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Microsommite

Formula:
Na
 
4
K
 
2
Ca
 
2
[Cl
 
2
|SO
 
4
|Al
 
6
Si
 
6
O
 
24
]
System:HexagonalColour:colourless, white
Hardness:6


Cancrinite Group.

Classification of Microsommite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:8/J.09-30
Nickel-Strunz 10th (pending) edition ID:9.FB.05

9 : SILICATES (Germanates)
F : Tektosilicates without zeolitic H2O
B : Tektosilicates with additional anions
Dana 8th edition ID:76.2.5.10

76 : TECTOSILICATES Al-Si Framework
2 : Al-Si Framework Feldspathoids and related species
Hey's CIM Ref.:17.10.8

17 : Silicates Containing other Anions
10 : Silicates with sulphate, molybdate or tungstate
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Physical Properties of Microsommite

Colour:colourless, white
Streak:white
Hardness (Mohs):6
Cleavage:Perfect

Crystallography of Microsommite

Crystal System:Hexagonal
Cell Parameters:a = 22.08Å, c = 5.33Å
Ratio:a:c = 1 : 0.241
Unit Cell Volume:V 2,250.38 ų (Calculated from Unit Cell)

Optical Data of Microsommite

Type:Uniaxial (+)
RI values: nω = 1.521 nε = 1.529
Maximum Birefringence:δ = 0.008

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low

Chemical Properties of Microsommite

Formula:
Na
 
4
K
 
2
Ca
 
2
[Cl
 
2
|SO
 
4
|Al
 
6
Si
 
6
O
 
24
]
Essential elements:Cl, Na, Si
All elements listed in formula:Al, Ca, Cl, K, Na, O, S, Si

Relationship of Microsommite to other Species

Related to:
  • Cancrinite Group
  • Related Minerals - Nickel-Strunz Grouping):
    9.FB.05Afghanite
    (Na,Ca,K)
     
    8
    [(Cl
     
    2
    ,SO
     
    4
    ,CO
     
    3
    )
     
    3
    |Al
     
    6
    Si
     
    6
    O
     
    24
    ] · 0.5H
     
    2
    O
    9.FB.05Bystrite
    (Na,K)
     
    7
    Ca[(S
     
    3
    )
     
    1.5
    |Al
     
    6
    Si
     
    6
    O
     
    24
    ] · H
     
    2
    O
    9.FB.05Cancrinite
    Na
     
    6
    Ca
     
    2
    [(CO
     
    3
    )
     
    2
    |Al
     
    6
    Si
     
    6
    O
     
    24
    ] · 2H
     
    2
    O
    9.FB.05Cancrisilite
    Na
     
    7
    [CO
     
    3
    |Al
     
    5
    Si
     
    7
    O
     
    24
    ] · 3H
     
    2
    O
    9.FB.05Davyne
    (Na,K)
     
    6
    Ca
     
    2
    [(Cl
     
    2
    ,SO
     
    4
    )
     
    2
    |Al
     
    6
    Si
     
    6
    SO
     
    24
    ]
    9.FB.05Franzinite
    (Na,K)
     
    6
    Ca
     
    2
    [(SO
     
    4
    )
     
    2
    |Al
     
    6
    Si
     
    6
    O
     
    24
    ] · 0.5H
     
    2
    O
    9.FB.05Giuseppettite
    (Na,K,Ca)
     
    7-8
    [(SO
     
    4
    ,Cl)
     
    1-2
    |Al
     
    6
    Si
     
    6
    O
     
    24
    ]
    9.FB.05Hydroxycancrinite
    Na
     
    8
    [(OH)
     
    2
    |Al
     
    6
    Si
     
    6
    O
     
    24
    ] · 2H
     
    2
    O
    9.FB.05Liottite
    (Na,K)
     
    16
    Ca
     
    8
    [Cl
     
    4
    |(SO
     
    4
    )
     
    5
    |(Al
     
    6
    Si
     
    6
    O
     
    24
    )
     
