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Biotite (Biotit)

Pictures (190 Images total)

Biotit
Views (File:
1266790144
): 20914, Rating: 9.64
Biotit
Bildbreite: 2 mm; Fundort: In den Dellen (Bimsgrube Zieglowski), Mendig, Eifel, Deutschland
Copyright: Fred Kruijen; Contribution: Hg
Location: Deutschland/Rheinland-Pfalz/Mayen-Koblenz-Kreis/Mendig, Verbandsgemeinde/In den Dellen (Grube Zieglowski)
Mineral: Biotite
Image: 1266790144
Rating: 9.64 (votes: 11)
License: Usage for Mineralienatlas project only
Biotit

Bildbreite: 2 mm; Fundort: In den Dellen (Bimsgrube Zieglowski), Mendig, Eifel, Deutschland
Copyright: Fred Kruijen
Contribution: Hg 2010-02-21
Locality: In den Dellen (Grube Zieglowski) / Mendig, Verbandsgemeinde / Mayen-Koblenz-Kreis / Rheinland-Pfalz / Deutschland
Biotit
Views (File:
1291815157
): 23185, Rating: 9.8
Biotit
Größe: 0,65 mm, Fundort: Nickenicher Sattel, Nickenich, Eifel, Rheinland-Pfalz, Deutschland
Copyright: Matteo Chinellato; Contribution: Hg
Location: Deutschland/Rheinland-Pfalz/Mayen-Koblenz-Kreis/Pellenz, Verbandsgemeinde/Nickenich/Nickenicher Sattel (Eicher Sattel)
Mineral: Biotite
Image: 1291815157
Rating: 9.8 (votes: 5)
License: Usage for Mineralienatlas project only
Biotit

Größe: 0,65 mm, Fundort: Nickenicher Sattel, Nickenich, Eifel, Rheinland-Pfalz, Deutschland
Copyright: Matteo Chinellato
Contribution: Hg 2010-12-08
Locality: Nickenicher Sattel (Eicher Sattel) / Nickenich / Pellenz, Verbandsgemeinde / Mayen-Koblenz-Kreis / Rheinland-Pfalz / Deutschland
Biotit
Views (File:
1303643013
): 19280, Rating: 10
Biotit
Größe: 1,26 mm; Fundort: Monte Somma, Somma-Vesuv-Komplex, Neapel, Kampanien (Campania), Italien
Copyright: Matteo Chinellato; Contribution: Hg
Location: Italien/Kampanien (Campania), Region/Metropolitanstadt Neapel/Somma-Vesuv-Komplex/Monte Somma
Mineral: Biotite
Image: 1303643013
Rating: 10 (votes: 4)
License: Usage for Mineralienatlas project only
Biotit

Größe: 1,26 mm; Fundort: Monte Somma, Somma-Vesuv-Komplex, Neapel, Kampanien (Campania), Italien
Copyright: Matteo Chinellato
Contribution: Hg 2011-04-24
Locality: Monte Somma / Somma-Vesuv-Komplex / Metropolitanstadt Neapel / Kampanien (Campania), Region / Italien
Biotit, Magnetit
Views (File:
1742667895
): 27
Biotit, Magnetit
Fundstelle: In den Dellen, Olympus E-M5II, Stonemaster StackUnit, Objektiv: Mitutoyo 10x, Bildbreite 1,5 mm
Copyright: Hartmut Stöckle; Contribution: Hartmut Stöckle
Collection: Hartmut Stöckle
Location: Deutschland/Rheinland-Pfalz/Mayen-Koblenz-Kreis/Mendig, Verbandsgemeinde/In den Dellen (Grube Zieglowski)
Mineral: Biotite
Image: 1742667895
Rating: 10 (votes: 3)
License: Creative Commons - Attribution-Noncommercial (CC-BY-NC) V.3.0
Biotit, Magnetit  D

Fundstelle: In den Dellen, Olympus E-M5II, Stonemaster StackUnit, Objektiv: Mitutoyo 10x, Bildbreite 1,5 mm
Collection: Hartmut Stöckle
Copyright: Hartmut Stöckle
Contribution: Hartmut Stöckle 2025-03-22
Locality: In den Dellen (Grube Zieglowski) / Mendig, Verbandsgemeinde / Mayen-Koblenz-Kreis / Rheinland-Pfalz / Deutschland
Biotit
Views (File:
1303642931
): 16201
Biotit
Größe: 1,06 mm; Fundort: Monte Somma, Somma-Vesuv-Komplex, Neapel, Kampanien (Campania), Italien
Copyright: Matteo Chinellato; Contribution: Hg
Location: Italien/Kampanien (Campania), Region/Metropolitanstadt Neapel/Somma-Vesuv-Komplex/Monte Somma
Mineral: Biotite
Image: 1303642931
Rating: 10 (votes: 2)
License: Usage for Mineralienatlas project only
Biotit

