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Congolite (Congolit)

Pictures (2 Images total)

Congolith
Views (File:
1617575042
): 480
Congolith
Congolith-Kristall (Kantenlänge = 2,5 mm); Kaliwerk Bismarckshall, Bischofferode, Eichsfeld, Thüringen, BRD; Bildbreite: 6,5 mm
Copyright: chribiedav; Contribution: chribiedav
Collection: chribiedav
Location: Deutschland/Thüringen/Eichsfeld, Landkreis/Am Ohmberg/Bischofferode
Mineral: Congolite
Image: 1617575042
Rating: 9 (votes: 1)
License: Usage for Mineralienatlas project only
Congolith

Congolith-Kristall (Kantenlänge = 2,5 mm); Kaliwerk Bismarckshall, Bischofferode, Eichsfeld, Thüringen, BRD; Bildbreite: 6,5 mm
Collection: chribiedav
Copyright: chribiedav
Contribution: chribiedav 2021-04-05
Locality: Bischofferode / Am Ohmberg / Eichsfeld, Landkreis / Thüringen / Deutschland
Congolith
Views (File:
1300971445
): 2201
Congolith
Blockiger, lachsrosa Congolith-Kristall von ca. 2,5 mm Kantenlänge. Fundort: Kaliwerk Bismarckshall, Bischofferode, Südharz, Thüringen, Deutschland.
Copyright: raritätenjäger; Contribution: raritätenjäger
Collection: raritätenjäger
Location: Deutschland/Thüringen/Eichsfeld, Landkreis/Am Ohmberg/Bischofferode
Mineral: Congolite
Image: 1300971445
Rating: 4.5 (votes: 2)
License: Usage for Mineralienatlas project only
Congolith

Blockiger, lachsrosa Congolith-Kristall von ca. 2,5 mm Kantenlänge. Fundort: Kaliwerk Bismarckshall, Bischofferode, Südharz, Thüringen, Deutschland.
Collection: raritätenjäger
Copyright: raritätenjäger
Contribution: raritätenjäger 2011-03-24
Locality: Bischofferode / Am Ohmberg / Eichsfeld, Landkreis / Thüringen / Deutschland

Collectors Summary

Color blassrot
Crystal System trigonal, R3c

Chemism

Chemical formula

(Fe2+,Mg,Mn)3B7O13Cl

Chemical composition

Chlor, Eisen, Magnesium, Mangan, Bor, Sauerstoff

Unit weight: 458.00501897 u; Number of atoms in the formula: 24

Info

Empirical formula:

(Fe0.6Mg0.3Mn0.1)3B7O13Cl

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Boron

B

16.52

7

29.17

10.8117000

75.6819000
Oxygen

O

45.41

13

54.17

15.9994300

207.9925900
Magnesium

Mg

4.78

0.9

3.75

24.3050600

21.8745540
Chlorine

Cl

7.74

1

4.17

35.4532000

35.4532000
Manganese

Mn

3.60

0.3

1.25

54.9380499

16.4814150
Iron

Fe

21.95

1.8

7.50

55.8452000

100.5213600

Strunz 9th edition incl. updates

6.GA.10

6: Borate
G: Heptaborate und andere Megaborate
A: Gerüst-Heptaborate (.05); Schicht-Nanoborate (.10 bis .20); Gerüst-Dodekaborate (.25); Mega-Gerüst-Borate (.30 bis .35)
10:Congolith-Gruppe

Lapis Classification

V/L.04-040

V: NITRATE, CARBONATE UND BORATE
L: Gerüstborate mit [BO2] 1- bis [B12O24] 12-

Classification by Hölzel

6.GA.160

6: Borates
G: Heptaborates and further megaborates
A:
1: Boracite-Group - 7(P+6T), 7(7T)

Dana 8th edition

25.06.02.01

25: Anhydrous Borates Containing Hydroxyl or Halogen
06: Anhydrous Borates Containing Hydroxyl or Halogen
02: Boracite Group (Trigonal: R3c)

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

blassrot

max. Birefringence

0.023
Birefringence chart\! Congolite title=Birefringence chart Congolite

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

1.755

RI value γ / ε

1.731

Ri mean

1.747

2V angle

Uniaxial (-)

Crystallography

Crystal System

trigonal

Class (H-M)

3m

Space Group number

167

Space Group

R3c

Cell parameters a (Å)

8.623

Cell parameters b (Å)

-

Cell parameters c (Å)

21.054

Cell parameters a/b or c/a

2.442

Cell parameters c/b

-

Z

6

Volumne (ų)

1355.758

X-Ray Powder Diffraction

3.05(80),
2.725(100),
2.158(60),
2.153(60),
2.061(70),
2.058(70),
1.838(70),
1.834(70)
XRD chart Congolite

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)

3.503 (gemessen)

3.366 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

Republik Kongo/Kouilou, Region

Preface

Author (Name, Year)

Wendling & von Hodenberg & Kühn, 1972

References

Kali und Steinsalz 6 (1972), 1

Other languages

Spanish

Congolita

English

Congolite

French

Congolite

German

Congolith

Russian

Конголит

Alternative Name

German

Congolit

Fe-Borazit

CNMNC (IMA)-Number

IMA 1971-030

CNMNC symbol

Symbol

Cgl

Locations with GPS information