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Meionite

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Formula:
(Ca,Na)4(Si,Al)12O24(CO3,SO4,Cl)
System:
Tetragonal
Colour:
Colorless, white, grey, ...
Lustre:
Vitreous, Resinous, Pearly
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

Approved, 'Grandfathered' (first described prior to 1959)
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

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)

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

IMA Formula:
(Ca,Na)4(Si,Al)12O24(CO3,SO4,Cl)
Elements listed in formula:
Common Impurities:
Mg,Na,K,Cl,H2O,S

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, massive.
Comment:
On synthetic material. Teertstra & Sherriff (1996) give a = 12.20(1) and c = 7.556(5) Å for end-member meionite.
X-Ray Powder Diffraction:
Image Loading

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

Occurrences of Meionite

Type Occurrence of Meionite

Relationship of Meionite to other Species

Series:
Forms a series with Marialite (see here)
Member of:
Other Members of Group:
MarialiteNa4Al3Si9O24Cl
ScapoliteThis term generally refers to just the marialite-meionite series, not the full scapolite group, ...
Silvialite(Ca,Na)4(Al6Si6O24)(SO4,CO3)
9.FB.05AfghaniteNa22Ca10(Si24Al24)O96(SO4)6Cl6
9.FB.05Bystrite(Na,K)7Ca(Si6Al6)O24(S3)1.5 · H2O
9.FB.05Cancrinite(Na,Ca,◻)8(Al6Si6)O24(CO3,SO4)2 · 2H2O
9.FB.05CancrisiliteNa7(Si7Al5)O24(CO3) · 3H2O
9.FB.05Davyne(Na,K)6Ca2(Si6Al6)O24Cl3(SO4)0.5
9.FB.05Franzinite(Na,K)30Ca10(Si30Al30)O120(SO4)10 · 2H2O
9.FB.05GiuseppettiteNa42K16Ca6Si48Al48O192(SO4)10Cl2 · 5H2O
9.FB.05Hydroxycancrinite(Na,Ca,K)8(Al6Si6O24)(OH,CO3)2 · 2H2O
9.FB.05LiottiteNa16Ca8Si18Al18O72(SO4)5Cl4
9.FB.05MicrosommiteNa4K2Ca2(SO4)(Si6Al6O24)Cl2
9.FB.05PitiglianoiteK2Na6(Si6Al6)O24(SO4) · 2H2O
9.FB.05QuadridavyneNa6Ca2Si6Al6O24Cl4
9.FB.05Sacrofanite(Na,Ca)9(Si,Al)12O24(OH,SO4,CO3,Cl)4 · nH2O
9.FB.05Tounkite(Na,Ca,K)8(Si6Al6)O24(SO4)2Cl · 0.5H2O
9.FB.05VishneviteNa8(Al6Si6)O24(SO4) · 2H2O
9.FB.05MarinelliteNa42Ca6Al36Si36O144(SO4)8Cl2 · 6H2O
9.FB.05FarneseiteNa46Ca10(Si42Al42O168)(SO4)12 · 6H2O
9.FB.05Alloriite(Na,K,Ca)24(Na,Ca)4Ca4(Si,Al)48O96(SO4)4(SO3,CO3)2(OH,Cl)2 · 4(H2O,OH)
9.FB.05Fantappièite[Na82.5Ca33K16.5]Σ=132(Si99Al99O396)(SO4)33 · 6H2O
9.FB.05KyanoxaliteNa7(Al5-6Si6-7O24)(C2O4)0.5-1.0 · 5H2O
9.FB.05Balliranoite(Na,K)6Ca2(Si6Al6O24)Cl2(CO3)
9.FB.05CarbobystriteNa8(Al6Si6O24)(CO3) · 4H2O
9.FB.05DepmeieriteNa8(Al6Si6O24)(PO4,CO3)1-x · 3H2O; (x<0.5)
9.FB.05Kircherite(Na5Ca2K)(Si6Al6O24)(SO4)2 · 0.33H2O
9.FB.10BicchuliteCa2Al2SiO6(OH)2
9.FB.10DanaliteBe3Fe42+(SiO4)3S
9.FB.10GenthelviteBe3Zn4(SiO4)3S
9.FB.10HaüyneNa3Ca(Si3Al3)O12(SO4)
9.FB.10HelvineBe3Mn42+(SiO4)3S
9.FB.10KamaishiliteCa2(SiAl2)O6(OH)2
9.FB.10LazuriteNa6Ca2(Al6Si6O24)(SO4,S,S2, S3,Cl,OH)2
9.FB.10NoseanNa8(Si6Al6)O24(SO4) · H2O
9.FB.10SodaliteNa4Si3Al3O12Cl
9.FB.10TsaregorodtseviteN(CH3)4Si4(SiAl)O12
9.FB.10TugtupiteNa4BeAlSi4O12Cl
9.FB.15MarialiteNa4Al3Si9O24Cl
9.FB.15SilvialiteCa4Al6Si6O24(SO4)
17.4.1TilleyiteCa5Si2O7(CO3)2
17.4.2SpurriteCa5(SiO4)2(CO3)
17.4.3ParaspurriteCa5(SiO4)2(CO3)
17.4.4ScawtiteCa7(Si3O9)2(CO3) · 2H2O
17.4.5FukaliteCa4Si2O6(CO3)(OH)2
17.4.7Cancrinite(Na,Ca,◻)8(Al6Si6)O24(CO3,SO4)2 · 2H2O
17.4.8CarletoniteKNa4Ca4Si8O18(CO3)4(F,OH) · H2O
17.4.9Iimoriite-(Y)Y2(SiO4)(CO3)
17.4.10Kainosite-(Y)Ca2Y2(SiO3)4(CO3) · H2O
17.4.11Caysichite-(Y)(Ca,Yb,Er)4Y4Si8O20(CO3)6(OH) · 7H2O
17.4.12Lepersonnite-(Gd)CaGd2(UO2)24(CO3)8Si4O28 · 60H2O
17.4.13AshburtoniteHPb4Cu4(Si4O12)(HCO3)4(OH)4Cl
17.4.14Surite(Pb,Ca)3Al2(Si,Al)4O10(CO3)2(OH)3 · 0.3H2O
17.4.15Tundrite-(Ce)Na2Ce2TiO2SiO4(CO3)2
17.4.16Tundrite-(Nd)Na2Nd2TiO2(SiO4)(CO3)2

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.

Teertstra, D.K. and Sherriff, B.L. (1996): Scapolite cell-parameter trends along the solid-solution series. American Mineralogist, 81, 169-180.

Sokolova, E., Hawthorne, F.C. (2008): The crystal chemistry of the scapolite-group minerals. I. Crystal structure and long-range order. The Canadian Mineralogist 46, 1527-1554.

Anato, S.M. & Hassan, I. (2011): The structures of marialite (Me6) and meionite (Me93) in space groups P42/n and I4/m, and the absence of phase transitions in the scapolite series. Powder Diffraction 26, 119-125.

Internet Links for Meionite

mindat.org URL:
https://www.mindat.org/min-2627.html
Please feel free to link to this page.
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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