    3
    ]
    9.FB.05Pitiglianoite
    Na
     
    6
    K
     
    2
    [SO
     
    4
    |Al
     
    6
    Si
     
    6
    O
     
    24
    ] · 2H
     
    2
    O
    9.FB.05Quadridavyne
    (Na,K)
     
    6
    Ca
     
    2
    [Cl
     
    4
    |Al
     
    6
    Si
     
    6
    O
     
    24
    ]
    9.FB.05Sacrofanite
    (Na,Ca,K)
     
    9
    [{(OH)
     
    2
    ,SO
     
    4
    ,CO
     
    3
    ,Cl
     
    2
    }
     
    3
    |Al
     
    6
    Si
     
    6
    O
     
    24
    ] · 0.5H
     
    2
    O
    9.FB.05Tounkite
    (Na,Ca,K)
     
    8
    [Cl|(SO
     
    4
    )
     
    2
    |Al
     
    6
    Si
     
    6
    O
     
    24
    ] · H
     
    2
    O
    9.FB.05Vishnevite
    (Na,K)
     
    8
    [(SO
     
    4
    ,CO
     
    3
    )|Al
     
    6
    Si
     
    6
    O
     
    24
    ] · 2H
     
    2
    O
    9.FB.05Marinellite
    (Na,K)
     
    42
    Ca
     
    6
    [Cl
     
    2
    |(SO
     
    4
    )
     
    8
    |(Al
     
    6
    Si
     
    6
    O
     
    24
    )
     
    6
    ] · 3 H
     
    2
    O
    9.FB.05Farneseite
    (Na,Ca,K)
     
    56
    [(SO
     
    4
    )
     
    12
    |Al
     
    42
    Si
     
    42
    O
     
    168
    ] · 6H
     
    2
    O
    9.FB.05Alloriite
    (Na,Ca,K)
     
    26
    Ca
     
    4
    [Cl
     
    6
    |(SO
     
    4
    )
     
    6
    |(Al
     
    6
    Si
     
    6
    O
     
    24
    )
     
    4
    ]
    9.FB.05IMA2008-006
    [Na
     
    82.5
    Ca
     
    33
    K
     
    16.5
    ]
     
    132
    (Si
     
    99
    Al
     
    99
    O
     
    396
    )(SO
     
    4
    )
     
    33
    ·4H
     
    2
    O
    9.FB.10Bicchulite
    Ca
     
    2
    [(OH)
     
    2
    |Al
     
    2
    SiO
     
    6
    ]
    9.FB.10Danalite
    Fe
    2+
    4
    Be
     
    3
    [S|(SiO
     
    4
    )
     
    3
    ]
    9.FB.10Genthelvite
    Zn
     
    4
    Be
     
    3
    [S|(SiO
     
    4
    )
     
    3
    ]
    9.FB.10Haüyne
    (Na,Ca)
     
    4-8
    [Al
     
    6
    Si
     
    6
    (O,S)
     
    24
    ](SO
     
    4
    ,Cl)
     
    1-2
    9.FB.10Helvite
    Mn
    2+
    4
    Be
     
    3
    [S|(SiO
     
    4
    )
     
    3
    ]
    9.FB.10Kamaishilite
    Ca
     
    2
    [(OH)
     
    2
    |Al
     
    2
    SiO
     
    6
    ]
    9.FB.10Lazurite
    (Na,Ca)
     
    8
    [(S,SO
     
    4
    ,Cl
     
    2
    )|Al
     
    6
    Si
     
    6
    O
     
    24
    ]
    9.FB.10Nosean
    Na
     
    8
    [SO
     
    4
    |Al
     
    6
    Si
     
    6
    O
     
    24
    ]
    9.FB.10Sodalite
    Na
     
    8
    [Cl
     
    2
    |Al
     
    6
    Si
     
    6
    O
     
    24
    ]
    9.FB.10Tsaregorodtsevite
    N(CH
     
    3
    )
     
    4
    [AlSi
     
    5
    O
     
    12
    ]
    9.FB.10Tugtupite
    Na
     
    4
    [Cl|BeAlSi
     
    4
    O
     
    12
    ]
    9.FB.10Helvine
    9.FB.15Marialite
    Na
     
    4
    [Cl|(AlSi
     
    3
    O
     
    8
    )
     
