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Bonacinaite

Pictures (1 Images total)

Bonacinait
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Bonacinait
violette Tafel von Bonacinait, Varenche Mine, Saint-Barthélemy, Nus, Aostatal, Italien; BB < 1 mm
Copyright: Joy Desor; Contribution: openpit
Location: Italien/Aostatal (Valle d'Aosta), Region/Nus/St. Barthélemy/Varenche Mine
Mineral: Bonacinaite
Image: 1587234717
License: Usage for Mineralienatlas project only
Bonacinait

violette Tafel von Bonacinait, Varenche Mine, Saint-Barthélemy, Nus, Aostatal, Italien; BB < 1 mm
Copyright: Joy Desor
Contribution: openpit 2020-04-18
Locality: Varenche Mine / St. Barthélemy / Nus / Aostatal (Valle d'Aosta), Region / Italien

Collectors Summary

Crystal System monoklin, P21/n

Chemism

Chemical formula

Sc(AsO4)·2H2O

Empirical formula (analysis)

(Sc0.90Mn3+0.08Fe3+0.01Pb0.01)Σ1.00[(As0.95P0.06)Σ1.01O4] • 2H2O

Chemical composition

Arsen, Scandium, Sauerstoff, Wasserstoff

Unit weight: 202.532907284 u; Number of atoms in the formula: 9.01

Info

Empirical formula:

(Sc0.90Mn0.08Fe0.01Pb0.01)[(As0.95P0.06)O4] • 2H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

1.00

2

22.20

1.0079470

2.0158940
Oxygen

O

39.50

5

55.49

15.9994300

79.9971500
Phosphorus

P

0.92

0.06

0.67

30.9737612

1.8584257
Scandium

Sc

19.98

0.9

9.99

44.9559108

40.4603197
Manganese

Mn

2.17

0.08

0.89

54.9380499

4.3950440
Iron

Fe

0.28

0.01

0.11

55.8452000

0.5584520
Arsenic

As

35.14

0.95

10.54

74.9216020

71.1755219
Lead

Pb

1.02

0.01

0.11

207.2100000

2.0721000

Strunz 9th edition incl. updates

8.CD.10

8: Phosphate, Arsenate, Vanadate
C: Phosphate ohne weitere Anionen, mit H2O
D: Mit ausschließlich mittelgroßen Kationen, RO4:H2O = 1:2
10:Variscit-Gruppe

IMA status

Neue Mineralien anerkannt September 2018 von der CNMNC im Newsletter 45

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Metavariscite group

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

14

Space Group

P21/n

Cell parameters a (Ã…)

5.533(1)

Cell parameters b (Ã…)

10.409(2)

Cell parameters c (Ã…)

9.306(2)

Cell parameters a/b or c/a

0.532

Cell parameters c/b

0.894

Cell parameters α

90°

Cell parameters β

91.94(3)°

Cell parameters γ

90°

Z

4

Volume (ų)

535.653

Crystal structure

Das As-Analog von Kolbeckit; Struktur bestimmt. Siehe auch spätere Arbeit von Uwe Kolitsch; Matthias Weil; Vadim M. Kovrugin; Sergey V. Krivovichev: Crystal chemistry of the variscite and metavariscite groups: Crystal structures of synthetic CrAsO4⋅2H2O, TlPO4⋅2H2O, MnSeO4⋅2H2O, CdSeO4⋅2H2O and natural bonacinaite, ScAsO4⋅2H2O. Mineralogical Magazine Vol. 84, Nr. 4 (2020) S. 568-583.

X-Ray Powder Diffraction

4.865(100), 4.638(18), 4.525(32), 3.771(34), 2.924(44), 2.759(31), 2.665(94), 1.733(36)
XRD chart Bonacinaite

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

Physical Properties

Density (g/cm³)

2,82 berechnet aus der empirischen Formel

2.511 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

Italien/Aostatal (Valle d'Aosta), Region/Nus/St. Barthélemy/Varenche Mine

Type material

Das Typenmaterial ist in den mineralogischen Sammlungen des Department of the Earth Sciences der Universität Mailand, Katalognummer MCMGPG-H2018-001 (Holotyp), des Naturhistorischen Museums, Wien, Katalognummer O 571 (Kristall zur Bestimmung der Kristallstruktur) und des Mineralogielabors der Universität Lüttich, Belgien, Katalognummer 21180 (Kristall für optische Messungen) hinterlegt.

Preface

Name from

Der Name ehrt Enrico Bonacina (1928 - 2024), den Pionierfotografen von Mikromineralien in Italien.

Author (Name, Year)

Ciriotti, M. E., Kolitsch, U., Cámara, F., Vignola, P., Hatert, F., Bittarello, E., Bracco, R., Bortolozzi, G. M. (2024)

External links

Forum der Associazione Micro-mineralogica Italiana, Thema Bonacinaite

References

Barresi, A.A., Kolitsch, U., Ciriotti, M.E., Ambrino, P., Bracco, R., Bonacina, E. (2005): La miniera di manganese di Varenche. Micro, 3, 81–122 (in Italian with English, French and German abstracts)

Cámara, F., Ciriotti, M.E., Kolitsch, U., Vignola, P., Hatert, F., Bittarello, E., Bracco, R. and Bortolozzi, G.M. (2018) Bonacinaite, IMA 2018-056. CNMNC Newsletter No. 45, October 2018, page xxx; Mineralogical Magazine, 82, xxx-xxx.

Ciriotti, M. E., Kolitsch, U., Cámara, F., Vignola, P., Hatert, F., Bittarello, E., Bracco, R., Bortolozzi, G. M.: Bonacinaite, Sc(AsO4)  ⋅  2H2O, the first scandium arsenate. Eur. J. Mineral. Vol. 36(2024) S. 863–872. https://doi.org/10.5194/ejm-36-863-2024

Christopher Emproto; Travis A. Olds: New Mineral Names. American Mineralogist Vol. 110, Nr. 5 (2025) S. 826–833. Open Access https://doi.org/10.2138/am-2025-NMN110510

IMA group assignments

Other languages

German

Bonacinait

English

Bonacinaite

CNMNC (IMA)-Number

IMA 2018-056

CNMNC symbol

Symbol

Bci

IDs

GUSID (Global unique identifier short form) eeAxPL36QEalvgv57KNL2w
GUID (Global unique identifier) 3C31E079-FABD-4640-A5BE-0BF9ECA34BDB
Database ID 8569