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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-...

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

Volumne (ų)

1465.75

Kristall 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

Related minerals "Strunz Classification" (9. Edition) [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Medaite

(Mn,Ca)6(V5+,As)Si5O18(OH)

monoklin : 2/m : P21/n

9.BJ.30

Arsenmedaite

Mn2+6As5+Si5O18(OH)

monoklin : 2/m : P21/n

9.BJ.30

Related minerals "Lapis Classification" [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Ardennite-(V)

Mn4[Al4(AlMg)][Si5V]O22(OH) 6

orthorhombisch : mmm : Pnmm

VIII/C.34-010

Ardennite-(As)

Mn2+4[Al4(Mg,Al,Fe3+,Mn3+)2][Si5(As5+,V5+)]O22(OH)6

orthorhombisch : mmm : Pmmm

VIII/C.34-010

Cassagnaite

(Ca,Mn2+)4(Fe3+,Mn3+,Al)4(OH)4(V3+,Mg,Al)2(O,OH)4(Si3O10)(SiO4)2

orthorhombisch : mmm : Cmcm

VIII/C.34-012

Tiragalloite

Mn42+As5+Si3O12(OH)

monoklin : 2/m : P21/n

VIII/C.34-013

Medaite

(Mn,Ca)6(V5+,As)Si5O18(OH)

monoklin : 2/m : P21/n

VIII/C.34-014

Lavoisierite

Mn2+8[Al10(Mn3+Mg)][Si11P]O44(OH)12

orthorhombisch : mmm : Pnmm

VIII/C.34-015

Scheuchzerite

Na(Mn,Mg,Zn)9[VSi9O28(OH)](OH)3

triklin : 1 : P1

VIII/C.34-015

Saneroite

Na2(Mn2+,Mn3+)10Si11VO34(OH)4

triklin : 1 : P1

VIII/C.34-016

Orientite

Ca8Mn3+10(SiO4)3(Si3O10)3(OH)10·4H2O

orthorhombisch : mm2 : P2mm

VIII/C.34-020

Arsenmedaite

Mn2+6As5+Si5O18(OH)

monoklin : 2/m : P21/n

VIII/C.34-035

Other languages

German

Arsenmedait

English

Arsenmedaite

IMA Number

IMA 2016-099

Automatic Links to external internet sources (Responsibility is with the operator)

German pages

DeWikiPedia - search for: Arsenmedait
Google-Bilder-Suche - search for: Arsenmedait
Mineralogisch-Petrographisches-Institut Hamburg - search for: Arsenmedait

English pages

Mindat - search for: Arsenmedaite
Webmineral - search for:Arsenmedaite
Handbook-of-Mineralogy - search for: Arsenmedaite
RRUFF - Raman, XRD and other mineral data - search for: Arsenmedaite
RRUFF - References and PDF downloads - search for: Arsenmedaite
American-Mineralogist-Crystal-Structure-Database - search for: Arsenmedaite
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Mineral Dealer

German pages

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