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Microsommite

Pictures (7 Images total)

Mikrosommit
Views (File:
1315299841
): 1617
Mikrosommit
Größe: 2,6 mm; Fundort: Pollena-Trocchia, Monte Somma, Somma-Vesuv-Komplex, Neapel, Kampanien (Campania), Italien
Copyright: Matteo Chinellato; Contribution: Hg
Collection: Domenico Preite
Location: Italien/Kampanien (Campania), Region/Metropolitanstadt Neapel/Somma-Vesuv-Komplex/Monte Somma/Pollena-Trocchia
Mineral: Microsommite
Image: 1315299841
Rating: 9.5 (votes: 2)
License: Usage for Mineralienatlas project only
Mikrosommit

Größe: 2,6 mm; Fundort: Pollena-Trocchia, Monte Somma, Somma-Vesuv-Komplex, Neapel, Kampanien (Campania), Italien
Collection: Domenico Preite
Copyright: Matteo Chinellato
Contribution: Hg 2011-09-06
Locality: Pollena-Trocchia / Monte Somma / Somma-Vesuv-Komplex / Metropolitanstadt Neapel / Kampanien (Campania), Region / Italien
Mikrosommit
Views (File:
1315299794
): 1101
Mikrosommit
Größe: 1,06 mm; Fundort: Pollena-Trocchia, Monte Somma, Somma-Vesuv-Komplex, Neapel, Kampanien (Campania), Italien
Copyright: Matteo Chinellato; Contribution: Hg
Collection: Domenico Preite
Location: Italien/Kampanien (Campania), Region/Metropolitanstadt Neapel/Somma-Vesuv-Komplex/Monte Somma/Pollena-Trocchia
Mineral: Microsommite
Image: 1315299794
Rating: 7.5 (votes: 2)
License: Usage for Mineralienatlas project only
Mikrosommit

Größe: 1,06 mm; Fundort: Pollena-Trocchia, Monte Somma, Somma-Vesuv-Komplex, Neapel, Kampanien (Campania), Italien
Collection: Domenico Preite
Copyright: Matteo Chinellato
Contribution: Hg 2011-09-06
Locality: Pollena-Trocchia / Monte Somma / Somma-Vesuv-Komplex / Metropolitanstadt Neapel / Kampanien (Campania), Region / Italien
Mikrosommit
Views (File:
1245612706
): 1076
Mikrosommit
Bildbreite: 3 mm; Fundort: Monte Somma, Somma-Vesuv-Komplex, Neapel, Kampanien (Campania), Italien
Copyright: Stephan Wolfsried; Contribution: Hg
Location: Italien/Kampanien (Campania), Region/Metropolitanstadt Neapel/Somma-Vesuv-Komplex/Monte Somma
Mineral: Microsommite
Image: 1245612706
Rating: 8 (votes: 1)
License: Usage for Mineralienatlas project only
Mikrosommit

Bildbreite: 3 mm; Fundort: Monte Somma, Somma-Vesuv-Komplex, Neapel, Kampanien (Campania), Italien
Copyright: Stephan Wolfsried
Contribution: Hg 2009-06-21
Locality: Monte Somma / Somma-Vesuv-Komplex / Metropolitanstadt Neapel / Kampanien (Campania), Region / Italien
Mikrosommit
Views (File:
1245612665
): 938
Mikrosommit
Bildbreite: 3 mm; Fundort: Monte Somma, Somma-Vesuv-Komplex, Neapel, Kampanien (Campania), Italien
Copyright: Stephan Wolfsried; Contribution: Hg
Location: Italien/Kampanien (Campania), Region/Metropolitanstadt Neapel/Somma-Vesuv-Komplex/Monte Somma
Mineral: Microsommite
Image: 1245612665
Rating: 7 (votes: 1)
License: Usage for Mineralienatlas project only
Mikrosommit

Bildbreite: 3 mm; Fundort: Monte Somma, Somma-Vesuv-Komplex, Neapel, Kampanien (Campania), Italien
Copyright: Stephan Wolfsried
Contribution: Hg 2009-06-21
Locality: Monte Somma / Somma-Vesuv-Komplex / Metropolitanstadt Neapel / Kampanien (Campania), Region / Italien
prismatisch blockige farblose Mikrosommite
Views (File:
1608976936
): 157
prismatisch blockige farblose Mikrosommite
Italien/Kampanien (Campania), Region/Neapel, Provinz/Somma-Vesuv-Komplex/Monte Somma, BB = 2,0 mm
Copyright: Hannes Osterhammer; Contribution: Münchener Micromounter
Collection: Lithothek der Münchener Micromounter, Collection number: B007857, Donator: anatase2
Location: Italien/Kampanien (Campania), Region/Metropolitanstadt Neapel/Somma-Vesuv-Komplex/Monte Somma
Mineral: Microsommite
Image: 1608976936
License: Usage for Mineralienatlas project only
prismatisch blockige farblose Mikrosommite (SNr: B007857)

