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Bredigite (Bredigit)

Pictures (1 Images total)

Bredigit
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Bredigit
Durch Hämatit rötlichbraun gefärbter Bredigit in gehlenitreicher, heller Matrix. Fundort: Steinbruch Bellerberg, Ettringen, Eifel, Rheinland-Pfalz, Deutschland. Bildbreite: 3 mm.
Copyright: raritätenjäger; Contribution: raritätenjäger
Collection: raritätenjäger
Location: Deutschland/Rheinland-Pfalz/Mayen-Koblenz-Kreis/Mayen/Ettringen/Bellerberg/Ettringer Bellerberg (Stbr. Caspar)
Mineral: Bredigite
Image: 1300971393
Rating: 5.5 (votes: 2)
License: Usage for Mineralienatlas project only
Bredigit

Durch Hämatit rötlichbraun gefärbter Bredigit in gehlenitreicher, heller Matrix. Fundort: Steinbruch Bellerberg, Ettringen, Eifel, Rheinland-Pfalz, Deutschland. Bildbreite: 3 mm.
Collection: raritätenjäger
Copyright: raritätenjäger
Contribution: raritätenjäger 2011-03-24
Locality: Ettringer Bellerberg (Stbr. Caspar) / Bellerberg / Ettringen / Mayen / Mayen-Koblenz-Kreis / Rheinland-Pfalz / Deutschland

You find additional Bredigit specimen at the Geolitho Museum

Collectors Summary

Color farblos, grau
Streak color weiß
Cleavages schlecht
Solubility +++ Säuren
Crystal System orthorhombisch, Pnnm

Chemism

Chemical formula

Ca7Mg(SiO4)4

Empirical formula (analysis)

(Ca7.006Na0.015Ba0.014)Σ7.035Mg0.938(Si4.000P0.014)Σ4.014O16

Chemical composition

Calcium, Magnesium, Silicium, Sauerstoff

Unit weight: 674.6214836898 u; Number of atoms in the formula: 27.987

Info

Empirical formula:

(Ca7.006Na0.015Ba0.014)5Mg0.938(Si4.000P0.014)4O16

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Oxygen

O

37.95

16

57.17

15.9994300

255.9908800
Sodium

Na

0.05

0.02

0.05

22.9897702

0.3448466
Magnesium

Mg

3.38

0.94

3.35

24.3050600

22.7981463
Silicon

Si

16.65

4

14.29

28.0855300

112.3421200
Phosphorus

P

0.06

0.01

0.05

30.9737612

0.4336327
Calcium

Ca

41.62

7.01

25.03

40.0784000

280.7892704
Barium

Ba

0.28

0.01

0.05

137.3277000

1.9225878

Strunz 9th edition incl. updates

9.AD.20

9: Silikate (Germanate)
A: Inselsilikate (Nesosilikate)
D: Insel(Neso)silikate ohne weitere Anionen; Kationen in oktahedraler [6] und gewöhnlich größerer Koordination
20:Bredigit-Gruppe

Lapis Classification

VIII/A.07-020

VIII: SILIKATE
A: Inselsilikate mit [SiO4] 4--Baugruppen
7: Kationen in oktaedrischer Koordination [6]

Classification by Hölzel

9.AB.280

9: SILICATES
A: Nesosilicates
B: Olivine-Group

Dana 8th edition

51.04.01.01

51: Nesosilicate Minerals
04: Nesosilicates Nesosilicate Insular SiO4 Groups Only with cations in [6] and >[6] coordination

IMA status

Erstbeschreibung vor CNMNC-Gründung (1959), als Mineral meist anerkannt

Mineral status

anerkanntes Mineral

Optical Properties

Color

farblos, grau

Streak color

weiß

max. Birefringence

0.013
Birefringence chart\! Bredigite title=Birefringence chart Bredigite

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

1.712

RI value β

1.716

RI value γ / ε

1.725

Ri mean

1.718

2V angle

Biaxial (+) 30°~

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mmm

Space Group number

58

Space Group

Pnnm

Cell parameters a (Å)

18.38102(17)

Cell parameters b (Å)

6.74936(7)

Cell parameters c (Å)

10.90328(11)

Cell parameters a/b or c/a

2.723

Cell parameters c/b

1.615

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

4

Volumne (ų)

1352.662

X-Ray Powder Diffraction

2.736(100),
2.728(100),
2.672(100),
2.233(30),
2.215(20),
1.924(30),
1.899(20),
1.562(20)
XRD chart Bredigite

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

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Density (g/cm³)

3.40 (gemessen)

3.312 ( ρ calc. Mineralienatlas )

Cleavages

schlecht

Instability

+++ Säuren

(Co-)Type locality

(Co-)Type locality

UK/Nordirland/Antrim Co./Larne/Scawt Hill

Preface

Author (Name, Year)

Tilley & Vincent, 1948

References

Mineralogical Magazine 28 (1948), 255

CNMNC Newsletter No. 50; Mineralogical Magazine, 31 [Formel]

Volker Kahlenberg, Irina Galuskina, Biljana Krüger, Anuschka Pauluhn & Evgeny Galuskin - Structural investigations on bredigite from the Hatrurim Complex - Mineralogy and Petrology volume 113, 261–272 (2019)

Kahlenberg, V., Prosser, L., Salzmann, M.F. et al. On the incorporation of strontium into the crystal structure of bredigite: structural effects and phase transition. Miner Petrol (2021). https://doi.org/10.1007/s00710-021-00771-x

Other languages

German

Bredigit

Spanish

Bredigita

French

Bredigite

English

Bredigite

Russian

Бредигит

CNMNC symbol

Symbol

Bdi

Locations with GPS information