Microsommite
A valid IMA mineral species - grandfathered
This page is currently not sponsored. Click here to sponsor this page.
About Microsommite
Formula:
Na4K2Ca2(Al6Si6O24)(SO4)Cl2
Colour:
colourless, white
Lustre:
Silky
Hardness:
6
Specific Gravity:
2.42 - 2.53
Crystal System:
Hexagonal
Member of:
Name:
Named in 1872 by A. Scacchi. Name derived from 'micro' for the small crystal size and the type locality of Monte Somma, Italy.
Unique Identifiers
Mindat ID:
2706
Long-form identifier:
mindat:1:1:2706:5
GUID
(UUID V4):
(UUID V4):
47b01e1c-7ca9-4a53-9815-4c088434a7d9
IMA Classification of Microsommite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
[(Na,K)6(SO4)][Ca2Cl2][(Si6Al6O24)]
Classification of Microsommite
9.FB.05
9 : SILICATES (Germanates)
F : Tektosilicates without zeolitic H2O
B : Tektosilicates with additional anions
9 : SILICATES (Germanates)
F : Tektosilicates without zeolitic H2O
B : Tektosilicates with additional anions
76.2.5.10
76 : TECTOSILICATES Al-Si Framework
2 : Al-Si Framework Feldspathoids and related species
76 : TECTOSILICATES Al-Si Framework
2 : Al-Si Framework Feldspathoids and related species
17.10.8
17 : Silicates Containing other Anions
10 : Silicates with sulphate, molybdate or tungstate
17 : Silicates Containing other Anions
10 : Silicates with sulphate, molybdate or tungstate
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Msm | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Microsommite
Silky
Transparency:
Transparent
Comment:
Silky to brilliant on {1010}
Colour:
colourless, white
Streak:
white
Hardness:
6 on Mohs scale
Cleavage:
Perfect
{1010}, perfect; {0001}, less distinct
{1010}, perfect; {0001}, less distinct
Density:
2.42 - 2.53 g/cm3 (Measured) 2.48 g/cm3 (Calculated)
Optical Data of Microsommite
Type:
Uniaxial (+)
RI values:
nω = 1.521 nε = 1.529
Max Birefringence:
δ = 0.008
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Low
Chemistry of Microsommite
Mindat Formula:
Na4K2Ca2(Al6Si6O24)(SO4)Cl2
Crystallography of Microsommite
Crystal System:
Hexagonal
Class (H-M):
6 2 2 - Trapezohedral
Space Group:
P63 2 2
Cell Parameters:
a = 22.08(4) Å, c = 5.33(2) Å
Ratio:
a:c = 1 : 0.241
Unit Cell V:
2,250.38 ų (Calculated from Unit Cell)
Z:
3
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Display Options
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
View
CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
Stop | Start
Stop | Start
Labels
Console Off | On | Grey | Yellow
Console Off | On | Grey | Yellow
Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0007925 | Microsommite | Bonaccorsi E, Comodi P, Merlino S (1995) Thermal behaviour of davyne-group minerals Physics and Chemistry of Minerals 22 367-374 | 1995 | 0 | 293 | ||
0007926 | Microsommite | Bonaccorsi E, Comodi P, Merlino S (1995) Thermal behaviour of davyne-group minerals Physics and Chemistry of Minerals 22 367-374 | 1995 | 0 | 293 | ||
0008599 | Microsommite | Bonaccorsi E, Merlino S, Pasero M, Macedonio G (2001) Microsommite: crystal chemistry, phase transitions, Ising model and Monte Carlo simulations Physics and Chemistry of Minerals 28 509-522 | 2001 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
4.81 Å | (100) |
3.69 Å | (100) |
3.29 Å | (100) |
2.670 Å | (80) |
2.660 Å | (80) |
2.765 Å | (60) |
2.455 Å | (60) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
High-𝑇 alteration and/or metamorphism | |
31 : Thermally altered carbonate, phosphate, and iron formations | |
Stage 4b: Highly evolved igneous rocks | >3.0 |
35 : Ultra-alkali and agpaitic igneous rocks |
Type Occurrence of Microsommite
Place of Conservation of Type Material:
Natural History Museum, Paris, France, 97397
Geological Setting of Type Material:
ejected volcanic masses and in leucitites.
Associated Minerals at Type Locality:
Reference:
Scacchi, A. (1872) Notizie preliminari di alcune specie mineralogiche rinvenute nel Vesuvio dopo l'incendio di aprile 1872. Rendiconto dell'Accademia delle Scienze Fisiche e Matematiche (sezione della Società reale di Napoli): 11: 210-213.
