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Meionite

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Formula:
Ca4Al6Si6O24CO3
System:
Tetragonal
Colour:
Colorless, white, grey, ...
Hardness:
5 - 6
Member of:
Name:
Named in 1801 by Rene Just Haüy from μειωυ Greek for less, in reference to the less acute pyramidal form as compared to vesuvianite.

Classification of Meionite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
9.FB.15

9 : SILICATES (Germanates)
F : Tektosilicates without zeolitic H2O
B : Tektosilicates with additional anions
17.4.6

17 : Silicates Containing other Anions
4 : Silicates with carbonates
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First Recorded Occurrence of Meionite

Year of Discovery:
1801

Occurrences of Meionite

Geological Setting:
Metamorphosed rock.

Physical Properties of Meionite

Vitreous, Resinous, Pearly
Diaphaneity (Transparency):
Transparent, Opaque
Colour:
Colorless, white, grey, pink, violet, blue, yellow, orange-brown, brown
Streak:
White
Hardness (Mohs):
5 - 6
Tenacity:
Brittle
Cleavage:
Distinct/Good
Distinct on {100}{110}
Fracture:
Irregular/Uneven, Conchoidal
Density:
2.74 - 2.78 g/cm3 (Measured)    2.86 g/cm3 (Calculated)

Crystallography of Meionite

Crystal System:
Tetragonal
Class (H-M):
4/m - Dipyramidal
Space Group:
I4/m
Cell Parameters:
a = 12.179(1) Å, c = 7.571(1) Å
Ratio:
a:c = 1 : 0.622
Unit Cell Volume:
V 1,122.99 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Prismatic, granular, nassive
Comment:
On synthetic material
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Optical Data of Meionite

Type:
Uniaxial (-)
RI values:
nω = 1.590 - 1.600 nε = 1.556 - 1.562
Max Birefringence:
δ = 0.034 - 0.038
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Low

Chemical Properties of Meionite

Formula:
Ca4Al6Si6O24CO3
Essential elements:
All elements listed in formula:
Common Impurities:
Mg,Na,K,Cl,H2O,S

