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Avogadrite (Avogadrit)

Pictures (1 Images total)

Avogadrit
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Avogadrit
hellbraunes derbes Stück von der Typlokalität aus der Eruption von 1926; BB = 11 mm
Copyright: Hannes Osterhammer; Contribution: Münchener Micromounter
Collection: Lithothek der Münchener Micromounter, Collection number: A003694, Donator: Klaus Fleck
Location: Italien/Kampanien (Campania), Region/Neapel, Provinz/Somma-Vesuv-Komplex/Vesuv/Atrio del Cavallo
Mineral: Avogadrite
Image: 1442060012
License: Usage for Mineralienatlas project only
Avogadrit (SNr: A003694)

hellbraunes derbes Stück von der Typlokalität aus der Eruption von 1926; BB = 11 mm
Collection: Lithothek der Münchener Micromounter
Copyright: Hannes Osterhammer
Contribution: Münchener Micromounter 2015-09-12
Locality: Atrio del Cavallo / Vesuv / Somma-Vesuv-Komplex / Neapel, Provinz / Kampanien (Campania), Region / Italien

You find additional Avogadrit specimen at the Geolitho Museum

Collectors Summary

Color farblos, weiß, gelblich, rötlich
Streak color farblos
Solubility + H2O
Crystal System orthorhombisch, Pnma

Chemism

Chemical formula

KBF4

Chemical composition

Bor, Fluor, Kalium

Unit weight: 125.903623 u; Number of atoms in the formula: 6

Info

Empirical formula:

KBF4

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Boron

B

8.59

1

16.67

10.8117000

10.8117000
Fluorine

F

60.36

4

66.67

18.9984033

75.9936130
Potassium

K

31.05

1

16.67

39.0983100

39.0983100

Strunz 9th edition incl. updates

3.CA.10

3: Halide (Fluoride, Chloride, Bromide, Iodide)
C: Komplexe Halogenide
A: Borofluoride
10:Avogadrit-Gruppe

Lapis Classification

III/B.01-020

III: HALOGENIDE (Fluoride, Chloride, Bromide, Jodide)
B: Doppelhalogenide
1: mit [BF4] 1-, [SiF6] 2- und [AlF6] 3-

Classification by Hölzel

3.DC.110

3: HALIDES
D: Complex Halides
C: Boro und Silico-Fluorides
1: Boro-Fluoride-Group

Dana 8th edition

11.02.02.01

11: Halide Complexes; Alumino-fluorides
02: Halide Complexes; Alumino-fluorides where (A)m B (X)4

IMA status

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

Mineral status

anerkanntes Mineral

Optical Properties

Color

farblos, weiß, gelblich, rötlich

Streak color

farblos

Diaphaneity (Transparency)

transparent

max. Birefringence

0.001
Birefringence chart\! Avogadrite title=Birefringence chart Avogadrite

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

1.324

RI value β

1.325

RI value γ / ε

1.325

Ri mean

1.325

2V angle

Biaxial (-) v.lg

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mmm

Space Group number

62

Space Group

Pnma

Cell parameters a (Å)

8.664

Cell parameters b (Å)

5.480

Cell parameters c (Å)

7.028

Cell parameters a/b or c/a

1.581

Cell parameters c/b

1.282

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

4

Volumne (ų)

333.68

X-Ray Powder Diffraction

3.51(40),
3.41(100),
3.26(80),
3.06(70),
2.801(40),
2.230(20),
2.091(30),
2.068(50)
XRD chart Avogadrite

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)

2.62

2.506 ( ρ calc. Mineralienatlas )

Instability

+ H2O

(Co-)Type locality

(Co-)Type locality

Italien/Kampanien (Campania), Region/Neapel, Provinz/Somma-Vesuv-Komplex/Vesuv

Preface

Author (Name, Year)

Zambonini, 1926

References

Handbook of Mineralogy (Anthony et al.), 3 (1997), 32

Other languages

German

Avogadrit

Spanish

Avogadrita

French

Avogadrite

English

Avogadrite

Russian

Авогадрит

Alternative Name

German

Avogadroit

CNMNC symbol

Symbol

Avg

Locations with GPS information