Synonyms of Microsommite
Other Language Names for Microsommite
Relationship of Microsommite to other Species
Member of:
Other Members of this group:
Afghanite | (Na,K)22Ca10(Si24Al24O96)(SO4)6Cl6 | Trig. 3m : P3 1c |
Alloriite | (Na,Ca,K)26Ca4(Al6Si6O24)4(SO4)6Cl6 | Trig. 3m : P3 1c |
Balliranoite | (Na,K)6Ca2(Si6Al6O24)Cl2(CO3) | Hex. 6 : P63 |
Betzite | Na6Ca2(Al6Si6O24)Cl4 | Hex. 6 : P63 |
Biachellaite | (Na,Ca,K)8(Al6Si6O24)(SO4)2(OH)0.5 · H2O | Trig. 3 : P3 |
Bystrite | (Na,K)7Ca(Al6Si6O24)(S5)Cl | Trig. 3m : P3 1c |
Cancrinite | (Na,Ca,◻)8(Al6Si6O24)(CO3,SO4)2 · 2H2O | Hex. 6 : P63 |
Cancrisilite | Na7(Al5Si7O24)(CO3) · 3H2O | Hex. 6mm : P63mc |
Carbobystrite | Na8(Al6Si6O24)(CO3) · 3.5H2O | Trig. 3m : P3 1c |
Davyne | (Na,K)6Ca2(Al6Si6O24)(Cl2,SO4)2 | Hex. 6/m : P63/m |
Depmeierite | Na8(Al6Si6O24)(PO4,CO3)1-x · 3H2O (x | Hex. 6 : P63 |
Fantappièite | [Na82.5Ca33K16.5](Si99Al99O396)(SO4)33 · 4H2O | Trig. 3 : R3 |
Farneseite | (Na,Ca,K)56(Al6Si6O24)7(SO4)12 · 6H2O | Hex. 6/m : P63/m |
Franzinite | (Na,K)6Ca2(Al6Si6O24)(SO4)2 · 0.5H2O | Hex. |
Giuseppettite | (Na,K,Ca)7-8(Al6Si6O24)(SO4,Cl)1-2 | Trig. 3m : P3 1c |
Hydroxycancrinite | Na8(Al6Si6O24)(OH)2 · 2H2O | Hex. 6 : P63 |
Kircherite | Na5Ca2K(Al6Si6O24)(SO4)2 · 0.33H2O | Trig. 3 2 : R3 2 |
Kyanoxalite | Na7(Al6-xSi6+xO24)(C2O4)0.5+x · 5H2O (0 < x < 0.5) | Hex. 6 : P63 |
Liottite | (Na,K)16Ca8(Al6Si6O24)3(SO4)5Cl4 | Hex. 6 : P6 |
Marinellite | (Na,K)42Ca6(Al6Si6O24)6(SO4)8Cl2 · 3H2O | Trig. 3m : P3 1c |
Pitiglianoite | Na6K2(Al6Si6O24)(SO4) · 2H2O | Hex. 6 : P63 |
Quadridavyne | (Na,K)6Ca2(Al6Si6O24)Cl4 | Hex. 6/m : P63/m |
Sacrofanite | (Na61K19Ca32)(Si84Al84O336)(SO4)26Cl2F6 · 2H2O | Hex. |
Slyudyankaite | Na28Ca4(Si24Al24O96)(SO4)6(S6)1/3(CO2) · 2H2O | Tric. 1 : P1 |
Steudelite | Na3(K17Ca7)Ca4(Al24Si24O96)(SO3)6F6 · 4H2O | Hex. 6 m2 : P62c |
Sulfhydrylbystrite | Na5K2Ca[Al6Si6O24](S5)2(SH) | Trig. 3m : P3 1c |
Tounkite | (Na,Ca,K)8(Al6Si6O24)(SO4)2Cl · H2O | Hex. 6 2 2 : P62 2 2 |
UM2004-48-SiO:AlClCaNaS | (Na,Ca)8(Si6Al6)O24(SO4)1.7Cl1.3 | |
UM2009-23-SiO:AlCCaClHKNaS | (Na,Ca)24K10[(Si,Al)60O120](SO4)5.6Cl1.5(CO3)0.4 · 11H2O | Trig. 3 : P3 |
Vishnevite | (Na,K)8(Al6Si6O24)(SO4,CO3) · 2H2O | Hex. 6 : P63 |
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
9.FB. | Steudelite | Na3(K17Ca7)Ca4(Al24Si24O96)(SO3)6F6 · 4H2O |
9.FB. | Sapozhnikovite | Na8(Al6Si6O24)(HS)2 |
9.FB. | Betzite | Na6Ca2(Al6Si6O24)Cl4 |
9.FB. | Slyudyankaite | Na28Ca4(Si24Al24O96)(SO4)6(S6)1/3(CO2) · 2H2O |
9.FB. | Bolotinaite | (Na7◻)(Al6Si6O24)F · 4H2O |
9.FB. | Wenlanzhangite-(Y) | Y2V3+2V4+2(SiO4)2O4(OH)4 |
9.FB.05 | Afghanite | (Na,K)22Ca10(Si24Al24O96)(SO4)6Cl6 |
9.FB.05 | Bystrite | (Na,K)7Ca(Al6Si6O24)(S5)Cl |
9.FB.05 | Cancrinite | (Na,Ca,◻)8(Al6Si6O24)(CO3,SO4)2 · 2H2O |
9.FB.05 | Cancrisilite | Na7(Al5Si7O24)(CO3) · 3H2O |
9.FB.05 | Davyne | (Na,K)6Ca2(Al6Si6O24)(Cl2,SO4)2 |
