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Davyne

A valid IMA mineral species - grandfathered
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About DavyneHide

00199010017271922486292.jpg
Sir Humphry Davy
Formula:
(Na,K)6Ca2(Al6Si6O24)(Cl2,SO4)2
Colour:
Colourless, white
Lustre:
Vitreous
Hardness:
5½ - 6
Specific Gravity:
2.42 - 2.53
Crystal System:
Hexagonal
Name:
Named by T. Monticelli and N. Covelli in 1825 in honor of Sir Humphry Davy (17 December 1778, Penzance, Cornwall, England - 29 May 1829, Geneva, Switzerland), chemist who first isolated potassium, sodium, calcium, strontium, barium, magnesium and boron.

Cancrinite Group.

In the structure there are large channels closed by 12-membered tetrahedra rings. The channels are surrounded by cages, that are set in columns. In the "davyne subgroup" the cages contain [CaCl]+ lusters.


Unique IdentifiersHide

Mindat ID:
1238
Long-form identifier:
mindat:1:1:1238:2

IMA Classification of DavyneHide

Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
(Na,K)6Ca2(Si6Al6)O24Cl3(S6+O4)0.5
First published:
1825

Classification of DavyneHide

9.FB.05

9 : SILICATES (Germanates)
F : Tektosilicates without zeolitic H2O
B : Tektosilicates with additional anions
76.2.5.5

76 : TECTOSILICATES Al-Si Framework
2 : Al-Si Framework Feldspathoids and related species
17.10.11

17 : Silicates Containing other Anions
10 : Silicates with sulphate, molybdate or tungstate

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference for Standard
DvyIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of DavyneHide

Vitreous
Transparency:
Transparent, Translucent
Colour:
Colourless, white
Streak:
White
Hardness:
5½ - 6 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
on (10_10)
perfect to indistinct on {0001}
Fracture:
Irregular/Uneven, Conchoidal
Density:
2.42 - 2.53 g/cm3 (Measured)    2.50 g/cm3 (Calculated)

Optical Data of DavyneHide

Type:
Uniaxial (+)
RI values:
nω = 1.515 - 1.519 nε = 1.519 - 1.522
Max. Birefringence:
δ = 0.003 - 0.004
Based on recorded range of RI values above.

Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.

Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.

Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.

Surface Relief:
Low (negative)
Relative to Canada balsam mounting medium (n ≈ 1.537).

This shows the grain boundary and Becke line effect under plane-polarised light, based on the contrast between this mineral's average refractive index and the mounting medium. It does not take into account mineral colouration.
In focus
Interference Figure:
This shows the idealized uniaxial interference figure - the conoscopic (convergent-light, Bertrand-lens-in) view, for a grain cut with the optic axis centred and vertical. The coloured rings are isochromatics, computed with the same physics as the Michel-Lévy bar above; the dark cross is the isogyre.

For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.

Chemistry of DavyneHide

Mindat Formula:
(Na,K)6Ca2(Al6Si6O24)(Cl2,SO4)2
Element Weights:
Element% weight
O35.743 %
Si15.686 %
Al15.069 %
Cl13.201 %
Na12.840 %
Ca7.461 %

Calculated from ideal end-member formula.
O
Si
Al
Cl
Na
Ca

Crystallography of DavyneHide

Crystal System:
Hexagonal
Class (H-M):
6/m - Dipyramidal
Space Group:
P63/m
Cell Parameters:
a = 12.705(4) Å, c = 5.368(3) Å
Ratio:
a:c = 1 : 0.423
Unit Cell V:
750.40 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Prismatic crystals to 4 cm.

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0012420DavyneRozenberg K A, Rastsvetaeva R K, Chukanov N V (2009) Crystal structures of oxalate-bearing cancrinite with an unusual arrangement of CO3 groups and sulfate-rich davyne Crystallography Reports 54 793-7992009Sar-e Sang mine, Badakhshan, Afghanistan0293
0014841DavyneBonaccorsi E, Merlino S, Pasero M (1990) Davyne: its structural relationships with cancrinite and vishnevite Neues Jahrbuch fur Mineralogie, Monatshefte 1990 97-1121990Monte Somma, Vesuvius, Italy0293
0005241DavyneHassan I, Grundy H D (1990) Structure of davyne and implications for stacking faults Sample 1469 The Canadian Mineralogist 28 341-34919900293
0005240DavyneHassan I, Grundy H D (1990) Structure of davyne and implications for stacking faults Sample BM1907,210 The Canadian Mineralogist 28 341-34919900293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.658 Å(100)
4.790 Å(73)
3.272 Å(70)
2.112 Å(48)
2.438 Å(22)
2.663 Å(19)
1.781 Å(19)
4.147 Å(17)
Comments:
M. Somma-Vesuvius, Italy. Data from Ballirano et al. (1997). Davyne can be distinguished from quadridavyne only by single-crystal diffraction.

