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Bredigite

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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 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

IDs

GUSID (Global unique identifier short form) 03IQFsY4QEyGIhqw72uvIQ
GUID (Global unique identifier) 161072D3-38C6-4C40-8622-1AB0EF6BAF21
Database ID 487