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Mesolite

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Formula:
Na2Ca2Si9Al6O30 · 8H2O
System:
Orthorhombic
Colour:
Colorless, white, gray, ...
Hardness:
5
Name:
From the Greek for meso = middle and lithos = stone, for its chemical composition is between that of natrolite and scolecite.

Classification of Mesolite

Approved, 'Grandfathered' (first described prior to 1959)
9.GA.05

9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H2O; zeolite family
A : Zeolites with T5O10 Units – The Fibrous Zeolites
77.1.5.4

77 : TECTOSILICATES Zeolites
1 : Zeolite group - True zeolites
16.10.6

16 : Silicates Containing Aluminum and other Metals
10 : Aluminosilicates of Ca and alkalis

Occurrences of Mesolite

Physical Properties of Mesolite

Vitreous
Diaphaneity (Transparency):
Transparent, Translucent, Opaque
Comment:
Silky when fibrous
Colour:
Colorless, white, gray, yellowish
Hardness (Mohs):
5
Tenacity:
Brittle
Cleavage:
Perfect
Perfect on {110} {110}
Fracture:
Irregular/Uneven
Comment:
Compact masses are tough.
Density:
2.26 g/cm3 (Measured)    2.27 g/cm3 (Calculated)

Crystallography of Mesolite

Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Space Group:
Fdd2
Cell Parameters:
a = 18.4049(8) Å, b = 56.655(6) Å, c = 6.5443(4) Å
Ratio:
a:b:c = 0.325 : 1 : 0.116
Unit Cell Volume:
V 6,823.94 ų (Calculated from Unit Cell)
Z:
8
Morphology:
Elongated prismatic crystals, hairlike tufts, porcelaneous, massive.
Twinning:
Characteristically on {010} {100}
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 Mesolite

Type:
Biaxial (+)
RI values:
nα = 1.505 nβ = 1.505 nγ = 1.505
2V:
Measured: 80°
Max Birefringence:
δ = 0.001
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
r > v strong

Chemical Properties of Mesolite

Formula:
Na2Ca2Si9Al6O30 · 8H2O
All elements listed in formula:
Common Impurities:
K

Relationship of Mesolite to other Species

Other Members of Group:
Gonnardite(Na,Ca)2(Si,Al)5O10 · 3H2O
NatroliteNa2Al2Si3O10 · 2H2O
ParanatroliteNa2Al2Si3O10 · 3H2O
ScoleciteCaAl2Si3O10 · 3H2O
TetranatroliteFormerly in Zeolite Group, Natrolite Subgroup.
9.GA.05Gonnardite(Na,Ca)2(Si,Al)5O10 · 3H2O
9.GA.05NatroliteNa2Al2Si3O10 · 2H2O
9.GA.05ParanatroliteNa2Al2Si3O10 · 3H2O
9.GA.05ScoleciteCaAl2Si3O10 · 3H2O
9.GA.10Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
9.GA.10Thomsonite-SrNa(Sr,Ca)2[Al5Si5O20] · 7H2O
9.GA.15EdingtoniteBa[Al2Si3O10] · 4H2O
9.GA.15KalborsiteK6Al4BSi6O20(OH)4Cl
16.10.1Bytownite(Ca,Na)[Al(Al,Si)Si2O8]
16.10.2LisetiteCaNa2Al4Si4O16
16.10.4Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
16.10.5Gonnardite(Na,Ca)2(Si,Al)5O10 · 3H2O
16.10.7Faujasite
16.10.8Garronite-CaNa2Ca5Al12Si20O64 · 27H2O
16.10.9BoggsiteCa8Na3(Si,Al)96O192 · 70H2O
16.10.10Herschelite(Na2,K2,Ca,Sr,Mg)2[Al2Si4O12]2 · 12H2O
16.10.11Phillipsite
16.10.12Fedorite(Na,K)2-3(Ca4Na3)Si16O38(OH,F)2 · 3.5H2O
16.10.13WillhendersoniteKCa[Al3Si3O12] · 5H2O
16.10.14Barrerite(Na,K,Ca0.5)2[Al2Si7O18] · 7H2O
16.10.15Mordenite(Na2,Ca,K2)Al2Si10O24 · 7H2O
16.10.16Reyerite(Na,K)2Ca14(Si,Al)24O58(OH)8 · 6H2O
16.10.17Lévyne
16.10.18Clinoptilolite
16.10.19Heulandite
16.10.20GobbinsiteNa5(Si11Al5)O32 · 11H2O
16.10.21Stilbite
16.10.22Dachiardite
16.10.23OffretiteKCaMg(Si13Al5)O36 · 15H2O
16.10.24PerlialiteK9Na(Ca,Sr)[Al2Si4O12]6 · 15H2O
16.10.25Erionite
16.10.26Paulingite
16.10.27Sodium Dachiardite(Na2,Ca,K2)4-5Al8Si40O96 · 26H2O
16.10.28Mazzite-Mg(Mg,K,Ca)5(Si26Al10)O72 · 28H2O
16.10.29RoggianiteCa2Be(OH)2Al2Si4O13 · 2.5H2O

Other Names for Mesolite

Other Information

Electrical:
May exhibit small pyroelectric effect, piezeoelectric.
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 Mesolite

Reference List:
Neues Jahrbuch für Mineralogie, Abhandlungen: 143: 231-248.

Artioli, G., Smith, J.V., and Pluth, J.J. (1986) X-ray structure refinement of mesolite. Acta Crystallographica: C42: 937-942.

American Mineralogist (1992): 77: 685.

Internet Links for Mesolite

mindat.org URL:
http://www.mindat.org/min-2657.html
Please feel free to link to this page.
Specimens:
The following Mesolite specimens are currently listed for sale on minfind.com.

Localities for Mesolite

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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