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
High-? alteration and/or metamorphism
31 : Thermally altered carbonate, phosphate, and iron formations
Stage 4b: Highly evolved igneous rocks>3.0
35 : Ultra-alkali and agpaitic igneous rocks
Geological Setting:
Volcanic ejecta and leucite rich lavas.

Type Occurrence of DavyneHide

Place of Conservation of Type Material:
No defined type material.

Other Language Names for DavyneHide

German:Davyn
Russian:Давин

Varieties of DavyneHide

AcarbodavyneVariety of Davyne free of Carbon Dioxide. A member of the Cancrinite group.

Relationship of Davyne to other SpeciesHide

Other Members of Cancrinite Group:
Afghanite(Na,K)22Ca10(Si24Al24O96)(SO4)6Cl6Trig. 3m : P31c
Alloriite(Na,Ca,K)26Ca4(Al6Si6O24)4(SO4)6Cl6Trig. 3m : P31c
Balliranoite(Na,K)6Ca2(Si6Al6O24)Cl2(CO3)Hex. 6 : P63
BetziteNa6Ca2(Al6Si6O24)Cl4Hex. 6 : P63
Biachellaite(Na,Ca,K)8(Al6Si6O24)(SO4)2(OH)0.5 · H2OTrig. 3 : P3
Bystrite(Na,K)7Ca(Al6Si6O24)(S5)ClTrig. 3m : P31c
Cancrinite(Na,Ca,◻)8(Al6Si6O24)(CO3,SO4)2 · 2H2OHex. 6 : P63
CancrisiliteNa7(Al5Si7O24)(CO3) · 3H2OHex. 6mm : P63mc
CarbobystriteNa8(Al6Si6O24)(CO3) · 3.5H2OTrig. 3m : P31c
DepmeieriteNa8(Al6Si6O24)(PO4,CO3)1-x · 3H2O (x<0.5)Hex. 6 : P63
Fantappièite[Na82.5Ca33K16.5](Si99Al99O396)(SO4)33 · 4H2OTrig. 3 : R3
Farneseite(Na,Ca,K)56(Al6Si6O24)7(SO4)12 · 6H2OHex. 6/m : P63/m
Franzinite(Na,K)6Ca2(Al6Si6O24)(SO4)2 · 0.5H2OHex.
Giuseppettite(Na,K,Ca)7-8(Al6Si6O24)(SO4,Cl)1-2Trig. 3m : P31c
HydroxycancriniteNa8(Al6Si6O24)(OH)2 · 2H2OHex. 6 : P63
KircheriteNa5Ca2K(Al6Si6O24)(SO4)2 · 0.33H2OTrig. 32 : R32
KyanoxaliteNa7(Al6-xSi6+xO24)(C2O4)0.5+x · 5H2O (0 < x < 0.5)Hex. 6 : P63
Liottite(Na,K)16Ca8(Al6Si6O24)3(SO4)5Cl4Hex. 6 : P6
Marinellite(Na,K)42Ca6(Al6Si6O24)6(SO4)8Cl2 · 3H2OTrig. 3m : P31c
MicrosommiteNa4K2Ca2(Al6Si6O24)(SO4)Cl2Hex. 622 : P6322
PitiglianoiteNa6K2(Al6Si6O24)(SO4) · 2H2OHex. 6 : P63
Quadridavyne(Na,K)6Ca2(Al6Si6O24)Cl4Hex. 6/m : P63/m
Sacrofanite(Na61K19Ca32)(Si84Al84O336)(SO4)26Cl2F6 · 2H2OHex.
SteudeliteNa3(K17Ca7)Ca4(Al24Si24O96)(SO3)6F6 · 4H2OHex. 6m2 : P62c
SulfhydrylbystriteNa5K2Ca[Al6Si6O24](S5)2(SH)Trig. 3m : P31c
Tounkite(Na,Ca,K)8(Si6Al6)O24(SO4)2Cl · 0.5H2OHex. 622 : P6222
'UM2004-48-SiO:AlClCaNaS'(Na,Ca)8(Si6Al6)O24(SO4)1.7Cl1.3
'UM2009-23-SiO:AlCCaClHKNaS'(Na,Ca)24K10[(Si,Al)60O120](SO4)5.6Cl1.5(CO3)0.4 · 11H2OTrig. 3 : P3
Vishnevite(Na,K)8(Al6Si6O24)(SO4,CO3) · 2H2OHex. 6 : P63

Common AssociatesHide

Associations Based on Photo Data:
3 photos of Davyne associated with VesuvianiteCa19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9
2 photos of Davyne associated with Humite Group
2 photos of Davyne associated with KaliophiliteKAlSiO4
2 photos of Davyne associated with Cancrinite Group
2 photos of Davyne associated with Hornblende Root Name Group◻Ca2(C2+4C3+)(AlSi7O22)W2
2 photos of Davyne associated with SodaliteNa4(Si3Al3)O12Cl
2 photos of Davyne associated with Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
1 photo of Davyne associated with SpinelMgAl2O4
1 photo of Davyne associated with Garnet GroupX3Z2(SiO4)3
1 photo of Davyne associated with 'Fayalite-Forsterite Series'

Related Minerals - Strunz-mindat GroupingHide

9.FB.Perchukite-(Y)PbYAsSi2O8Mon. 2/m : B2/b
9.FB.Åsgruvanite-(Ce)Ce16Ca5Al(SiO4)6(AsO3)8(CO3)2Cl4F3(OH)2Trig. 3m(32/m) : P3m1
9.FB.SteudeliteNa3(K17Ca7)Ca4(Al24Si24O96)(SO3)6F6 · 4H2OHex. 6m2 : P62c
9.FB.Wenlanzhangite-(Y)Y2V3+2V4+2(SiO4)2O4(OH)4Tric. 1 : P1
9.FB.SlyudyankaiteNa28Ca4(Si24Al24O96)(SO4)6(S6)1/3(CO2) · 2H2OTric. 1 : P1
9.FB.Bolotinaite(Na7◻)(Al6Si6O24)F · 4H2OIso. 43m : I43m
9.FB.SapozhnikoviteNa8(Al6Si6O24)(HS)2Iso. 43m : P43n
9.FB.BetziteNa6Ca2(Al6Si6O24)Cl4Hex. 6 : P63
9.FB.05Quadridavyne(Na,K)6Ca2(Al6Si6O24)Cl4Hex. 6/m : P63/m
9.FB.05SulfhydrylbystriteNa5K2Ca[Al6Si6O24](S5)2(SH)Trig. 3m : P31c
9.FB.05Marinellite(Na,K)42Ca6(Al6Si6O24)6(SO4)8Cl2 · 3H2OTrig. 3m : P31c
9.FB.05Afghanite(Na,K)22Ca10(Si24Al24O96)(SO4)6Cl6Trig. 3m : P31c
9.FB.05Bystrite(Na,K)7Ca(Al6Si6O24)(S5)ClTrig. 3m : P31c
9.FB.05Franzinite(Na,K)6Ca2(Al6Si6O24)(SO4)2 · 0.5H2OHex.
9.FB.05KyanoxaliteNa7(Al6-xSi6+xO24)(C2O4)0.5+x · 5H2O (0 < x < 0.5)Hex. 6 : P63
9.FB.05Vishnevite(Na,K)8(Al6Si6O24)(SO4,CO3) · 2H2OHex. 6 : P63
9.FB.05Farneseite(Na,Ca,K)56(Al6Si6O24)7(SO4)12 · 6H2OHex. 6/m : P63/m
9.FB.05Alloriite(Na,Ca,K)26Ca4(Al6Si6O24)4(SO4)6Cl6Trig. 3m : P31c
9.FB.05Liottite(Na,K)16Ca8(Al6Si6O24)3(SO4)5Cl4Hex. 6 : P6
9.FB.05DepmeieriteNa8(Al6Si6O24)(PO4,CO3)1-x · 3H2O (x<0.5)Hex. 6 : P63
9.FB.05Biachellaite(Na,Ca,K)8(Al6Si6O24)(SO4)2(OH)0.5 · H2OTrig. 3 : P3
9.FB.05Cancrinite(Na,Ca,◻)8(Al6Si6O24)(CO3,SO4)2 · 2H2OHex. 6 : P63
9.FB.05CancrisiliteNa7(Al5Si7O24)(CO3) · 3H2OHex. 6mm : P63mc
9.FB.05Fantappièite[Na82.5Ca33K16.5](Si99Al99O396)(SO4)33 · 4H2OTrig. 3 : R3
9.FB.05CarbobystriteNa8(Al6Si6O24)(CO3) · 3.5H2OTrig. 3m : P31c
9.FB.05MicrosommiteNa4K2Ca2(Al6Si6O24)(SO4)Cl2Hex. 622 : P6322
9.FB.05PitiglianoiteNa6K2(Al6Si6O24)(SO4) · 2H2OHex. 6 : P63
9.FB.05Tounkite(Na,Ca,K)8(Si6Al6)O24(SO4)2Cl · 0.5H2OHex. 622 : P6222
9.FB.05Balliranoite(Na,K)6Ca2(Si6Al6O24)Cl2(CO3)Hex. 6 : P63
9.FB.05Giuseppettite(Na,K,Ca)7-8(Al6Si6O24)(SO4,Cl)1-2Trig. 3m : P31c
9.FB.05Sacrofanite(Na61K19Ca32)(Si84Al84O336)(SO4)26Cl2F6 · 2H2OHex.
9.FB.05KircheriteNa5Ca2K(Al6Si6O24)(SO4)2 · 0.33H2OTrig. 32 : R32
9.FB.05HydroxycancriniteNa8(Al6Si6O24)(OH)2 · 2H2OHex. 6 : P63
9.FB.10HaüyneNa3Ca(Si3Al3)O12(SO4)Iso. 43m : P43n
9.FB.10LazuriteNa7Ca(Al6Si6O24)(SO4)(S3) · H2OIso. 43m : P43n
9.FB.10DanaliteBe3Fe2+4(SiO4)3SIso. 43m : P43n
9.FB.10HelvineBe3Mn2+4(SiO4)3SIso. 43m : P43n
9.FB.10KamaishiliteCa2(Al2SiO6)(OH)2Tet.
9.FB.10SodaliteNa4(Si3Al3)O12ClIso. 43m : P43n
9.FB.10NoseanNa8(Al6Si6O24)(SO4) · H2OIso. 43m : P43n
9.FB.10GenthelviteBe3Zn4(SiO4)3SIso. 43m : P43n
9.FB.10BicchuliteCa2(Al2SiO6)(OH)2Iso. 43m : I43m
9.FB.10Tsaregorodtsevite(N(CH3)4)(AlSi5O12)Orth. 222 : I222
9.FB.10VladimirivanoviteNa6Ca2(Al6Si6O24)(SO4,S3,S2,Cl)2 · H2OOrth. mmm(2/m2/m2/m)
9.FB.10Tugtupite(BeAlSi)Na4(SiO4)3ClTet. 4 : I4
9.FB.15MarialiteNa4Al3Si9O24ClTet. 4/m : I4/m
9.FB.15MeioniteCa4Al6Si6O24CO3Tet. 4/m : I4/m
9.FB.15Silvialite(Ca,Na)4(Al6Si6O24)(SO4,CO3)Tet. 4/m : I4/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.

