Mineralogy Database

Meionite Mineral Data

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General Meionite Information

Help on Chemical  Formula: Chemical Formula: Ca4Al6Si6O24CO3
Help on Composition: Composition: Molecular Weight = 934.71 gm
   Calcium   17.15 %  Ca   24.00 % CaO
   Aluminum  17.32 %  Al   32.73 % Al2O3
   Silicon   18.03 %  Si   38.57 % SiO2
   Carbon     1.28 %  C     4.71 % CO2
   Oxygen    46.22 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca4Al6Si6O24(CO3)
Help on Environment: Environment: Small cavities in limestone ejecta blocks. Forms a series with marialite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1801
Help on Locality: Locality: Mte. Somma, Vesuvius, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek for "less", referring to its less acute pyramidal form compared with vesuvianite.
Help on Name Pronunciation: Name Pronunciation: Meionite Say MEIONITE
Help on Synonym: Synonym: ICSD 2628
  PDF 44-1399

Meionite Image

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Comments: Clear meionite crystal on matrix.
Location: Monte Somma (Vesuvius), Campania, Italy. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

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  Kaliophilite   Meionite

Comments: Tan to white fibrous kaliophilite crystal bundle with white translucent meionite on matrix.
Location: Mont Somma, Naples, Campania, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Meionite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.62071
Help on Cell Dimensions: Cell Dimensions: a = 12.26, c = 7.61, Z = 2; V = 1,143.84 Den(Calc)= 2.71
Help on Crystal System: Crystal System: Tetragonal - Dipyramidal H-M Symbol (4/m) Space Group: P 4/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.464(1), 3.069(0.7), 3.824(0.6),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 1 0 0) ( 3 1 1) ( 1 1 1) ( 1 1 0)

Warning: this java applet does not work in some browsers because of security restrictions.


Physical Properties of Meionite

Help on Cleavage: Cleavage: {???} Distinct, {???} Indistinct
Help on Color: Color: Bluish, Brownish, Colorless, Violet, Greenish.
Help on Density: Density: 2.66 - 2.73, Average = 2.69
Help on Diaphaneity: Diaphaneity: Transparent to subtranslucent
Help on Fracture: Fracture: Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.
Help on Habit: Habit: Columnar - Forms columns
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Hardness: Hardness: 5-6 - Between Apatite and Orthoclase
Help on Luminescence: Luminescence: Fluorescent, Short UV=yellow-white, Long UV=red.
Help on Luster: Luster: Vitreous - Resinous
Help on Streak: Streak: colorless

Optical Properties of Meionite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.02 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.014 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2113,KPDmeas= 0.2124,KC= 0.2083
Ncalc = 1.55 - 1.57
Help on Optical Data: Optical Data: Uniaxial (-), e=1.55-1.56, w=1.58-1.6, bire=0.0300-0.0400.

Calculated Properties of Meionite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.69 gm/cc
note: Specific Gravity of Meionite =2.71 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0090139831
Boson Index = 0.9909860169
Help on Photoelectric: Photoelectric: PEMeionite = 3.33 barns/electron
U=PEMeionite x rElectron Density= 8.95 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Meionite is Not Radioactive

Meionite Classification

Help on  Dana Class: Dana Class: (76)Tectosilicate Al-Si Framework
  (76.03)with other Be/Al/Si frameworks
  (76.03.01)Scapolite group Scapolite* (Na,Ca)4[Al3Si9O24]Cl P 41/n 4/m Marialite Na4Al3Si9O24Cl I 4/m 4/m Meionite Ca4Al6Si6O24CO3 P 4/m 4/m Silvialite! (Ca,Na)4Al6Si6O24(SO4,CO3) I 4/m 4/m
Help on  Strunz Class: Strunz Class: 09.FB.15 09 - SILICATES (Germanates)
  09.F - Tektosilicates without Zeolitic H2O
  09.FB -Tektosilicates with additional anions
09.FB.15 Meionite Ca4Al6Si6O24CO3 P 4/m 4/m
09.FB.15 Marialite Na4Al3Si9O24Cl I 4/m 4/m
09.FB.15 Scapolite* (Na,Ca)4[(Al,Si)12O24]Cl P 41/n 4/m
09.FB.15 Silvialite! (Ca,Na)4Al6Si6O24(SO4,CO3) I 4/m 4/m

Other Meionite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(www.saint-hilaire.ca) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Meionite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - EUROmin Project
6 - Ecole des Mines de Paris
7 - Franklin Minerals(Dunn)
8 - GeoScienceWorld
9 - Google Images
10 - Google Scholar
11 - Handbook of Mineralogy (MinSocAm)
12 - Handbook of Mineralogy (UofA)
13 - HyperPhysics
14 - MinDAT
15 - Mineralienatlas (Deutsch)
16 - Online Mineral Museum
17 - QUT Mineral Atlas
18 - Ruff.Info

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Dana No: Strunz No: 09.FB.15





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