    3
    ]
    9.FB.15Meionite
    Ca
     
    4
    [CO
     
    3
    |(Al
     
    2
    Si
     
    2
    O
     
    8
    )
     
    3
    ]
    9.FB.15Silvialite
    (Ca,Na)
     
    4
    [(SO
     
    4
    ,CO
     
    3
    )|(Al
     
    2
    Si
     
    2
    O
     
    8
    )
     
    3
    ]
    Related Minerals - Hey's Index Grouping:
    17.10.1Nosean
    Na
     
    8
    [SO
     
    4
    |Al
     
    6
    Si
     
    6
    O
     
    24
    ]
    17.10.2Pitiglianoite
    Na
     
    6
    K
     
    2
    [SO
     
    4
    |Al
     
    6
    Si
     
    6
    O
     
    24
    ] · 2H
     
    2
    O
    17.10.3Vishnevite
    (Na,K)
     
    8
    [(SO
     
    4
    ,CO
     
    3
    )|Al
     
    6
    Si
     
    6
    O
     
    24
    ] · 2H
     
    2
    O
    17.10.4Haüyne
    (Na,Ca)
     
    4-8
    [Al
     
    6
    Si
     
    6
    (O,S)
     
    24
    ](SO
     
    4
    ,Cl)
     
    1-2
    17.10.5Liottite
    (Na,K)
     
    16
    Ca
     
    8
    [Cl
     
    4
    |(SO
     
    4
    )
     
    5
    |(Al
     
    6
    Si
     
    6
    O
     
    24
    )
     
    3
    ]
    17.10.6Latiumite
    K
     
    2
    Ca
     
    6
    (Si,Al)
     
    11
    O
     
    25
    (SO
     
    4
    ,CO
     
    3
    )
    17.10.7Tuscanite
    (K(Ca,Na)
     
    6
    (Si,Al)
     
    10
    O
     
    22
    [SO
     
    4
    ,CO
     
    3
    ,(OH)
     
    2
    ]·H
     
    2
    O
    17.10.9Delhayelite
    (Na,K)
     
    10
    Ca
     
    5
    Al
     
    6
    Si
     
    32
    O
     
    80
    (Cl
     
    2
    ,F
     
    2
    ,SO
     
    4
    )
     
    3
    ·18H
     
    2
    O
    17.10.10Hydrodelhayelite
    KCa
     
    2
    AlSi
     
    7
    O
     
    17
    (OH)
     
    2
    ·6H
     
    2
    O
    17.10.11Davyne
    (Na,K)
     
    6
    Ca
     
    2
    [(Cl
     
    2
    ,SO
     
    4
    )
     
    2
    |Al
     
    6
    Si
     
    6
    SO
     
    24
    ]
    17.10.12Afghanite
    (Na,Ca,K)
     
    8
    [(Cl
     
    2
    ,SO
     
    4
    ,CO
     
    3
    )
     
    3
    |Al
     
    6
    Si
     
    6
    O
     
    24
    ] · 0.5H
     
    2
    O
    17.10.13Franzinite
    (Na,K)
     
    6
    Ca
     
    2
    [(SO
     
    4
    )
     
    2
    |Al
     
    6
    Si
     
    6
    O
     
    24
    ] · 0.5H
     
    2
    O
    17.10.14Giuseppettite
    (Na,K,Ca)
     
    7-8
    [(SO
     
    4
    ,Cl)
     
    1-2
    |Al
     
    6
    Si
     
    6
    O
     
    24
    ]
    17.10.15Sacrofanite
    (Na,Ca,K)
     
    9
    [{(OH)
     
    2
    ,SO
     
    4
    ,CO
     
    3
    ,Cl
     
    2
    }
     
    3
    |Al
     
    6
    Si
     
    6
    O
     
    24
    ] · 0.5H
     
    2
    O
    17.10.16Chessexite
    (Na,K)
     
    4
    Ca
     
    2
    (Mg,Zn)
     
    3
    Al
     
    8
    [(SO
     
    4
    )
     
    10
    |(SiO
     
    4
    )
     
