Microsommite Mineral Data (original) (raw)

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

Click Here for Larger Microsommite Image in a New Browser Window Images:

Click Here for Larger Microsommite Image in a New Browser Window Images:

Click Here for Larger Microsommite Image 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) Warning: this large pop-up is very compute intensive and may not work well with some computers. | | ---------------------------------------------------------------------------------------------------------------------------------------------------------------- |

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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Print or Cut-and-Paste your Microsommite Specimen Label here :

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: