Microsommite  Mineral Data

Microsommite Mineral Data

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General Microsommite Information

Help on Chemical  Formula: Chemical Formula: (Na,Ca,K)7-8(Si,Al)12O24(Cl,SO4)2-3
Help on Composition: Composition: Molecular Weight = 1,086.58 gm
   Potassium   3.24 %  K     3.90 % K2O
   Sodium      8.89 %  Na   11.98 % Na2O
   Calcium     9.96 %  Ca   13.93 % CaO
   Aluminum   16.14 %  Al   30.50 % Al2O3
   Silicon    14.22 %  Si   30.41 % SiO2
   Sulfur      2.07 %  S     5.16 % SO3
   Chlorine    7.50 %  Cl    7.50 % Cl
                -   %   Cl   -1.69 % -O=Cl2   
   Oxygen     37.99 %  O
             ______        ______ 
             100.00 %      101.69 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na4.2Ca2.7K0.9Al6.5Si5.5O23Cl2.3(SO4)0.7
Help on Environment: Environment: In ejected volcanic masses and in leucitites.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1872
Help on Locality: Locality: Mte Somma, Vesuvius, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its locality.
Help on Name Pronunciation: Name Pronunciation: Microsommite + Pronunciation Say MICROSOMMITE
 

Microsommite Image

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Microsommite

Comments: Colorless prismatic microsommite microcrystals in vug.
Location: Novella Quarry, Vesuvius, Naples, Campania, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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Microsommite

Comments: White acycular microsommite crystals (one mm. long) in small vugs in matrix.
Location: Monte Somma - Vesuvio - NA, Campania, Italy. Scale: Picture size 1 cm.
© Sandro Maggia/Minernet.it

Microsommite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.24139
Help on Cell Dimensions: Cell Dimensions: a = 22.08, c = 5.33, Z = 3; V = 2,250.38 Den(Calc)= 2.41
Help on Crystal System: Crystal System: Hexagonal - TrapezohedralH-M Symbol (6 2 2) Space Group: P 6322
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.29(1), 3.69(1), 4.81(1),
Help on Forms: Forms:

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Forms: ( 1 1 1) ( 1 1 0) ( 0 1 0) ( 0 0 1)

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Click Here for Large Microsommite Structure Window Crystal Structure:

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Bonaccorsi E , Comodi P , Merlino S , Physics and Chemistry of Minerals , 22 (1995) p.367-374, Thermal behaviour of davyne-group minerals, Sample: T = 293 K

View Additional jPOWD Structure files for Microsommite
[1] [2]
 

Physical Properties of Microsommite

Help on Cleavage: Cleavage: {1010} Perfect, {0001} Distinct
Help on Color: Color: Colorless, White.
Help on Density: Density: 2.42 - 2.53, Average = 2.47
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Crystalline - Fine - Occurs as well-formed fine sized crystals.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Striated - Parallel lines on crystal surface or cleavage face.
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luster: Luster: Vitreous - Silky
Help on Streak: Streak: white
 

Optical Properties of Microsommite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.031 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.005 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2178,KPDmeas= 0.2121,KC= 0.2189
Ncalc = 1.53 - 1.55
Help on Optical Data: Optical Data: Uniaxial (+), w=1.521, e=1.529, bire=0.0080.
 

Calculated Properties of Microsommite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.38 gm/cc
note: Specific Gravity of Microsommite =2.41 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0071145823
Boson Index = 0.9928854177
Help on Photoelectric: Photoelectric: PEMicrosommite = 3.32 barns/electron
U=PEMicrosommite x relectron= 7.88 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 46.04 (Gamma Ray American Petroleum Institute Units)
Concentration of Microsommite per GRapi unit = 2.17 (%)

Estimated Radioactivity from Microsommite - barely detectable

 

Microsommite Classification

Help on  Dana Class: Dana Class: 76.02.05.10 (76)Tectosilicate Al-Si Framework
  (76.02)Feldspathoids and related species
  (76.02.05)Cancrinite group
 
