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Kummerite (Kummerit)

Collectors Summary

Color bernsteingelb
Cleavages gut parallel zu {010}
Crystal System triklin, P1

Chemism

Chemical formula

Mn2+Fe3+Al(PO4)2(OH)2·8H2O

Empirical formula (analysis)

(Mn2+0.37Mg0.27Zn0.03Fe2+0.33)Σ1.00(Fe3+1.06Al0.94)Σ2.00(PO4)1.91(OH)2.27(H2O)7.73

Chemical composition

Aluminium, Eisen, Mangan, Phosphor, Sauerstoff, Wasserstoff

Unit weight: 491.099929973 u; Number of atoms in the formula: 40.28

Info

Empirical formula:

(Mn0.37Mg0.27Zn0.03Fe0.33)(Fe1.06Al0.94)(PO4)1.91(OH)2.27(H2O)7.73

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

3.64

17.73

44.02

1.0079470

17.8709003

Oxygen

O

57.47

17.64

43.79

15.9994300

282.2299452

Magnesium

Mg

1.34

0.27

0.67

24.3050600

6.5623662

Aluminium

Al

5.16

0.94

2.33

26.9815382

25.3626459

Phosphorus

P

12.05

1.91

4.74

30.9737612

59.1598839

Manganese

Mn

4.14

0.37

0.92

54.9380499

20.3270785

Iron

Fe

15.81

1.39

3.45

55.8452000

77.6248280

Zinc

Zn

0.40

0.03

0.07

65.4094000

1.9622820

Analysis wt%

Fe2O3 : 17.2, FeO : 4.8, MnO : 5.4, MgO : 2.2, ZnO : 0.5, Al2O3 : 9.8, P2O5 : 27.6, H2O : 32.5, Total : 100 wt%.

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Laueite supergroup

Optical Properties

Color

bernsteingelb

max. Birefringence

0.065

Birefringence chart\! Kummerite title=Birefringence chart Kummerite

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

α = 1.565(5)

RI value β

β = 1.600(5)

RI value γ / ε

γ = 1.630(5)

Ri mean

1.598

2V angle

Biaxial (-)

Dispersion

schwach

Pleochroism

schwach mit Bernstein-Gelbtönen

Crystallography

Crystal System

triklin

Class (H-M)

1

Space Group number

2

Space Group

P1

Cell parameters a (Å)

5.316(1)

Cell parameters b (Å)

10.620(3)

Cell parameters c (Å)

7.118(1)

Cell parameters a/b or c/a

0.501

Cell parameters c/b

0.67

Cell parameters α

107.33 (3)°

Cell parameters β

111.22 (3)°

Cell parameters γ

72.22 (2)°

Z

1

Volumne (ų)

348.679

Kristall structure

Laueit-Supergruppe; Struktur bestimmt

X-Ray Powder Diffraction

9.885(100), 6.476(20), 4.942(30), 3.988(9), 3.255(8), 3.235(9), 3.116(18), 2.873(11)

XRD chart Kummerite

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

Physical Properties

Density (g/cm³)

2.34 (berechnet)

2.339 ( ρ calc. Mineralienatlas )

Cleavages

gut parallel zu {010}

(Co-)Type locality

(Co-)Type locality

Deutschland/Bayern/Oberpfalz, Bezirk/Neustadt an der Waldnaab, Landkreis/Waidhaus/Hagendorf/Hagendorf-Süd (Grube Cornelia)

Type material

Mineralogische Sammlung des Museum Victoria, Melbourne, Victoria, Australien

Collection number of type material

M53448

Paragenesis of type material

Jahnsit-(CaMnMn) und Al-haltiger Frondelit

Preface

Author (Name, Year)

Ian E. Grey, Erich Keck, W. Gus Mumme, Allan Pring, Colin M. MacRae, Finlay L. Shanks und Jason R. Price (2015)

References

Grey, I.E., Keck, E., Mumme, W.G., Pring, A., MacRae, C.M., Shanks, F.L. and Price, J.R. (2015) Kummerite, IMA 2015-036. CNMNC Newsletter No. 26, August 2015, page 946; Mineralogical Magazine, 79, 941 - 947.

Grey, I. E.; Keck, E.; Mumme, W. G.; Pring, A.; Macrae, C. M.; Glenn, A. M.; Shanks, F. L.; Mills, S. J. - Kummerite, Mn2+Fe3+Al(PO4)2(OH)2·8H2O, a new laueite-group mineral from the Hagendorf Süd pegmatite, Bavaria, with ordering of Al and Fe3+ - Mineralogical Magazine [PREPUBLICATION 18 Feb. 2016]

IMA group assignments

Other languages

German

Kummerit

English

Kummerite

IMA Number

IMA 2015-036

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

German pages

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

English pages

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

German pages

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Crystal-Treasure.com - search for: Kummerit
Bosse - search for: Kummerit

Locations with GPS information




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