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Sigismundite (Arrojadit-(BaFe))

Pictures (1 Images total)

bräunlicher krustiger Sigismundit
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bräunlicher krustiger Sigismundit
Italien/Lombardei (Lombardia), Region/Sondrio, Provinz/Spluga Tal/Madesimo/Valle San Giacomo/Groppera Alpe; BB = 2 mm
Copyright: prospector56; Contribution: Münchener Micromounter
Collection: Lithothek der Münchener Micromounter, Collection number: A049532
Location: Italien/Lombardei (Lombardia), Region/Sondrio, Provinz/Spluga Tal/Madesimo/Valle San Giacomo/Groppera Alpe
Mineral: Sigismundite
Image: 1739452269
License: Usage for Mineralienatlas project only
bräunlicher krustiger Sigismundit (SNr: A049532)

Italien/Lombardei (Lombardia), Region/Sondrio, Provinz/Spluga Tal/Madesimo/Valle San Giacomo/Groppera Alpe; BB = 2 mm
Collection: Lithothek der Münchener Micromounter
Copyright: prospector56
Contribution: Münchener Micromounter 2025-02-13
Locality: Groppera Alpe / Valle San Giacomo / Madesimo / Spluga Tal / Sondrio, Provinz / Lombardei (Lombardia), Region / Italien

You find additional specimen at the Geolitho Museum

Collectors Summary

Color grünlichgrau
Streak color weiß
Cleavages two directions at about 110°, one more deutlich than the other
Fracture present, but not identified

Chemism

Chemical formula

(Ba,K,Pb)Na3(Ca,Sr)(Fe,Mg,Mn)14Al(OH)2(PO4)12

Chemical composition

Aluminium, Barium, Blei, Calcium, Eisen, Magnesium, Mangan, Natrium, Strontium, Kalium, Phosphor, Sauerstoff, Wasserstoff

Unit weight: 2084.52874206 u; Number of atoms in the formula: 84

Info

Empirical formula:

(Ba0.6K0.3Pb0.1)Na3(Ca0.75Sr0.25)(Fe0.6Mg0.3Mn0.1)14Al(OH)2(PO4)12

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.10

2

2.38

1.0079470

2.0158940
Oxygen

O

38.38

50

59.52

15.9994300

799.9715000
Sodium

Na

3.31

3

3.57

22.9897702

68.9693106
Magnesium

Mg

4.90

4.2

5.00

24.3050600

102.0812520
Aluminium

Al

1.29

1

1.19

26.9815382

26.9815382
Phosphorus

P

17.83

12

14.29

30.9737612

371.6851344
Potassium

K

0.56

0.3

0.36

39.0983100

11.7294930
Calcium

Ca

1.44

0.75

0.89

40.0784000

30.0588000
Manganese

Mn

3.69

1.4

1.67

54.9380499

76.9132699
Iron

Fe

22.50

8.4

10.00

55.8452000

469.0996800
Strontium

Sr

1.05

0.25

0.30

87.6210000

21.9052500
Barium

Ba

3.95

0.6

0.71

137.3277000

82.3966200
Lead

Pb

0.99

0.1

0.12

207.2100000

20.7210000

Analysis wt%

Ø P2O5 : 40.50, Al2O3 : 2.45, FeO : 27.64, MgO : 10.85, MnO : 0.70, Na2O : 4.44, BaO : 5.68, PbO : 0.76, CaO : 2.09, SrO : 1.09, H2O : 0.86 (Ref: Canadian Mineralogist 96)

Strunz 9th edition incl. updates

8.BF.05

8: Phosphate, Arsenate, Vanadate
B: Phosphate, etc., mit weitere Anionen, ohne H2O
F: Mit mittelgroßen und großen [Kationen] (OH, etc.):RO4 < 0.5:1
05:Arrojadit-Gruppe

Lapis Classification

VII/B.20-040

VII: PHOSPHATE, ARSENATE UND VANADATE ("Phosphate" des Registers immer einschließlich isotyper Arsenate und Vanadate!)
B: Wasserfreie Phosphate, mit fremden Anionen F,Cl,O,OH
20: Mittelgroße und große Kationen: Mg-Cu-Zn und Ca-Na-K-Ba-Pb

Classification by Hölzel

8.BJ.164

8: PHOSPHATES ARSENATES VANADATES
B: Phosphates (+Anions -Water)
J: Phosphates, very large: 1+2, Vmed: 2,3
1: Arrojadite-Group

IMA status

anerkannt 1994, umbenannt nach der Arrojadit Nomenklatur (IMA No. 05-D 2005) von Sigismundit nach Arrojadit-(BaFe).
Im Jahr 2022 wird der alte Name Sigismundit wieder als offizieller Name anerkannt.

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Arrojadite group

Optical Properties

Color

grünlichgrau

Streak color

weiß

RI value α / ω / n

1.65

Ri mean

1.65

2V angle

Biaxial

Crystallography

Cell parameters a (Å)

16.406

Cell parameters b (Å)

9.945

Cell parameters c (Å)

24.470

Cell parameters a/b or c/a

1.650

Cell parameters c/b

2.461

Cell parameters α

90°

Cell parameters β

105.73

Cell parameters γ

90°

Z

4

Volume (ų)

3843.0

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Density (g/cm³)

3.54 (berechnet)

3.603 ( ρ calc. Mineralienatlas )

Cleavages

two directions at about 110°, one more deutlich than the other

Fracture

present, but not identified

Tenacity

spröde

(Co-)Type locality

(Co-)Type locality

Italien/Lombardei (Lombardia), Region/Sondrio, Provinz/Spluga Tal/Madesimo/Valle San Giacomo/Groppera Alpe

References

Gemäß Proposal 22-C wird Arrojadit-(BaFe) umbenannt in Sigismundit, um den historischen Namen zu erhalten. Miyawaki, R., Hatert, F., Pasero, M., and Mills, S. J.: IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) – Newsletter 66, Eur. J. Mineral., 34, 253–257, https://doi.org/10.5194/ejm-34-253-2022, 2022.

IMA group assignments

Other languages

German

Sigismundit

Spanish

Sigismundita

French

Sigismundite

English

Sigismundite

Russian

Сигизмундит

old name

German

Arrojadit-(BaFe)

Miyawaki, R., Hatert, F., Pasero, M., and Mills, S. J.: IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) – Newsletter 66, Eur. J. Mineral., 34, 253–257, https://doi.org/10.5194/ejm-34-253-2022, 2022.

English

Arrojadite-(BaFe)

Miyawaki, R., Hatert, F., Pasero, M., and Mills, S. J.: IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) – Newsletter 66, Eur. J. Mineral., 34, 253–257, https://doi.org/10.5194/ejm-34-253-2022, 2022.

Russian

Арроядит-(BaFe)

CNMNC (IMA)-Number

IMA 1994-033

CNMNC symbol

Symbol

Ajd-BaFe

Locations with GPS information

IDs

GUSID (Global unique identifier short form) BKo_PiAVCESEYgQgB7wb7w
GUID (Global unique identifier) 3E3FAA04-1520-4408-8462-042007BC1BEF
Database ID 3524