9.FB.05 | Franzinite | (Na,K)6Ca2(Al6Si6O24)(SO4)2 · 0.5H2O |
9.FB.05 | Giuseppettite | (Na,K,Ca)7-8(Al6Si6O24)(SO4,Cl)1-2 |
9.FB.05 | Hydroxycancrinite | Na8(Al6Si6O24)(OH)2 · 2H2O |
9.FB.05 | Liottite | (Na,K)16Ca8(Al6Si6O24)3(SO4)5Cl4 |
9.FB.05 | Pitiglianoite | Na6K2(Al6Si6O24)(SO4) · 2H2O |
9.FB.05 | Quadridavyne | (Na,K)6Ca2(Al6Si6O24)Cl4 |
9.FB.05 | Sacrofanite | (Na61K19Ca32)(Si84Al84O336)(SO4)26Cl2F6 · 2H2O |
9.FB.05 | Tounkite | (Na,Ca,K)8(Al6Si6O24)(SO4)2Cl · H2O |
9.FB.05 | Vishnevite | (Na,K)8(Al6Si6O24)(SO4,CO3) · 2H2O |
9.FB.05 | Marinellite | (Na,K)42Ca6(Al6Si6O24)6(SO4)8Cl2 · 3H2O |
9.FB.05 | Farneseite | (Na,Ca,K)56(Al6Si6O24)7(SO4)12 · 6H2O |
9.FB.05 | Alloriite | (Na,Ca,K)26Ca4(Al6Si6O24)4(SO4)6Cl6 |
9.FB.05 | Biachellaite | (Na,Ca,K)8(Al6Si6O24)(SO4)2(OH)0.5 · H2O |
9.FB.05 | Fantappièite | [Na82.5Ca33K16.5](Si99Al99O396)(SO4)33 · 4H2O |
9.FB.05 | Kyanoxalite | Na7(Al6-xSi6+xO24)(C2O4)0.5+x · 5H2O (0 < x < 0.5) |
9.FB.05 | Balliranoite | (Na,K)6Ca2(Si6Al6O24)Cl2(CO3) |
9.FB.05 | Carbobystrite | Na8(Al6Si6O24)(CO3) · 3.5H2O |
9.FB.05 | Depmeierite | Na8(Al6Si6O24)(PO4,CO3)1-x · 3H2O (x |
9.FB.05 | Kircherite | Na5Ca2K(Al6Si6O24)(SO4)2 · 0.33H2O |
9.FB.05 | Sulfhydrylbystrite | Na5K2Ca[Al6Si6O24](S5)2(SH) |
9.FB.10 | Bicchulite | Ca2(Al2SiO6)(OH)2 |
9.FB.10 | Danalite | Be3Fe2+4(SiO4)3S |
9.FB.10 | Genthelvite | Be3Zn4(SiO4)3S |
9.FB.10 va | Hackmanite | Na8Al6Si6O24(Cl2,S) |
9.FB.10 | Haüyne | Na3Ca(Si3Al3)O12(SO4) |
9.FB.10 | Helvine | Be3Mn2+4(SiO4)3S |
9.FB.10 | Kamaishilite | Ca2(Al2SiO6)(OH)2 |
9.FB.10 | Lazurite | Na7Ca(Al6Si6O24)(SO4)(S3) · H2O |
9.FB.10 | Nosean | Na8(Al6Si6O24)(SO4) · H2O |
9.FB.10 | Sodalite | Na4(Si3Al3)O12Cl |
9.FB.10 | Tsaregorodtsevite | (N(CH3)4)(AlSi5O12) |
9.FB.10 | Tugtupite | Na4BeAlSi4O12Cl |
9.FB.10 | Vladimirivanovite | Na6Ca2(Al6Si6O24)(SO4,S3,S2,Cl)2 · H2O |
9.FB.15 | Marialite | Na4Al3Si9O24Cl |
9.FB.15 | Meionite | Ca4Al6Si6O24CO3 |
9.FB.15 | Silvialite | (Ca,Na)4(Al6Si6O24)(SO4,CO3) |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Microsommite
mindat.org URL:
https://www.mindat.org/min-2706.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Microsommite
Localities for Microsommite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
France | |
| Médard P. et al. (2009) |
Italy | |
| Knuever et al. (2023) |
| Mateo Chinelatto photo |
| M. Carati - Guida alla mineralogia ... |
Rath | |
| samples analysed by Dr. Tony Kampf +1 other reference |
| Scacchi (1881) +5 other references |
| Gentile P. (1985) +1 other reference |
Tajikistan | |
| Solovova et al. (2006, October) |
Quick NavTopAbout MicrosommiteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesRelationshipsCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Pollena quarries, Pollena Trocchia, Mount Somma, Somma-Vesuvius Complex, Naples, Campania, Italy