Internet Links for DavyneHide

References for DavyneHide

Reference List:

Localities for DavyneHide

Showing 28 localities.

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.
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Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Egypt
 
  • Red Sea Governorate
Bonaccorsi et al. (1991)
Germany
 
  • Rhineland-Palatinate
    • Ahrweiler
      • Brohltal
        • Brenk
Blaß et al. (2001) +1 other reference
        • Burgbrohl
Blaß et al. (1992)
        • Glees
Brauns +1 other reference
        • Spessart
          • Hannebach
Hentschel (1983)
    • Mayen-Koblenz
      • Mendig
        • Mendig
Brauns +1 other reference
Brauns +1 other reference
          • Wingertsberg
Brauns +1 other reference
      • Pellenz
        • Kruft
Brauns +1 other reference
        • Nickenich
Hentschel (1983)
      • Vordereifel
        • Ettringen
Blaß et al. (2001)
Italy
 
  • Campania
    • Metropolitan City of Naples
      • Ercolano
        • San Vito
      • Monte di Procida
Fedele L. et al. (2006)
Bonaccorsi et al. (1990)
[BINON J. et al. (2004)
      • Pollena Trocchia
Carati (1982)
M. Carati - Guida alla mineralogia ...
Russo (2010)
      • Terzigno
Luigi Chiappino data
Panikorovskii et al. (2017)
  • Lazio
    • Metropolitan City of Rome Capital
      • Campagnano di Roma
Liotti L. (1983)
      • Sacrofano
Stoppani et al. (1982)
    • Viterbo Province
Stoppani et al. (1982)
www.mindat.org (n.d.)
      • Viterbo
Fantappiè L. (1896) +2 other references
  • Tuscany
    • Grosseto Province
      • Pitigliano
Liotti (1991)
Russia
 
  • Sakhalin Oblast
    • Kuril Islands
      • Kurilsky District
        • Iturup Island
Ganino et al. (2019)
 
and/or  
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