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Montesommaite

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Pollena quarries, Pollena - Trocchia area, Monte Somma, Somma-Vesuvius Complex, Naples Province, Campania, Italy
© Elmar Lackner

Show Montesommaite Photos (17)
Formula:
(K,Na)
 
9
Al
 
9
Si
 
23
O
 
64
·10H
 
2
O
System:Orthorhombic
This page provides mineralogical data about Montesommaite.

Classification of Montesommaite

IMA status:Approved
Strunz 8th edition ID:8/J.25-75
Nickel-Strunz 10th (pending) edition ID:9.GB.30

9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H2O; zeolite family
B : Chains of single connected 4-membered rings
Dana 8th edition ID:77.1.3.12

77 : TECTOSILICATES Zeolites
1 : Zeolite group - True zeolites
Hey's CIM Ref.:16.4.6

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

Type Locality:Pollena quarries, Pollena - Trocchia area, Monte Somma, Somma-Vesuvius Complex, Naples Province, Campania, Italy
Year of Discovery:1990

Crystallography of Montesommaite

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

Optical Data of Montesommaite

Type:Biaxial (-)
RI values: nα = 1.498 nβ = 1.506 nγ = 1.507
2V:Measured: 35° , Calculated: 38°
Maximum Birefringence:δ = 0.009

Chart 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 Montesommaite

Formula:
(K,Na)
 
9
Al
 
9
Si
 
23
O
 
64
·10H
 
2
O
Essential elements:Al, H, K, O, Si
All elements listed in formula:Al, H, K, Na, O, Si

Relationship of Montesommaite to other Species

Member of Group:
Zeolite Group:
Related Minerals - Nickel-Strunz Grouping):

- +
9.GB.05Ammonioleucite
(NH
 
4
,K)AlSi
 
2
O
 
6
9.GB.05Analcime
Na
 
2
[Al
 
2
Si
 
4
O
 
12
] · 2H
 
2
O
9.GB.05Hsianghualite
Ca
 
3
Li
 
2
Be
 
3
[F
 
2
|(SiO
 
4
)
 
3
]
9.GB.05Lithosite
K
 
6
Al
 
4
Si
 
8
O
 
25
·2H
 
2
O
9.GB.05Leucite
KAlSi
 
2
O
 
6
9.GB.05Pollucite
(Cs,Na)
 
2
[Al
 
2
Si
 
4
O
 
12
] · 2H
 
2
O
9.GB.05Wairakite
Ca[Al
 
2
Si
 
4
O
 
12
] · 2H
 
2
O
9.GB.10Laumontite
CaAl
 
2
Si
 
4
O
 
12
·4H
 
2
O
9.GB.15Yugawaralite
CaAl
 
2
Si
 
6
O
 
16
·4H
 
2
O
9.GB.20Roggianite
Ca
 
2
Be(OH)
 
2
Al
 
2
Si
 
4
O
 
13
·2.5H
 
2
O
9.GB.25Goosecreekite
Ca[Al
 
2
Si
 
6
O
 
16
] · 5H
 
2
O
9.GB.35Parthéite
CaAl
 
2
Si
 
2
O
 
8
·2H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
16.4.1Nepheline
(Na,K)[AlSiO
 
4
]
16.4.2Panunzite
(Na,K)[AlSiO
 
4
]
16.4.3Trikalsilite
(Na,K)[AlSiO
 
4
]
16.4.4Anorthoclase
(Na,K)[AlSi
 
3
O
 
8
]
16.4.5Naujakasite
(Na,K)
 
6
(Fe
2+
 
,Mn
2+
 
,Ca)(Al,Fe)
 
4
Si
 
8
O
 
26

Other Names for Montesommaite

Synonyms:
IMA1988-038
Other Languages:
German:Montesommait
Russian:Монтесоммаит
Spanish:Montesommaita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Montesommaite

Reference List:American Mineralogist (1990): 75: 1415-1420.

Mineralogical Record (1999): 30: 5-6.

Internet Links for Montesommaite

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    Localities for Montesommaite

    Hide Locality List
    The 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.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Italy
     
    • Campania
      • Naples Province
        • 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 area
    		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
    		Russo. M., (1996): La Cabasite di Cava Nuovo, http://www.geocities.com/gmgn/n1_96-6.htm
    Mineral and/or Locality
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