Relationship of Meionite to other Species

Series:
Forms a series with Marialite (see here)
Member of:
Other Members of Group:
Kembleite
MarialiteNa4Al3Si9O24Cl
Scapolite
Silvialite(Ca,Na)4(Al6Si6O24)(SO4,CO3)
9.FB.05Afghanite(Na,Ca,K)8(Al6Si6O24)(Cl2,SO4,CO3)3 · 0.5H2O
9.FB.05Bystrite(Na,K)7Ca(Al6Si6O24)(S3)1.5 · H2O
9.FB.05Cancrinite(Na,Ca,☐)8(Al6Si6O24)(CO3,SO4)2 · 2H2O
9.FB.05CancrisiliteNa7(Al5Si7O24)(CO3) · 3H2O
9.FB.05Davyne(Na,K)6Ca2(Al6Si6O24)(Cl2,SO4)2
9.FB.05Franzinite(Na,K)6Ca2(Al6Si6O24)(SO4)2 · 0.5H2O
9.FB.05Giuseppettite(Na,K,Ca)7-8(Al6Si6O24)(SO4,Cl)1-2
9.FB.05HydroxycancriniteNa8(Al6Si6O24)(OH)2 · 2H2O
9.FB.05Liottite(Na,K)16Ca8(Al6Si6O24)3(SO4)5Cl4
9.FB.05MicrosommiteNa4K2Ca2(Al6Si6O24)(SO4)Cl2
9.FB.05PitiglianoiteNa6K2(Al6Si6O24)(SO4) · 2H2O
9.FB.05Quadridavyne(Na,K)6Ca2(Al6Si6O24)Cl4
9.FB.05Sacrofanite(Na,K)98Ca20(Al6Si6O24)14(SO4)26Cl2 · 8H2O
9.FB.05Tounkite(Na,Ca,K)8(Al6Si6O24)(SO4)2Cl · H2O
9.FB.05Vishnevite(Na,K)8(Al6Si6O24)(SO4,CO3) · 2H2O
9.FB.05Marinellite(Na,K)42Ca6(Al6Si6O24)6(SO4)8Cl2 · 3H2O
9.FB.05Farneseite(Na,Ca,K)56(Al6Si6O24)7(SO4)12 · 6H2O
9.FB.05Alloriite(Na,Ca,K)26Ca4(Al6Si6O24)4(SO4)6Cl6
9.FB.05Fantappièite[Na82.5Ca33K16.5](Si99Al99O396)(SO4)33 · 4H2O
9.FB.05KyanoxaliteNa7(Al6-xSi6+xO24)(C2O4)0.5+x · 5H2O (0 < x < 0.5)
9.FB.05Balliranoite(Na,K)6Ca2(Si6Al6O24)Cl2(CO3)
9.FB.05CarbobystriteNa8(Al6Si6O24)(CO3) · 3.5H2O
9.FB.05DepmeieriteNa8(Al6Si6O24)(PO4,CO3)1-x · 3H2O (x<0.5)
9.FB.05KircheriteNa5Ca2K(Al6Si6O24)(SO4)2 · 0.33H2O
9.FB.10BicchuliteCa2(Al2SiO6)(OH)2
9.FB.10DanaliteFe42+(Be3Si3O12)S
9.FB.10GenthelviteZn4(Be3Si3O12)S
9.FB.10Haüyne(Na,Ca)4-8(Al6Si6O24)(SO4,S,Cl)1-2
9.FB.10HelvineMn42+(Be3Si3O12)S
9.FB.10KamaishiliteCa2(Al2SiO6)(OH)2
9.FB.10LazuriteNa6 Ca2(Al6Si6O24)(SO4,S,S2, S3,Cl,OH)2
9.FB.10NoseanNa8(Al6Si6O24)(SO4) · H2O
9.FB.10SodaliteNa8(Al6Si6O24)Cl2
9.FB.10Tsaregorodtsevite(N(CH3)4)(AlSi5O12)
9.FB.10TugtupiteNa4(AlBeSi4O12)Cl
9.FB.15MarialiteNa4Al3Si9O24Cl
9.FB.15Silvialite(Ca,Na)4(Al6Si6O24)(SO4,CO3)
17.4.1TilleyiteCa5(Si2O7)(CO3)2
17.4.2SpurriteCa5(SiO4)2(CO3)
17.4.3Paraspurrite
17.4.4ScawtiteCa7(Si3O9)2CO3 · 2H2O
17.4.5FukaliteCa4[Si2O6][CO3](OH)2
17.4.7Cancrinite(Na,Ca,☐)8(Al6Si6O24)(CO3,SO4)2 · 2H2O
17.4.8CarletoniteKNa4Ca4Si8O18(CO3)4(OH,F) · H2O
17.4.9Iimoriite-(Y)Y2[SiO4][CO3]
17.4.10Kainosite-(Y)Ca2(Y,Ce)2(Si4O12)(CO3) · H2O
17.4.11Caysichite-(Y)Ca2Y2Si4O10(CO3)3 · 4H2O
17.4.12Lepersonnite-(Gd)Ca(Gd,Dy)2(UO2)24(SiO4)4(CO3)8(OH)24 · 48H2O
17.4.13AshburtonitePb4Cu4(Si4O12)(HCO3)4(OH)3Cl · H2O
17.4.14Surite(Pb,Ca)3(Al,Fe2+,Mg)2((Si,Al)4O10)(CO3)2(OH)2
17.4.15Tundrite-(Ce)Na2Ce2Ti(SiO4)(CO3)2O2
17.4.16Tundrite-(Nd)Na2(Nd,Ce)2Ti(SiO4)(CO3)2O2

Other Names for Meionite

Name in Other Languages:

Other Information

Commonly orange to bright yellow to red under SW and LW
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Meionite

Reference List:
Scacchi, A., (1851): Notiz über den Sommit (Nephelin), Mizzonit und Mejonit, Annalen der Physik und Chemie, Erg. Bd. III, 478-479, J.C. Poggendorff, Leipzig

American Mineralogist (1982): 67: 1229-1241.

Schweizerische mineralogische und petrographische Mitteilungen: 53: 385-393.

Internet Links for Meionite

Specimens:
The following Meionite specimens are currently listed for sale on minfind.com.

Localities for Meionite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Mineral and/or Locality  
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