Größe: 1,06 mm; Fundort: Monte Somma, Somma-Vesuv-Komplex, Neapel, Kampanien (Campania), Italien
Copyright: Matteo Chinellato
Contribution: Hg 2011-04-24
Locality: Monte Somma / Somma-Vesuv-Komplex / Metropolitanstadt Neapel / Kampanien (Campania), Region / Italien

You find additional specimen at the Geolitho Museum

Collectors Summary

Color schwarz, dunkelbraun, grünlichschwarz
Streak color weiß, grauweiß
Lustre Glasglanz
Hardness (Mohs) 2 - 3
Cleavages vollkommen nach der Basis
Crystal System monoklin, C2/m
Morphology monoklin, tafelig oder kurzprismatische, pseudohexagonale Prismen, auch blättrige Aggregate und verstreute Blättchen

Additional information / Summary

Dunkler Glimmer ohne Lithium. Von der IMA nicht mehr als eigenständiges Mineral anerkannter Mischkristall der Reihe Annit-Phlogopit (incl. der Fluoro- und Oxo-Arten). Sollte als Sammelbezeichnung für alle nicht analysierten dunklen Glimmer verwendet werden.

Chemism

Chemical formula

K(Mg,Fe2+)3(Si3Al)O10(OH,F)2

Chemical composition

Aluminium, Eisen, Magnesium, Silicium, Fluor, Kalium, Sauerstoff, Wasserstoff

Unit weight: 441.911290325 u; Number of atoms in the formula: 21.5

Info

Empirical formula:

K(Mg0.75Fe0.25)3(Si3Al)O10((OH)0.75F0.25)2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.34

1.5

6.98

1.0079470

1.5119205
Oxygen

O

41.64

11.5

53.49

15.9994300

183.9934450
Fluorine

F

2.15

0.5

2.33

18.9984033

9.4992016
Magnesium

Mg

12.37

2.25

10.47

24.3050600

54.6863850
Aluminium

Al

6.11

1

4.65

26.9815382

26.9815382
Silicon

Si

19.07

3

13.95

28.0855300

84.2565900
Potassium

K

8.85

1

4.65

39.0983100

39.0983100
Iron

Fe

9.48

0.75

3.49

55.8452000

41.8839000

Strunz 9th edition incl. updates

9.EC.20

9: Silikate (Germanate)
E: Schichtsilikate (Phyllosilikate)
C: Schichtsilikate (Phyllosilikate) mit Glimmer Tafeln, zusammengesetzt aus tetrahedralen oder octahedralen Netzen
20:Phlogopit-Gruppe

IMA status

Seit 1999 nicht mehr als eigenständiges Mineral anerkannt

Mineral status

Gemenge/Gemisch/Mischkristall

Optical Properties

Color

schwarz, dunkelbraun, grünlichschwarz

Streak color

weiß, grauweiß

Lustre

Glasglanz

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

12

Space Group

C2/m

Cell parameters α

90°

Cell parameters γ

90°

Z

2

X-Ray Powder Diffraction

10.1(100),
3.36(100),
2.65(80),
2.450(80),
2.183(80),
2.002(80),
1.672(80),
1.551(80)
XRD chart Biotite

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

Morphology

monoklin, tafelig oder kurzprismatische, pseudohexagonale Prismen, auch blättrige Aggregate und verstreute Blättchen

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

2 - 3

Density (g/cm³)

2.7 - 3.3

Cleavages

vollkommen nach der Basis

Preface

Occurrences

In Graniten, Syeniten und Dioriten sowie in feinkörnigen Äquivalenten. In Schiefer, Gneisen und kontaktmetamorphen Gesteinen ist er regelmäßiger Bestandteil.

Name from

dem franz. Physiker J.B. Biot (1774-1862)

Author (Name, Year)

Hausmann, 1874

Additional Information

Biotit ist benannt nach dem französischen Chemiker J.B. Biot (Anfang 19. Jhdt.).

References

Canadian Mineralogist 36 (1998), 905.

Karel Breiter, Michaela Vaňková, Michaela Vašinová Galiová, Zuzana Korbelová, Viktor Kanický: Lithium and trace-element concentrations in trioctahedral micas from granites of different geochemical types measured via laser ablation ICP-MS. Mineralogical Magazine, Jhrg. 81, Nr. 1 (2017) S. 15-33.