    2
    ] · 40H
     
    2
    O
    17.10.17Innelite
    Na
     
    2
    (Ba,K)
     
    4
    (Mg,Ca,Fe)Ti
     
    3
    Si
     
    4
    O
     
    18
    (OH,F)
     
    1.5
    SO
     
    4
    17.10.18Thaumasite
    Ca
     
    3
    [CO
     
    3
    |SO
     
    4
    |Si(OH)
     
    6
    ] · 12H
     
    2
    O
    17.10.19Ellestadite
    17.10.20Ellestadite-(Cl)
    Ca
     
    10
    [Cl
     
    2
    |(SO
     
    4
    )
     
    3
    |(SiO
     
    4
    )
     
    3
    ]
    17.10.21Ellestadite-(OH)
    Ca
     
    10
    [(OH,Cl,F)
     
    2
    |(SO
     
    4
    )
     
    3
    |(SiO
     
    4
    )
     
    3
    ]
    17.10.22Ellestadite-(F)
    Ca
     
    10
    [(F,Cl,OH)
     
    2
    |(SO
     
    4
    )
     
    3
    |(SiO
     
    4
    )
     
    3
    ]
    17.10.23Mattheddleite
    Pb
     
    5
    (Si
     
    1.2
    S
     
    1.8
    )O
     
    12
    (Cl
     
    0.6
    OH
     
    0.4
    )
    17.10.24Queitite
    Pb
     
    4
    Zn
     
    2
    [SO
     
    4
    |SiO
     
    4
    |Si
     
    2
    O
     
    7
    ]
    17.10.25Roeblingite
    Pb
     
    2
    Ca
     
    6
    Mn
    2+
     
    [OH|SO
     
    4
    |Si
     
    3
    O
     
    9
    ]
     
    2
    · 4H
     
    2
    O
    17.10.26Yoshimuraite
    Ba
     
    2
    Mn
     
    2
    TiOSi
     
    2
    O
     
    7
    (PO
     
    4
    )(OH)
    17.10.27Kegelite
    Pb
     
    12
    (Zn,Fe)
     
    2
    Al
     
    4
    (SO
     
    4
    )
     
    4
    Si
     
    11
    O
     
    38
    or near
    17.10.28Wenkite
    (Ba,K)
     
    4
    (Ca,Na)
     
    6
    [(SO
     
    4
    )
     
    3
    |(Si,Al)
     
    20
    O
     
    39
    (OH)
     
    2
    ] · 0.5H
     
    2
    O
    17.10.29Macquartite
    Pb
     
    3
    Cu(CrO
     
    4
    )(SiO
     
    3
    )(OH)
     
    4
    ·2H
     
    2
    O
    17.10.30Welinite
    Mn
    3+
    6
    (W
    6+
     
    ,Mg)
     
    0.7
    [(O,OH)
     
    3
    |SiO
     
    4
    ]

    Other Names for Microsommite

    Synonyms:
    Mikrosommite
    German names:
    Microsommit
    Russian names:
    Микросоммит
    Spanish names:
    Microsommita

    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 Microsommite

    Reference List:Rath, G. vom, (1874): Über den Mikrosommit, Annalen der Physik und Chemie, Erg. Bd. VI, 372-376, J.C. Poggendorff, Leipzig.

    Bulletin de la Société française de Minéralogie et de Cristallographie (1968): 91: 34.

    Canadian Mineralogist (1990): 28: 341.

    Internet Links for Microsommite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Microsommite in the Natural History Museum (London) online catalogue
  • Microsommite details from Handbook of Mineralogy (PDF)
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    Localities for Microsommite

    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.
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    (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
            • Sant'Anastasia
    M. Carati - Guida alla mineralogia vesuviana - Calderini, Bologna, 1982
    Rath, G. vom, 1874: Über den Mikrosommit, Annalen der Physik und Chemie, Erg. Bd. VI, 372-376, J.C. Poggendorff, Leipzig
    • Tuscany
      • Grosseto Province
        • Pitigliano
    Liotti L., 1991. I minerali dei vulcani laziali a Pitigliano (Grosseto). Riv. Mineral. Ital., 15 (3): 121-139.
    Mineral and/or Locality
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