Italien/Kampanien (Campania), Region/Neapel, Provinz/Somma-Vesuv-Komplex/Monte Somma, BB = 2,0 mm
Collection: Lithothek der Münchener Micromounter
Copyright: Hannes Osterhammer
Contribution: Münchener Micromounter 2020-12-26
Locality: Monte Somma / Somma-Vesuv-Komplex / Metropolitanstadt Neapel / Kampanien (Campania), Region / Italien

You find additional specimen at the Geolitho Museum

Collectors Summary

Color farblos, weiß
Streak color weiß
Hardness (Mohs) 5.5
Solubility +++ Säuren
Crystal System hexagonal, P63

Chemism

Chemical formula

(Na,Ca,K)7-8(Si,Al)12O24(Cl,SO4,CO3)2-3

Chemical composition

Aluminium, Calcium, Chlor, Natrium, Silicium, Kalium, Kohlenstoff, Sauerstoff, Schwefel

Unit weight: 1080.8842855 u; Number of atoms in the formula: 49.75

Info

Empirical formula:

(Na0.6Ca0.3K0.1)7.5(Si0.75Al0.25)12O24(Cl0.6(SO4)0.3(CO3)0.1)2.5

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Carbon

C

0.28

0.25

0.50

12.0107800

3.0026950
Oxygen

O

41.08

27.75

55.78

15.9994300

443.9841825
Sodium

Na

9.57

4.5

9.05

22.9897702

103.4539659
Aluminium

Al

7.49

3

6.03

26.9815382

80.9446146
Silicon

Si

23.39

9

18.09

28.0855300

252.7697700
Sulfur

S

2.22

0.75

1.51

32.0655000

24.0491250
Chlorine

Cl

4.92

1.5

3.02

35.4532000

53.1798000
Potassium

K

2.71

0.75

1.51

39.0983100

29.3237325
Calcium

Ca

8.34

2.25

4.52

40.0784000

90.1764000

Analysis wt%

SiO2 : 32.21, Al2O3 : 28.52, CaO : 10.53, Na2O : 11.20, K2O : 7.13, Cl : 7.04, SO3 : 3.94, CO2 : 1.42 (Ref: Hintze, Handbuch der Mineralogie, 1904-1974)

Strunz 9th edition incl. updates

9.FB.05

9: Silikate (Germanate)
F: Gerüstsilikate (Tektosilikate) ohne zeolithisches H2O
B: Gerüstsilikate (Tektosilicates) mit weiteren [Anionen]
05:Cancrinit-Gruppe

Lapis Classification

VIII/J.09-030

VIII: SILIKATE
J: Gerüstsilikate (mit Zeolithen)
9: Mit tetraederfremden Anionen; Cancrinit-Gruppe

Classification by Hölzel

9.FE.300

9: SILICATES
F: Tektosilicates
E: Hexagonal or trigonal with other Anions
3: Microsommite-Group - hexagonal, axis for a~~23A and c~~5A

Dana 8th edition

76.02.05.10

76: Tektosilicates Tectosilicate Al-Si Framework
02: Tektosilicates Tectosilicate Al-Si Framework Feldspathoids and related species
05: Cancrinite group

IMA status

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

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Cancrinit–Sodalit supergroup  ⇒ Cancrinite Group  ⇒ Davyne Subgroup

Optical Properties

Color

farblos, weiß

Streak color

weiß

Diaphaneity (Transparency)

transparent

max. Birefringence

0.008
Birefringence chart\! Microsommite title=Birefringence chart Microsommite

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

1.521

RI value γ / ε

1.529

Ri mean

1.524

2V angle

Uniaxial (+)

Crystallography

Crystal System

hexagonal

Class (H-M)

6

Space Group number

173

Space Group

P63

Cell parameters a (Å)

22.08

Cell parameters b (Å)

-

Cell parameters c (Å)

5.33

Cell parameters a/b or c/a

0.241

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

120°

Z

3

Volume (ų)

2250.381

X-Ray Powder Diffraction

4.81(100),
3.690(100),
3.294(100),
2.765(80),
2.670(90),
2.660(90),
2.455(80),
2.128(80)
XRD chart Microsommite

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

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

5.5

VHN (Hardness Vickers)

530 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.42 - 2.53 / Durchschnittlich = 2.47

2.393 ( ρ calc. Mineralienatlas )

Instability

+++ Säuren

Preface

Author (Name, Year)

Scacchi, 1872

References

Handbook of Mineralogy (Anthony et al.), 2 (1995), 540

IMA group assignments

Names

Acantoïd

Doelter IV.3, 1103 (1931); II.2, 263

Other languages

Spanish

Microsommita

French

Microsommite

English

Microsommite

German

Mikrosommit

Russian

Микросоммит

Alternative Name

Acanthoïde

Mg-reicher Vonsenit oder Mikrosommit; Chester 1 (1896); Lacroix 97 (1931)

German

Microsommit

Mikrosommite

CNMNC symbol

Symbol

Msm

Locations with GPS information

IDs

GUSID (Global unique identifier short form) BczkXyDGkUqeSMa9S_nThg
GUID (Global unique identifier) 5FE4CC05-C620-4A91-9E48-C6BD4BF9D386
Database ID 2535