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Middlebackite

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Middlebackit
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1579544110
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Middlebackit
blauer Middlebackit, San Lugano, Etschtal, Südtirol, Italien; BB ~ 1 mm
Copyright: Joy Desor; Contribution: openpit
Location: Italien/Trentino-Südtirol (Trentino-Alto Adige)/Südtirol (Bozen), Provinz/San Lugano
Mineral: Middlebackite
Image: 1579544110
License: Usage for Mineralienatlas project only
Middlebackit

blauer Middlebackit, San Lugano, Etschtal, Südtirol, Italien; BB 1 mm

Copyright: Joy Desor
Contribution: openpit 2020-01-20
Locality: San Lugano / Südtirol (Bozen), Provinz / Trentino-Südtirol (Trentino-Alto Adige) / Italien

Collectors Summary

Color türkisblau
Crystal System monoklin, P21/c

Additional information / Summary

Das neue Mineral wurde bereits 1990 gefunden, aber erst nach 25 Jahren als neues Mineral identifiziert.

Chemism

Chemical formula

Cu2C2O4(OH)2

Empirical formula (analysis)

Cu2.00(C2O4)Cl0.02(OH)1.98

Chemical composition

Kupfer, Kohlenstoff, Sauerstoff, Wasserstoff

Unit weight: 249.49555046 u; Number of atoms in the formula: 11.98

Info

Empirical formula:

Cu2.00(C2O4)Cl0.02(OH)1.98

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.80

1.98

16.53

1.0079470

1.9957351

Carbon

C

9.63

2

16.69

12.0107800

24.0215600

Oxygen

O

38.35

5.98

49.92

15.9994300

95.6765914

Chlorine

Cl

0.28

0.02

0.17

35.4532000

0.7090640

Copper

Cu

50.94

2

16.69

63.5463000

127.0926000

Strunz 9th edition incl. updates

10.AB.15

10: Organische Verbindungen
A: Salze organischer Säuren
B: Oxalate
15:Moolooit-Gruppe

Lapis Classification

IX/A.01-095

IX: ORGANISCHE VERBINDUNGEN
A: Salze organischer Säuren
1: Oxalate [C2O4] 2-

IMA status

anerkannt März 2016 - CNMNC Newsletter No. 30, April 2016

Mineral status

anerkanntes Mineral

Optical Properties

Color

türkisblau

Diaphaneity (Transparency)

durchscheinend

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

14

Space Group

P21/c

Cell parameters a (Å)

7.268(1)

Cell parameters b (Å)

5.749(1)

Cell parameters c (Å)

5.684(1)

Cell parameters a/b or c/a

1.264

Cell parameters c/b

0.989

Cell parameters α

90°

Cell parameters β

104.51(2)°

Cell parameters γ

90°

Z

2

Volume (ų)

229.923

Crystal structure

Neuer Strukturtyp; Struktur bestimmt

X-Ray Powder Diffraction

7.070(16),
3.739(100),
2.905(7),
2.860(18),
2.760(6),
2.481(12),
2.373(8),
2.350(9)

XRD chart Middlebackite

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

Crystals 3D

Open larger view

Physical Properties

Density (g/cm³)

3.64 ber.

3.604 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

Australien/South Australia/Eyre Peninsula/Middleback Range/Iron Knob/Iron Monarch Opencut

Type material

Mineralogische Sammlung des South Australian Museum, Adelaide, Australia

Collection number of type material

G34300

Paragenesis of type material

Atacamit, Mottramit

Preface

Name from

Der Typlokalität "Middleback Range"

Author (Name, Year)

Peter Elliot (2019)

References

Elliott P (2016) Middlebackite, IMA 2015-115. CNMNC Newsletter No. 30, April 2016; Mineralogical Magazine 80.

Peter Elliott: Middlebackite, a new Cu oxalate mineral from Iron Monarch, South Australia: Description and crystal structure. Mineralogical Magazine Vol. 83, Nr. 3 (2019) S. 427-433.

Other languages

German

Middlebackit

English

Middlebackite

Russian

Миддлбекит

CNMNC (IMA)-Number

IMA 2015-115

CNMNC symbol

Symbol

Mbk

Locations with GPS information

IDs

GUSID (Global unique identifier short form) jhbLGpEW5kSTRBENren8gg
GUID (Global unique identifier) 1ACB168E-1691-44E6-9344-110DADE9FC82
Database ID 8095