Varieties

Oxybiotite

vermutlich oxidierter Biotit

Rubellan

Other languages

Dutch

Biotiet

Estonian

Biotiit

Finnish

Biotiitti

German

Biotit

Spanish

Biotita

Lithuanian

Biotitas

French

Biotite

English

Biotite

Polish

Biotyt

Turkish

Biyotit

Russian

Биотит

Serbian (Cyrillic Script)

Биотит

Ukrainian

Біотит

Russian

Лепидомелан

Hebrew

ביוטיט

Japanese

黒雲母

Korean

흑운모

Alternative Name

German

Biotit-Ober-Gruppe

Biotite-Phlogopite Series

Black Mica

German

Hydroxylbiotit

Spanish

Hydroxylbiotita

Hydroxylbiotite

English

Ironmica

Lepidomelan

English

Lepidomelane

Manganoan Biotite

German

Manganophyllit

Spanish

Manganophyllita

English

Manganophyllite

Meroxen

Meroxene

German

Odenit

Spanish

Odenita

Odenite

German

Oderit

Spanish

Oderita

Oderite

German

Odit

Spanish

Odita

Odite

German

Rhombenglimmer

Simplified Chinese

黑云母

CNMNC symbol

Symbol

Bt

Rock part of

 
Rocks

 
 
igneous rocks and sediments

 
 
 
crystalline igneous rocks

 
 
 
 
exotic crystalline rocks

 
 
 
 
 
melilitic rock

 
 
 
 
 
 
ultramafic-melilitic-rock

 
 
 
 
 
 
 
coarse-grained ultramafic-melilitic-rock

 
 
 
 
 
 
 
 
biotite-nepheline-melilitolit  

 
 
 
 
normal crystalline rocks

 
 
 
 
 
coarse-grained crystalline rocks

 
 
 
 
 
 
anorthositic-rock

 
 
 
 
 
 
 
anorthosite  

 
 
 
 
 
 
dioritic-rock

 
 
 
 
 
 
 
diorite

 
 
 
 
 
 
 
 
esboite  

 
 
 
 
 
 
 
 
orbicular diorite  

 
 
 
 
 
 
 
quartz-monzodiorite

 
 
 
 
 
 
 
 
cizlakite  

 
 
 
 
 
 
foid-syenitic-rock

 
 
 
 
 
 
 
foid-syenite

 
 
 
 
 
 
 
 
shonkinite  

 
 
 
 
 
 
gabbroic-rock

 
 
 
 
 
 
 
quartz-monzogabbro

 
 
 
 
 
 
 
 
cizlakite  

 
 
 
 
 
 
granitic-rock

 
 
 
 
 
 
 
alkali-feldspar-granite

 
 
 
 
 
 
 
 
peralkaline alkali-feldspar-granite

 
 
 
 
 
 
 
 
 
ekerite  

 
 
 
 
 
 
syenitic-rock

 
 
 
 
 
 
 
foid-bearing alkali-feldspar-syenite  

 
 
 
 
 
 
 
syenite  

 
 
 
 
 
 
 
 
Durbachite  

 
 
 
 
 
fine-grained crystalline rocks

 
 
 
 
 
 
andesitic-rock

 
 
 
 
 
 
 
andesite

 
 
 
 
 
 
 
 
boninite  

 
 
 
 
 
 
 
basaltic andesite

 
 
 
 
 
 
 
 
boninite  

 
 
 
 
 
 
dacitic-rock

 
 
 
 
 
 
 
dacite  

 
 
 
 
 
 
trachytic-rock

 
 
 
 
 
 
 
basaltic trachyandesite

 
 
 
 
 
 
 
 
absarokite  

 
 
 
 
 
 
 
trachyandesite

 
 
 
 
 
 
 
 
banakite  

 
 
 
 
 
 
 
trachyte  

 
 
metamorphic rocks and metasediments

 
 
 
foliated metamorphic rock

 
 
 
 
non-mylonitic foliated metamorphic rock

 
 
 
 
 
schistose rock

 
 
 
 
 
 
schist

 
 
 
 
 
 
 
mica schist

 
 
 
 
 
 
 
 
garnet mica schist

 
 
 
 
 
 
 
 
 
disthene garnet mica schist

 
 
 
 
 
 
 
 
 
 
radentheinite  

 
 
 
high-grade metamorphic rock

 
 
 
 
amphibolite  

 
 
 
meta-igneous rock

 
 
 
 
meta-crystalline igneous rocks

 
 
 
 
 
meta-normal crystalline rocks

 
 
 
 
 
 
meta-coarse-grained crystalline rocks

 
 
 
 
 
 
 
meta-gabbroic-rock

 
 
 
 
 
 
 
 
metagabbro  

 
 
 
rock names based on modal composition of metamorphic rocks

 
 
 
 
ferromagnesian metamorphic rocks

 
 
 
 
 
mafic metamorphic rocks

 
 
 
 
 
 
amphibolite  

Refresh list | View legend

Hint

- Essential mineral - Important for the classification of the rock.
- Accessory or non-essential mineral - this minerals are common, sometimes major part of, but are not always present.

Actuality: 18. Apr 2025 - 13:12:03

Locations with GPS information

IDs

GUSID (Global unique identifier short form) aAIJ6DiVjUC06T6Skf9uWQ
GUID (Global unique identifier) E8090268-9538-408D-B4E9-3E9291FF6E59
Database ID 401