsO4)2(OH)

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.16

1

6.67

1.0079470

1.0079470

Oxygen

O

23.06

9

60.00

15.9994300

143.9948700

Manganese

Mn

8.80

1

6.67

54.9380499

54.9380499

Arsenic

As

24.00

2

13.33

74.9216020

149.8432040

Barium

Ba

43.98

2

13.33

137.3277000

274.6554000

Strunz 9th edition incl. updates

8.BG.05

8: Phosphate, Arsenate, Vanadate
B: Phosphate, etc., mit weitere Anionen, ohne H2O
G: Mit mittelgroßen und großen [Kationen] (OH, etc.):RO4 = 0.5:1
05:Brackebuschit-Gruppe

IMA status

anerkannt - CNMNC Newsletter No. 33, Oktober 2016

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Brackebuschite supergroup  ⇒ Brackebuschite group

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

11

Space Group

P21/m

Cell parameters a (Å)

7.8636(1)

Cell parameters b (Å)

6.13421(8)

Cell parameters c (Å)

9.1197(1)

Cell parameters a/b or c/a

1.282

Cell parameters c/b

1.487

Cell parameters α

90°

Cell parameters β

112.660(2)°

Cell parameters γ

90°

Z

2

Volumne (ų)

405.949

Kristall structure

Struktur bestimmt

X-Ray Powder Diffraction

6.985(39), 3.727(33), 3.314(100), 3.073(24), 3.036(33), 3.034(33), 2.813(87), 2.807(87)

XRD chart Lombardoite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Physical Properties

Density (g/cm³)

5.124 ber.

5.108 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

Italien/Piemont (Piemonte), Region/Cuneo, Provinz/Dora-Maira-Massiv/Valle Maira/Canosio/Vallone della Valletta/La Valletta Mine

Type material

Museo Regionale di Scienze Naturali, Sezione di Mineralogia, Petrografia e Geologia, via Giovanni Giolitti 36, I-10123 Torino, Italien

Collection number of type material

M/U 17111

Paragenesis of type material

Quarz, Aegirin, Baryt, Calcit, Hämatit, Muscovit, Kryptomelan, Braunit, Manganberzeliit

Preface

Name from

Bruno Lombardo (1944–2014), Geologe und Petrologe am C.N.R. (National Research Council of Italy)

Author (Name, Year)

Fernando Cámara; Lisa Baratelli; Marco E. Ciriotti; Fabrizio Nestola; Gian Carlo Piccoli, Ferdinando Bosi; Erica Bittarello; Ulf Hålenius; Corrado Balestra (2022)

References

Cámara, F., Bosi, F., Ciriotti, M.E., Bittarello, E., Hålenius, U. and Balestra, C. - Lombardoite, IMA 2016-058. CNMNC Newsletter No. 33, October 2016, page 1141; Mineralogical Magazine, 80 (2016), 1135–1144.

Fernando Cámara; Lisa Baratelli; Marco E. Ciriotti; Fabrizio Nestola; Gian Carlo Piccoli, Ferdinando Bosi; Erica Bittarello; Ulf Hålenius; Corrado Balestra: 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 Vol. 86, Nr. 3 (2022) S. 447-458. doi: 10.1180/mgm.2022.31

Fernando Cámara, Ciriotti E. Marco - POLYTYPISM, TOPOLOGICAL AND CRYSTALCHEMICAL RELATIONS AMONG NATROCHALCITE GROUP AND BRACKEBUSCHITE GROUP MINERALS - Resarchgate 2016

IMA group assignments


 
 
M2+2M3+(TO4)2(OH)
 
 

 
 
 
Pb2(Fe3+,Zn)(AsO4)2(OH,H2O)
monoklin
P21/m

 
 
 
Pb2Cu(AsO4)(SO4)OH
monoklin
P21/m

 
 
 
Ca2Al(PO4)2(OH)
monoklin
P21/m

 
 
 
Pb2Mn3+(VO4)2(OH)
monoklin
P21/m

 
 
 
Pb2Fe3+[OH|(VO4)2]
monoklin
P21/m

 
 
 
Ba2Fe3+(AsO4)2(OH)
monoklin
P21/m

 
 
 
Pb2Zn(AsO4)2·H2O
monoklin
P21, P21/m

 
 
 
Pb2Fe3+(PO4)(VO4)(OH)
monoklin
P21/m

 
 
 
Ba2Fe3+(VO4)2(OH)
monoklin
P21/m

 
 
 
(Sr,Ca)2Al(PO4)2(OH)
monoklin
P21/m

 
 
 
Sr2Al(AsO4)2(OH)
monoklin
P21/m

 
 
 
Pb5Fe22+(VO4)2O4
monoklin
P21/m

 
 
 
Ba2Mn3+(AsO4)2(OH)
monoklin
P21/m

 
 
 
Ba2Mn(VO4)2(OH)
monoklin
P21/m

 
 
 
Pb2Cu(PO4)(SO4)(OH)
monoklin
P21/m

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Actuality: 30. Jan 2023 - 13:34:49

Other languages

German

Lombardoit

English

Lombardoite

Russian

Ломбардоит

CNMNC (IMA)-Number

IMA 2016-058

CNMNC symbol

Symbol

Lmb

Locations with GPS information