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Davyne

Big Photo

Pollena - Trocchia area, Monte Somma, Somma-Vesuvius Complex, Naples Province, Campania, Italy
© C.Boutry

Show Davyne Photos (4)
Formula:
(Na,K)
 
6
Ca
 
2
[(Cl
 
2
,SO
 
4
)
 
2
|Al
 
6
Si
 
6
SO
 
24
]
System:HexagonalColour:Colourless, white
Lustre:VitreousHardness:6
Name:For Sir Humphrey Davy (1778-1829), English chemist


Cancrinite Group.

Classification of Davyne

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:8/J.09-20
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:76.2.5.5

76 : TECTOSILICATES Al-Si Framework
2 : Al-Si Framework Feldspathoids and related species
Hey's CIM Ref.:17.10.11

17 : Silicates Containing other Anions
10 : Silicates with sulphate, molybdate or tungstate
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Type Occurrence of Davyne

Type Locality:Monte Somma, Somma-Vesuvius Complex, Naples Province, Campania, Italy
Year of Discovery:1825

Physical Properties of Davyne

Lustre:Vitreous
Colour:Colourless, white
Streak:white
Hardness (Mohs):6
Cleavage:Perfect

Crystallography of Davyne

Crystal System:Hexagonal
Cell Parameters:a = 12.7Å, c = 5.33Å
Ratio:a:c = 1 : 0.42
Unit Cell Volume:V 744.50 ų (Calculated from Unit Cell)

Optical Data of Davyne

Type:Uniaxial (+)
RI values: nω = 1.518 - 1.522 nε = 1.517 - 1.527
Maximum Birefringence:δ = 0.001

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

Chemical Properties of Davyne

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

Relationship of Davyne 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.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.05Microsommite
    Na
     
    4
    		K
     
    2
    		Ca
     
    2
    		[Cl
     
    2
    		|SO
     
    4
    		|Al
     
    6
    		Si
     
    6
    		O
     
    24
    		]
    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
    17.10.8Microsommite
    Na
     
    4
    		K
     
    2
    		Ca
     
    2
    		[Cl
     
    2
    		|SO
     
    4
    		|Al
     
    6
    		Si
     
    6
    		O
     
    24
    		]
    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
    17.10.12Afghanite
    (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 Davyne

    German names:
    Davyn
    Russian names:
    Давин
    Varieties:
    Acarbodavyne

    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 Davyne

    Reference List:Monticelli, T., Covelli, N. (1825): Prodromo della Mineralogica Vesuviana, Napoli.

    Haidinger, W. (1827): Über den Davyn, eine neue Mineralspecies, Annalen der Physik und Chemie, Vol. 87/F2-11, 470-474.

    Bonaccorsi E., Merlino S., Pasero M.(1990): Davyne: its structural relationships with cancrinite and vishnevite. Neues Jahrbuch für Mineralogie, Monatshefte, H. 3, 97-112.

    Canadian Mineralogist (1990): 28: 341-349.

    Internet Links for Davyne

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    Localities for Davyne

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    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.
    Egypt
     
    • Red Sea
    		Bonaccorsi E., Merlino S., Pasero M.(1991): Davyne from Zabargad (St. John's) Island: peculiar chemical and structural features. Acta Vulcanol., 2, 55-63.
    Germany
     
    • Rhineland-Palatinate
      • Eifel Mts
        • Andernach
          • Eich
    		Hentschel, G., Die Mineralien der Eifelvulkane, Weise Verlag München, 1983
        • Laach lake volcanic complex
          • Kruft
    		Brauns, R. ; Uhlig, J., Cancrinit- und Nephelin-führende Auswürflinge aus dem Laacher See Gebiet, N.Jb. Mineral.Geol.Paläonolog., Beil. Band 56, Abt. A, 468-498, 1913
          • Mendig
            • Niedermendig
    		Brauns, R. ; Uhlig, J., Cancrinit- und Nephelin-führende Auswürflinge aus dem Laacher See Gebiet, N.Jb. Mineral.Geol.Paläonolog., Beil. Band 56, Abt. A, 468-498, 1913
    Brauns, R. ; Uhlig, J., Cancrinit- und Nephelin-führende Auswürflinge aus dem Laacher See Gebiet, N.Jb. Mineral.Geol.Paläonolog., Beil. Band 56, Abt. A, 468-498, 1913)
              • Wingertsberg Mt.
    		Brauns, R. ; Uhlig, J., Cancrinit- und Nephelin-führende Auswürflinge aus dem Laacher See Gebiet, N.Jb. Mineral.Geol.Paläonolog., Beil. Band 56, Abt. A, 468-498, 1913
          • Niederzissen
            • Glees
    		Brauns, R. ; Uhlig, J., Cancrinit- und Nephelin-führende Auswürflinge aus dem Laacher See Gebiet, N.Jb. Mineral.Geol.Paläonolog., Beil. Band 56, Abt. A, 468-498, 1913
        • Mayen
          • Ettringen
    		[Blass, G., Graf, H.W., Interessante Neuigkeiten über Cancrinit, Fluorit und Fuchsit aus der Vulkaneifel, Mineralien-Welt 12/1, 26-29, 2001] [Lapis, 15 (5), 9-36]
        • Niederzissen
          • Brenk
    		Blass, G., Graf , HW., Interessante Neuigkeiten über Cancrinit, Fluorit und Fuchsit aus der Vulkaneifel, MW 1/2001
          • Burgbrohl
    		Blass, G., Graf , HW., Neufunde von bekannten Fundorten (VI), MW 6/1992
          • Hannebach
    		Hentschel, G., Die Mineralien der Eifelvulkane, Weise Verlag München, 1983
    Italy
     
    • Campania
      • Naples Province
        • Somma-Vesuvius Complex
    		NJMM (1990) (3), 97
            • Ercolano
              • San Vito
            • Pollena - Trocchia area
    		Carati M., 1982. Guida alla mineralogia vesuviana. Guide Calderini, Bologna.
    M. Carati - Guida alla mineralogia vesuviana - Calderini, Bologna, 1982
    [BINON J., BONACCORSI E., BERNHARDT H.J., FRANSOLET A. M. (2004) - The mineralogical status of "cavolinite" from Vesuvius, Italy, and crystallochemical data on the davyne subgroup. Eur. J. Mineral., 16 (3), 511-520] [Russo, M., Punzo, I. (2004): I minerali del Somma-Vesuvio, AMI]
    • Latium
      • Viterbo Province
    		Stoppani, F.S., Curti, E. (1982): I Minerali del Lazio. Ed. Olimpia, Firenze, 154-158
        • Vico Lake
    		No reference listed
    • Tuscany
      • Grosseto Province
        • Pitigliano
    		Liotti L., 1991. I minerali dei vulcani laziali a Pitigliano (Grosseto). Riv. Mineral. Ital., 15 (3): 121-139.
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