Meionite Mineral Data

Meionite Mineral Data +

General Meionite Information

Chemical Formula:

Ca4Al6Si6O24CO3

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

Empirical Formula:

Ca₄Al₆Si₆O₂₄(CO₃)

Environment:

Small cavities in limestone ejecta blocks. Forms a series with marialite.

IMA Status:

Valid Species (Pre-IMA) 1801

Locality:

Mte. Somma, Vesuvius, Italy. Link to MinDat.org Location Data.

Name Origin:

From the Greek for "less", referring to its less acute pyramidal form compared with vesuvianite.

Synonym:

ICSD 2628

PDF 44-1399

Wernerite

Meionite Image

Images:

Meionite

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

Images:

Meionite Kaliophilite

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

Axial Ratios:

a:c = 1:0.62071

Cell Dimensions:

a = 12.26, c = 7.61, Z = 2; V = 1,143.84 Den(Calc)= 2.71

Crystal System:

Tetragonal - DipyramidalH-M Symbol (4/m) Space Group: P 4/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.464(1), 3.069(0.7), 3.824(0.6),

Forms:

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Forms: [ 1 0 0] [ 3 1 1] [ 1 1 1] [ 1 1 0]

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Crystal Structure:

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Sherriff B L , Sokolova E V , Kabalov Y K , Jenkins D M , Kunath-Fandrei G , Goetz S , Jager C , Schneider J , The Canadian Mineralogist , 38 (2000) p.1201-1213, Meionite: Rietveld structure-refinement, Si MAS and Al SATRAS NMR, spectroscopy, and comments on the marialite-meionite series, Note: sample BOLT, Locality: Bolton, Massachusetts, USA

View Additional jPOWD Structure files for Meionite
[1] [2] [3]

Physical Properties of Meionite

Cleavage:

[???] Distinct, [???] Indistinct

Color:

Bluish, Brownish, Colorless, Violet, Greenish.

Density:

2.66 - 2.73, Average = 2.69

Diaphaniety:

Transparent to subtranslucent

Fracture:

Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.

Habit:

Columnar - Forms columns

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Hardness:

5-6 - Between Apatite and Orthoclase

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Resinous

Streak:

colorless

Optical Properties of Meionite

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

Optical Data:

Uniaxial (-), e=1.55-1.56, w=1.58-1.6, bire=0.0300-0.0400.

Calculated Properties of Meionite

Electron Density:

r_electron=2.69 gm/cc
note: r_Meionite=2.71 gm/cc.

Fermion Index

Fermion Index = 0.00901
Boson Index = 0.99099

Photoelectric:

PE_Meionite= 3.33 barns/electron
U=PE_Meionite x r_electron= 8.95 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Meionite is Not Radioactive

Meionite Classification

Dana Class:

76.3.1.2 (76)Tectosilicate Al-Si Framework

(76.3)with other Be/Al/Si frameworks

(76.3.1)Scapolite group

76.3.1.0 Scapolite* (Na,Ca)4[Al3Si9O24]Cl P 4₁/n 4/m

76.3.1.1 Marialite Na4Al3Si9O24Cl I 4/m 4/m

76.3.1.2 Meionite Ca4Al6Si6O24CO3 P 4/m 4/m

76.3.1.3 Silvialite! (Ca,Na)4Al6Si6O24(SO4,CO3) I 4/m 4/m

Strunz Class:

VIII/J.13-20 VIII - Silicates

VIII/J - Tectosilicates (network) with anions unfamiliar to the tetraheders

VIII/J.13 - Sodalite group, Marialite - Kalborsite series

VIII/J.13-10 Marialite Na4Al3Si9O24Cl I 4/m 4/m

VIII/J.13-20 Meionite Ca4Al6Si6O24CO3 P 4/m 4/m

VIII/J.13-25 Silvialite! (Ca,Na)4Al6Si6O24(SO4,CO3) I 4/m 4/m

VIII/J.13-30 Sarcolite NaCa6Al4Si6O24F(?) I 4/m 4/m

VIII/J.13-40 Kalborsite K6Al4Si6BO20(OH)4Cl P 42m 4 2m

Other Meionite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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Meionite

Ca4Al6Si6O24CO3
Dana No: 76.3.1.2 Strunz No: VIII/J.13-20
Locality:

Notes: