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Montesommaite

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About MontesommaiteHide

Formula:
(K,Na)9Al9Si23O64 · 10H2O
Crystal System:
Orthorhombic
Member of:
Name:
Named in 1990 by Roland C. Rouse, Pete J. Dunn, Joel D. Grice, John L. Sclenker, and John B. Higgins after the type locality of Monte Somma, "the high ridge that constitutes the remains of the volcanic cone that preceded Vesuvius".

Classification of MontesommaiteHide

Approved
9.GB.30

9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H2O; zeolite family
B : Chains of single connected 4-membered rings
77.1.3.12

77 : TECTOSILICATES Zeolites
1 : Zeolite group - True zeolites
16.4.6

16 : Silicates Containing Aluminum and other Metals
4 : Aluminosilicates of Na and K

Optical Data of MontesommaiteHide

Type:
Biaxial (-)
RI values:
nα = 1.498 nβ = 1.506 nγ = 1.507
2V:
Measured: 35° , Calculated: 38°
Max Birefringence:
δ = 0.009
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
very weak

Chemical Properties of MontesommaiteHide

Formula:
(K,Na)9Al9Si23O64 · 10H2O
IMA Formula:
K9(Si23Al9)O64 · 10H2O

Crystallography of MontesommaiteHide

Crystal System:
Orthorhombic
Cell Parameters:
a = 10.09 Å, b = 10.09 Å, c = 17.3 Å
Ratio:
a:b:c = 1 : 1 : 1.715
Unit Cell V:
1,761.28 ų (Calculated from Unit Cell)

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0001338MontesommaiteRouse R C, Dunn P J, Grice J D, Schlenker J L, Higgins J B (1990) Montesommaite, (K,Na)9Al9Si23O64.10H2O, a new zeolite related to merlinoite and the gismondine group American Mineralogist 75 1415-142019900293
CIF Raw Data - click here to close

Type Occurrence of MontesommaiteHide

Synonyms of MontesommaiteHide

Other Language Names for MontesommaiteHide

Relationship of Montesommaite to other SpeciesHide

Member of:
Other Members of this group:
AlflarseniteNaCa2Be3Si4O13(OH) · 2H2OMon. 2 : P21
AmiciteK2Na2Al4Si4O16 · 5H2OMon. 2
Ammonioleucite(NH4)(AlSi2O6)Tet.
AnalcimeNa(AlSi2O6) · H2OTric. 1 : P1
Bellbergite(K,Ba,Sr)2Sr2Ca2(Ca,Na)4[Al3Si3O12]6 · 30H2OHex.
BikitaiteLiAlSi2O6 · H2OTric. 1 : P1
BoggsiteCa8Na3(Si,Al)96O192 · 70H2OOrth. mmm (2/m 2/m 2/m) : Imma
Brewsterite-Ba(Ba,Sr)[Al2Si6O16] · 5H2OMon. 2/m : P21/m
Brewsterite-Sr(Sr,Ba,Ca)[Al2Si6O16] · 5H2OMon. 2/m : P21/m
Chabazite-Levyne Subgroup(Ca/Na2/K2/Mg/Sr)[Al2Si4O12] · 6H2O
ChiavenniteCaMnBe2Si5O13(OH)2 · 2H2OMon. 2/m : P21/b
Clinoptilolite(Na/Ca)3-6(Si30Al6)O72·20H2O
CowlesiteCaAl2Si3O10 · 6H2OOrth.
Dachiardite-Ca(Ca,Na2,K2)5Al10Si38O96 · 25H2OMon.
Dachiardite-KK4(Si20Al4O48)·13H2OMon.
Dachiardite-Na(Na2,Ca,K2)5Al10Si38O96 · 25H2OMon.
DirenzoiteNaK6MgCa2(Al13Si47O120) · 36H2OOrth. mmm (2/m 2/m 2/m) : Pmmn
EdingtoniteBa[Al2Si3O10] · 4H2OOrth. 2 2 2 : P21 21 21
EpistilbiteCaAl2Si6O16 · 5H2OMon.
ErioniteThis name now refers to a group of related minerals.
Faujasite(Na2/Ca/Mg)3 · 5[Al7Si17O48] · 32H2O
FerrieriteZeolite Group.
FerrochiavenniteCa1-2Fe[(Si,Al,Be)5Be2O13(OH)2] · 2H2OMon. 2/m : P21/b
Flörkeite(K3Ca2Na)[Al8Si8O32] · 12H2OTric. 1 : P1
Garronite-CaNa2Ca5Al12Si20O64 · 27H2OTet. 4 2m : I4m2
GaultiteNa4Zn2Si7O18 · 5H2OOrth. mm2 : Fdd2
Gismondine-BaBa2Al4Si4O16 · 4-6H2O
Gismondine-CaCaAl2Si2O8 · 4H2OMon. 2/m : P21/b
GmeliniteIn 1997, gmelinite was split into Gmelinite-Ca, Gmelinite-Na and Gmelinite-K.
GobbinsiteNa5(Si11Al5)O32 · 11H2OOrth.
GoosecreekiteCa[Al2Si6O16] · 5H2OMon.
GottardiiteNa3Mg3Ca5Al19Si117O272 · 93H2OOrth.
HeulanditeNote on the distinguishing differences between heulandite and clinoptilolite (http://rruff.
HsianghualiteCa3Li2(Be3Si3O12)F2Iso. 4 3 2 : I41 3 2
KirchhoffiteCs(BSi2O6)Tet. 4/mmm (4/m 2/m 2/m) : I41/acd
LaumontiteCaAl2Si4O12 · 4H2OMon. 2/m : B2/m
LovdariteK2Na6Be4Si14O36 · 9H2OOrth. mm2
MaricopaitePb7Ca2(Si,Al)48O100 · 32H2OOrth.
MartinandresiteBa2(Al4Si12O32)·10H2OOrth. mmm (2/m 2/m 2/m) : Pmmn
Mazzite-Mg(Mg,K,Ca)5(Si26Al10)O72 · 28H2OHex.
Mazzite-NaNa8[Al4Si14O36]2 · 30H2OHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
Merlinoite(K,Na)5(Ca,Ba)2Al9Si23O64 · 23H2OOrth.
Mordenite(Na2,Ca,K2)4(Al8Si40)O96 · 28H2OOrth.
MutinaiteNa3Ca4Si85Al11O192 · 60H2OOrth.
NabesiteNa2BeSi4O10 · 4H2OOrth. 2 2 2 : P21 21 21
Natrolite SubgroupA subgroup of the Zeolite Group.
OffretiteKCaMg(Si13Al5)O36 · 15H2OHex. 6 m2 : P6m2
PahasapaiteLi8(Ca,Li,K)10.5Be24(PO4)24 · 38H2OIso. 2 3 : I2 3
ParthéiteCa2(Si4Al4) O15 (OH)2•4H2OMon. 2/m : B2/b
Paulingite-Ca(Ca,K,Na,Ba,◻)10 (Si, Al)42O84•34H2OIso.
Paulingite-K(K2,Ca,Na2,Ba)5[Al10Si35O90] · 45H2OIso.
Paulingite-Na(Na2,K2,Ca,Ba)5[Al10Si35O90] · 45H2OIso.
PerlialiteK9Na(Ca,Sr)[Al2Si4O12]6 · 15H2OHex.
Phillipsite subgroupZeolite Group.
Pollucite(Cs,Na)2(Al2Si4O12) · 2H2OIso. m3m (4/m 3 2/m) : Ia3d
RoggianiteCa2Be(OH)2Al2Si4O13 · 2.5H2OTet.
Stilbite subgroup(Na/Ca/K)6-7[Al8-9Si27-28O72] · nH2O
Terranovaite(Na,Ca)8(Si68Al12)O160 · 29H2OOrth.
Thomsonite-CaNaCa2[Al5Si5O20] · 6H2OOrth. mmm (2/m 2/m 2/m)
Thomsonite-SrNa(Sr,Ca)2[Al5Si5O20] · 7H2OOrth. mmm (2/m 2/m 2/m)
Tschernichite(Ca,Na2)[Al2Si4O12] · 4-8H2OTet. 4/mmm (4/m 2/m 2/m) : P4/mmm
TschörtneriteCa4(Ca,Sr,K,Ba)3Cu3[Al3Si3O12]4(OH)8 · nH2OIso. m3m (4/m 3 2/m) : Fm3m
UM1996-38-SiO:AlCaHNaNa-Ca-Al-Si-O-H
UM1999-33-SiO:AlHKNaK7Na5Al12Si20O64•24H2O
UM2002-40-SiO:AlCaHKMgNa(Mg,Ca,Na,K)7.5(Al12.8Si51.2)O128•65H2OTet. 4 2 2 : P41 2 2
WairakiteCa(Al2Si4O12) · 2H2OMon. 2/m
WeinebeneiteCaBe3(PO4)2(OH)2 · 4H2OMon.
Wenkite(Ba,K)4(Ca,Na)6[(Si,Al)20O39(OH)2](SO4)3 · 0.5H2OHex.
WillhendersoniteKCa[Al3Si3O12] · 5H2OTric.
YugawaraliteCaAl2Si6O16 · 4H2OMon.

Common AssociatesHide

Associated Minerals Based on Photo Data:
4 photos of Montesommaite associated with Merlinoite(K,Na)5(Ca,Ba)2Al9Si23O64 · 23H2O
1 photo of Montesommaite associated with Phillipsite-K(K,Na,Ca0.5,Ba0.5)4-7[Al4-7Si12-9O32] . 12H2O
1 photo of Montesommaite associated with CalciteCaCO3

Related Minerals - Nickel-Strunz GroupingHide

9.GB.05Ammonioleucite(NH4)(AlSi2O6)Tet.
9.GB.05AnalcimeNa(AlSi2O6) · H2OTric. 1 : P1
9.GB.05HsianghualiteCa3Li2(Be3Si3O12)F2Iso. 4 3 2 : I41 3 2
9.GB.05LithositeK6Al4Si8O25 · 2H2OMon.
9.GB.05LeuciteK(AlSi2O6)Tet. 4/m : I41/a
9.GB.05Pollucite(Cs,Na)2(Al2Si4O12) · 2H2OIso. m3m (4/m 3 2/m) : Ia3d
9.GB.05WairakiteCa(Al2Si4O12) · 2H2OMon. 2/m
9.GB.05KirchhoffiteCs(BSi2O6)Tet. 4/mmm (4/m 2/m 2/m) : I41/acd
9.GB.10LaumontiteCaAl2Si4O12 · 4H2OMon. 2/m : B2/m
9.GB.15YugawaraliteCaAl2Si6O16 · 4H2OMon.
9.GB.20RoggianiteCa2Be(OH)2Al2Si4O13 · 2.5H2OTet.
9.GB.25GoosecreekiteCa[Al2Si6O16] · 5H2OMon.
9.GB.35ParthéiteCa2(Si4Al4) O15 (OH)2•4H2OMon. 2/m : B2/b

Related Minerals - Dana Grouping (8th Ed.)Hide

77.1.3.1GismondineMon.
77.1.3.2AmiciteK2Na2Al4Si4O16 · 5H2OMon. 2
77.1.3.3Garronite-CaNa2Ca5Al12Si20O64 · 27H2OTet. 4 2m : I4m2
77.1.3.4GobbinsiteNa5(Si11Al5)O32 · 11H2OOrth.
77.1.3.5Harmotome(Ba0.5,Ca0.5,K,Na)5[Al5Si11O32] · 12H2OMon. 2/m : P21/m
77.1.3.8PerlialiteK9Na(Ca,Sr)[Al2Si4O12]6 · 15H2OHex.
77.1.3.9Paulingite
77.1.3.10Mazzite
77.1.3.11Merlinoite(K,Na)5(Ca,Ba)2Al9Si23O64 · 23H2OOrth.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

16.4.1NephelineNa3K(Al4Si4O16)Hex. 6 : P63
16.4.2Panunzite(K,Na)AlSiO4Hex. 6 : P63
16.4.3Trikalsilite(K,Na)AlSiO4Hex.
16.4.4Anorthoclase(Na,K)AlSi3O8Tric.
16.4.5Naujakasite(Na,K)6(Fe2+,Mn2+,Ca)(Al,Fe)4Si8O26Mon. 2/m : B2/m

Other InformationHide

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 MontesommaiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Rouse, R.C., Dunn, P.J., Grice, J.D., Schlenker, J.L., Higgins, J.B. (1990) Montesommaite, (K,Na)9Al9Si23O64·10H2O, a new zeolite related to merlinoite and the gismondine group. American Mineralogist: 75: 1415-1420.
Coombs, D.S., Alberti, A., Armbruster, T., Artioli, G., Colella, C., Galli, E., Grice, J.D., Liebau, F., Mandarino, J.A., Minato, H., Nickel, E.H., Passaglia, E., Peacor, D.R., Quartieri, S., Rinaldi, R., Ross, M., Sheppard, R.A., Tillmanns, E., Vezzalini, G. (1997) Recommended nomenclature for zeolite minerals: report of the Subcommittee on Zeolites of the International Mineralogical Association, Commission on New Minerals and Mineral Names. Canadian Mineralogist: 35: 1571-1606.
Joseph A. Mandarino (1999) The zeolite group. Mineralogical Record: 30: 5-6.

Internet Links for MontesommaiteHide

Localities for MontesommaiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Italy
 
  • Campania
    • Naples
      • Somma-Vesuvius Complex
        • Monte Somma
          • Ercolano
            • San Vito
Ciriotti, M.E., Fascio, L. Pasero. M. (2004): Italian Type Minerals. Felici, Ed., Pisa, CD-ROM.
          • Pollena Trocchia
Rouse, R.C., Dunn, P.J., Grice, J.D., Schlenker, J.L., Higgins, J.B. (1990): Montesommaite, (K,Na)9Al9Si23O64•10H2O,a new zeolite related to merlinoite and the gismondine group. American Mineralogist, 75, 1415-1420
          • Sant'Anastasia
Giorgio Bortolozzi (visual identification); Giorgio Bortolozzi collection
          • Somma Vesuviana
Russo, M. (1996) La Cabasite di Cava Nuova. Notizie del Gruppo Mineralogico Geologico Napoletano, 1, 1, 4.
 
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