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Arsenmedaite (Arsenmedait)

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Arsenmedaite
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Arsenmedaite
Orange arsenmedaite crystals, ID confirmed by Roberto Bracco. Locality: Molinello Mine, Ne, Genoa, Liguria, Italy; Fov: 3 mm; 12/2017; Sony Alpha 7R ii, bellows, Mitutoyo 20x, aperture, Raynox DCR-250 retro, Stack-Master linear actor, stack shot control.
Copyright: Stephan Wolfsried; Contribution: Stefan
Collection: Stephan Wolfsried
Location: Italien/Ligurien (Liguria), Region/Genua (Genova), Metropolitanstadt/Ne/Val Graveglia/Miniera di Molinello
Mineral: Arsenmedaite
Image: 1570465698
License: Usage for Mineralienatlas project only
Arsenmedaite

Orange arsenmedaite crystals, ID confirmed by Roberto Bracco. Locality: Molinello Mine, Ne, Genoa, Liguria, Italy; Fov: 3 mm; 12/2017; Sony Alpha 7R ii, bellows, Mitutoyo 20x, aperture, Raynox DCR-...
Collection: Stephan Wolfsried
Copyright: Stephan Wolfsried
Contribution: Stefan 2019-10-07
Locality: Miniera di Molinello / Val Graveglia / Ne / Genua (Genova), Metropolitanstadt / Ligurien (Liguria), Region / Italien

Collectors Summary

Color rot-orange
Streak color weiß
Lustre Glasglanz
Cleavages gut {100}
Crystal System monoklin, P21/n

Chemism

Chemical formula

Mn2+6As5+Si5O18(OH)

Empirical formula (analysis)

(Mn5.89Ca0.10)Σ5.99[(As0.49V0.17)Σ0.66Si5.35]Σ6.01O17.69(OH)1.31

Chemical composition

Arsen, Mangan, Silicium, Sauerstoff, Wasserstoff

Unit weight: 828.531761661 u; Number of atoms in the formula: 32.31

Info

Empirical formula:

(Mn5.89Ca0.10)[(As0.49V0.17)Si5.35]O17.69(OH)1.31

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.16

1.31

4.05

1.0079470

1.3204106
Oxygen

O

36.69

19

58.81

15.9994300

303.9891700
Silicon

Si

18.14

5.35

16.56

28.0855300

150.2575855
Calcium

Ca

0.48

0.1

0.31

40.0784000

4.0078400
Vanadium

V

1.05

0.17

0.53

50.9415100

8.6600567
Manganese

Mn

39.06

5.89

18.23

54.9380499

323.5851139
Arsenic

As

4.43

0.49

1.52

74.9216020

36.7115850

Analysis wt%

V2O5 = 1.84,
As2O5 = 6.81,
SiO2 = 38.75,
CaO = 0.70,
MnO = 50.28,
H2Ocalc = 1.42,
Total 99.80

Strunz 9th edition incl. updates

9.BJ.30

9: Silikate (Germanate)
B: Gruppensilikate (Sorosilikate)
J: Gruppen(Soro)-Silikate mit Si3O10, Si4O11, etc. Anionen; Kationen in oktahedraler [6] und/oder größerer Koordination
30:Medait-Gruppe

Lapis Classification

VIII/C.34-035

VIII: SILIKATE
C: Gruppensilikate
34: Sonstige Gruppensilikate

IMA status

anerkannt - CNMNC Newsletter 36, 2017

Mineral status

anerkanntes Mineral

Optical Properties

Color

rot-orange

Streak color

weiß

Lustre

Glasglanz

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

14

Space Group

P21/n

Cell parameters a (Å)

6.7099(3)

Cell parameters b (Å)

29.001(1)

Cell parameters c (Å)

7.5668(3)

Cell parameters a/b or c/a

0.231

Cell parameters c/b

0.261

Cell parameters α

90°

Cell parameters β

95.469(3)°

Cell parameters γ

90°

Z

4

Volume (ų)

1465.75

Crystal structure

As Analog von Medait

X-Ray Powder Diffraction

4.777(58),
3.266(100),
3.159(72),
3.094(82),
2.963(83),
2.935(79),
2.788(68),
2.612(98)
XRD chart Arsenmedaite

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

Crystals 3D

Open larger view

Physical Properties

Density (g/cm³)

3.754 ( ρ calc. Mineralienatlas )

Cleavages

gut {100}

(Co-)Type locality

(Co-)Type locality

Italien/Ligurien (Liguria), Region/Genua (Genova), Metropolitanstadt/Ne/Val Graveglia/Miniera di Molinello

Type material

Museo di Storia Naturale, Università di Pisa, Via Roma 79, Calci (Pisa), Italien, Katalognummer: 19901

Dipartimento di Scienze della Terra, dell’Ambiente e della Vita (DISTAV), Università di Genova, Corso Europa 26, Genova, Italien, Katalognummer: MO483

Paragenesis of type material

Braunit, Quarz, Calcit, As-reicher Medait, kalkhaltiger Rhodochrosit, Talk und Ganophyllit

Preface

Author (Name, Year)

Cristian Biagioni, Donato Belmonte, Cristina Carbone, Roberto Cabella, Federica Zaccarini und Corrado Balestra (2017)

References

C., Belmonte, D., Carbone, C., Cabella, R., Zaccarini, F. and Balestra, C. (2017) Arsenmedaite, IMA 2016-099. CNMNC Newsletter No. 36, April 2017, page 405; Mineralogical Magazine, 81, 403-409.

Biagioni, Cristian; Belmonte, Donato; Carbone, Cristina; Cabella, Roberto; Zaccarini, Federica; Balestra, Corrado - Arsenmedaite, Mn62+As5+Si5O18OH, the arsenic analogue of medaite, from the Molinello mine, Liguria, Italy: occurrence and crystal structure - European Journal of Mineralogy Volume 31 Number 1 (2019), p. 117 - 126

Other languages

German

Arsenmedait

English

Arsenmedaite

CNMNC (IMA)-Number

IMA 2016-099

CNMNC symbol

Symbol

Amed

Locations with GPS information

IDs

GUSID (Global unique identifier short form) 43nkQY_MjkKZsjNpkG9Sqg
GUID (Global unique identifier) 41E479E3-CC8F-428E-99B2-3369906F52AA
Database ID 8312