76.02.05.01 Afghanite (Na,Ca,K)8(Si,Al)12O24(SO4,Cl,CO3)3•(H2O) P 63/mmc, P 63mc, or P 62c Hex
 
76.02.05.02 Bystrite (Na,K)7Ca(Si6Al6)O24S4.5•(H2O) P 31c 3m
 
76.02.05.03 Cancrinite Na6Ca2Al6Si6O24(CO3)2 P 63 6
 
76.02.05.04 Cancrisilite Na7Al5Si7O24(C03)•3(H2O) P 63 6
 
76.02.05.05 Davyne Na4K2Ca2Si6Al6O24(SO4)Cl2 P 63/m 6/m
 
76.02.05.06 Franzinite [(Na,K)30Ca10][Si30Al30O120](SO4)10•2(H2O) P 321 3 2
 
76.02.05.07 Giuseppettite [Na42K16Ca6]S64Si48Al48O192(SO4)10Cl2•5H2O P 31c 3m
 
76.02.05.08 Hydroxycancrinite Na4(AlSiO4)3(OH)•(H2O) P 63 6
 
76.02.05.09 Liottite (Ca,Na,K)8(Si,Al)12O24[(SO4),(CO3),Cl,OH]4•(H2O) P 6m2 6 m2
 
76.02.05.10 Microsommite (Na,Ca,K)7-8(Si,Al)12O24(Cl,SO4)2-3 P 6322 6 2 2
 
76.02.05.11 Pitiglianoite Na6K2Si6Al6O24(SO4)•2(H2O) P 63 6
 
76.02.05.12 Quadridavyne (Na,K)6Ca2Al6Si6O24Cl4 P 63/m 6/m
 
76.02.05.13 Sacrofanite (Na,Ca,K)9Si6Al6O24[(OH),(SO4),(CO3),Cl)]4•n(H2O) P 63/mmc ? 6/m 2/m 2/m
 
76.02.05.14 Tounkite (Na,Ca,K)8Al6Si6O24(SO4)2Cl•(H2O) P 6222 6 2 2
 
76.02.05.15 Vishnevite (Na,Ca,K)6(Si,Al)12O24[(SO4),(CO3),Cl2]2-4•n(H2O) P 6322 6 2 2
 
76.02.05.16 Wenkite Ba4Ca6(Si,Al)20O39(OH)2(SO4)3•n(H2O)(?) P 62m 6 m2
 
76.02.05.17 Marinellite! [(Na,K)42Ca6](Si36Al36O144)(SO4)8Cl2•6(H2O) P 31c or P 2c Trig
 
76.02.05.18 Farneseite! (Na37K9Ca10)S56(Si42Al42)S84O168(SO4)12•6(H2O) P 63/m 6/m 2/m 2/m
 
76.02.05.19 Alloriite! Na5K1.5Ca(Si6Al6O24)(SO4)(OH)0.5•H2O P 31c 3m
 
76.02.05.20 Biachellaite (Na,Ca,K)8(Si6Al6O24)(SO4)2(OH)0.5•H2O P 3 3
 
76.02.05.21 IMA2008-006! [Na82.5Ca33K16.5](Si99Al99O396)(SO4)33•4H2O P 3 3
 
76.02.05.22 Kyanoxalite! Na7(Al5-6Si6-7O24)(C2O4)0.5-1.0•5H2O P 63 6
 
76.02.05.23 IMA2008-065! (Na,K)6Ca2(Si6Al6O24)Cl2(CO3) P 63 6
Help on  Strunz Class: Strunz Class: 09.FB.05 09 - SILICATES (Germanates)
  09.F - Tektosilicates without Zeolitic H2O
  09.FB -Tektosilicates with additional anions
 
09.FB.05 Bystrite (Na,K)7Ca(Si6Al6)O24S4.5•(H2O) P 31c 3m
 
09.FB.05 Afghanite (Na,Ca,K)8(Si,Al)12O24(SO4,Cl,CO3)3•(H2O) P 63/mmc, P 63mc, or P 62c Hex
 
09.FB.05 Cancrisilite Na7Al5Si7O24(C03)•3(H2O) P 63 6
 
09.FB.05 Cancrinite Na6Ca2Al6Si6O24(CO3)2 P 63 6
 
09.FB.05 Hydroxycancrinite Na4(AlSiO4)3(OH)•(H2O) P 63 6
 
09.FB.05 Franzinite [(Na,K)30Ca10][Si30Al30O120](SO4)10•2(H2O) P 321 3 2
 
09.FB.05 Liottite (Ca,Na,K)8(Si,Al)12O24[(SO4),(CO3),Cl,OH]4•(H2O) P 6m2 6 m2
 
09.FB.05 Davyne Na4K2Ca2Si6Al6O24(SO4)Cl2 P 63/m 6/m
 
09.FB.05 Giuseppettite [Na42K16Ca6]S64Si48Al48O192(SO4)10Cl2•5H2O P 31c 3m
 
09.FB.05 Quadridavyne (Na,K)6Ca2Al6Si6O24Cl4 P 63/m 6/m
 
09.FB.05 Pitiglianoite Na6K2Si6Al6O24(SO4)•2(H2O) P 63 6
 
09.FB.05 Microsommite (Na,Ca,K)7-8(Si,Al)12O24(Cl,SO4)2-3 P 6322 6 2 2
 
09.FB.05 Vishnevite (Na,Ca,K)6(Si,Al)12O24[(SO4),(CO3),Cl2]2-4•n(H2O) P 6322 6 2 2
 
09.FB.05 Sacrofanite (Na,Ca,K)9Si6Al6O24[(OH),(SO4),(CO3),Cl)]4•n(H2O) P 63/mmc ? 6/m 2/m 2/m
 
09.FB.05 Marinellite! [(Na,K)42Ca6](Si36Al36O144)(SO4)8Cl2•6(H2O) P 31c or P 2c Trig
 
09.FB.05 Tounkite (Na,Ca,K)8Al6Si6O24(SO4)2Cl•(H2O) P 6222 6 2 2
 
09.FB.05 IMA2008-065! (Na,K)6Ca2(Si6Al6O24)Cl2(CO3) P 63 6
 
09.FB.05 Farneseite! (Na37K9Ca10)S56(Si42Al42)S84O168(SO4)12•6(H2O) P 63/m 6/m 2/m 2/m
 
09.FB.05 Biachellaite (Na,Ca,K)8(Si6Al6O24)(SO4)2(OH)0.5•H2O P 3 3
 
09.FB.05 IMA2008-006! [Na82.5Ca33K16.5](Si99Al99O396)(SO4)33•4H2O P 3 3
 
09.FB.05 Alloriite! Na5K1.5Ca(Si6Al6O24)(SO4)(OH)0.5•H2O P 31c 3m
 

Other Microsommite Information

Help on References: References: NAME( Ford32) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Microsommite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Microsommite

(Na,Ca,K)7-8(Si,Al)12O24(Cl,SO4)2-3
Dana No: 76.02.05.10 Strunz No: 09.FB.05
Locality:

 

Notes: