Davyne Mineral Data
General Davyne Information
Chemical Formula:
Na4K2Ca2Si6Al6O24(SO4)Cl2
Composition:
Molecular Weight = 1,084.25 gm
Potassium 5.63 % K 6.78 % K2 O
Sodium 7.51 % Na 10.12 % Na2 O
Calcium 8.98 % Ca 12.57 % CaO
Aluminum 15.43 % Al 29.15 % Al2 O3
Silicon 15.02 % Si 32.14 % SiO2
Sulfur 1.77 % S 4.43 % SO3
Chlorine 6.70 % Cl 6.70 % Cl
- %
Cl -1.51 % -O=Cl2
Oxygen 38.96 % O
______ ______
100.00 % 100.38 % = TOTAL OXIDE
Empirical Formula:
Na3.54 Ca2.43 K1.56 Al6.2 Si5.8 O24 Cl2.05 (SO4 )0.6
Environment:
In volcanic ejecta and in leucite-rich lavas.
IMA Status:
Valid Species (Pre-IMA) 1825
Locality:
Mte. Somma, Vesuvius, Italy. Link to MinDat.org Location Data.
Name Origin:
Named for Sir Humphrey Davy (1778-1829), famous English chemist who discovered the following elements: B, Ba, Ca, K, Mg, Na, and Sr.
Name Pronunciation:
Davyne
Synonym:
ICSD 68940
PDF 20-379
Davyne Image
Images:
Davyne Crystallography
Axial Ratios:
a:c = 1:0.42251
Cell Dimensions:
a = 12.705, c = 5.368, Z = 1; V = 750.40 Den(Calc)= 2.40
Crystal System:
Hexagonal - Dipyramidal H-M Symbol (6/m) Space Group: P 63 /m
X Ray Diffraction:
By Intensity(I/Io ): 3.28(1), 3.67(1), 4.8(1),
Physical Properties of Davyne
Cleavage:
{1010} Perfect, {0001} Indistinct
Color:
Colorless, White.
Density:
2.42 - 2.53, Average = 2.47
Diaphaneity:
Transparent
Fracture:
Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Habit:
Hexagonal - Six-sided crystal shape in cross-section or habit.
Habit:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Hardness:
6 - Orthoclase
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Davyne
Gladstone-Dale:
CI meas = 0.021 (Excellent) - where the CI = (1-KPDmeas /KC ) CI calc = -0.009 (Superior) - where the CI = (1-KPDcalc /KC )
KPDcalc = 0.2171,KPDmeas = 0.2105,KC = 0.2151 Ncalc = 1.52 - 1.54
Optical Data:
Uniaxial (+), w=1.518-1.522, e=1.517-1.527, bire=0.0010-0.0050.
Calculated Properties of Davyne
Electron Density:
Bulk Density (Electron Density)=2.37 gm/cc note: Specific Gravity of Davyne =2.40 gm/cc.
Fermion Index:
Fermion Index = 0.0074642155 Boson Index = 0.9925357845
Photoelectric:
PEDavyne = 3.36 barns/electronU=PEDavyne x r electron = 7.95 barns/cc.
Radioactivity:
GRapi = 80.02 (Gamma Ray American Petroleum Institute Units)
Concentration of Davyne per GRapi unit = 1.25 (%)
Estimated Radioactivity from Davyne - barely detectable
Davyne Classification
Dana Class:
76.02.05.05 (76) Tectosilicate Al-Si Framework
(76.02) Feldspathoids and related species
(76.02.05) Cancrinite group
76.02.05.01 Afghanite (Na,Ca,K)8(Si,Al)12O24(SO4,Cl,CO3)3•(H2O) P 63 /mmc, P 63 mc, or P 6 2c Hex
76.02.05.02 Bystrite (Na,K)7Ca(Si6Al6)O24S4.5•(H2O) P 31 c 3m
76.02.05.03 Cancrinite Na6Ca2Al6Si6O24(CO3)2 P 63 6
76.02.05.04 Cancrisilite Na7Al5Si7O24(C03)•3(H2O) P 63 6
76.02.05.05 Davyne Na4K2Ca2Si6Al6O24(SO4)Cl2 P 63 /m 6/m
76.02.05.06 Franzinite [(Na,K)30Ca10][Si30Al30O120](SO4)10•2(H2O) P 32 1 3 2
76.02.05.07 Giuseppettite [Na42K16Ca6]S64Si48Al48O192(SO4)10Cl2•5H2O P 31 c 3m
76.02.05.08 Hydroxycancrinite Na4(AlSiO4)3(OH)•(H2O) P 63 6
76.02.05.09 Liottite (Ca,Na,K)8(Si,Al)12O24[(SO4),(CO3),Cl,OH]4•(H2O) P 6 m2 6 m2
76.02.05.10 Microsommite (Na,Ca,K)7-8(Si,Al)12O24(Cl,SO4)2-3 P 63 22 6 2 2
76.02.05.11 Pitiglianoite Na6K2Si6Al6O24(SO4)•2(H2O) P 63 6
76.02.05.12 Quadridavyne (Na,K)6Ca2Al6Si6O24Cl4 P 63 /m 6/m
76.02.05.13 Sacrofanite (Na,Ca,K)9Si6Al6O24[(OH),(SO4),(CO3),Cl)]4•n(H2O) P 63 /mmc ? 6/m 2/m 2/m
76.02.05.14 Tounkite (Na,Ca,K)8Al6Si6O24(SO4)2Cl•(H2O) P 62 22 6 2 2
76.02.05.15 Vishnevite (Na,Ca,K)6(Si,Al)12O24[(SO4),(CO3),Cl2]2-4•n(H2O) P 63 22 6 2 2
76.02.05.16 Wenkite Ba4Ca6(Si,Al)20O39(OH)2(SO4)3•n(H2O)(?) P 6 2m 6 m2
76.02.05.17 Marinellite ! [(Na,K)42Ca6](Si36Al36O144)(SO4)8Cl2•6(H2O) P 31 c or P 2c Trig
76.02.05.18 Farneseite ! (Na37K9Ca10)S56(Si42Al42)S84O168(SO4)12•6(H2O) P 63 /m 6/m 2/m 2/m
76.02.05.19 Alloriite ! Na5K1.5Ca(Si6Al6O24)(SO4)(OH)0.5•H2O P 31 c 3m
76.02.05.20 Biachellaite (Na,Ca,K)8(Si6Al6O24)(SO4)2(OH)0.5•H2O P 3 3
76.02.05.21 IMA2008-006 ! [Na82.5Ca33K16.5](Si99Al99O396)(SO4)33•4H2O P 3 3
76.02.05.22 Kyanoxalite ! Na7(Al5-6Si6-7O24)(C2O4)0.5-1.0•5H2O P 63 6
76.02.05.23 IMA2008-065 ! (Na,K)6Ca2(Si6Al6O24)Cl2(CO3) P 63 6
Strunz Class:
09.FB.05 09 - SILICATES (Germanates)
09.F - Tektosilicates without Zeolitic H2O
09.FB -Tektosilicates with additional anions
09.FB.05 Bystrite (Na,K)7Ca(Si6Al6)O24S4.5•(H2O) P 31 c 3m
09.FB.05 Afghanite (Na,Ca,K)8(Si,Al)12O24(SO4,Cl,CO3)3•(H2O) P 63 /mmc, P 63 mc, or P 6 2c Hex
09.FB.05 Cancrisilite Na7Al5Si7O24(C03)•3(H2O) P 63 6
09.FB.05 Cancrinite Na6Ca2Al6Si6O24(CO3)2 P 63 6
09.FB.05 Hydroxycancrinite Na4(AlSiO4)3(OH)•(H2O) P 63 6
09.FB.05 Franzinite [(Na,K)30Ca10][Si30Al30O120](SO4)10•2(H2O) P 32 1 3 2
09.FB.05 Liottite (Ca,Na,K)8(Si,Al)12O24[(SO4),(CO3),Cl,OH]4•(H2O) P 6 m2 6 m2
09.FB.05 Davyne Na4K2Ca2Si6Al6O24(SO4)Cl2 P 63 /m 6/m
09.FB.05 Giuseppettite [Na42K16Ca6]S64Si48Al48O192(SO4)10Cl2•5H2O P 31 c 3m
09.FB.05 Quadridavyne (Na,K)6Ca2Al6Si6O24Cl4 P 63 /m 6/m
09.FB.05 Pitiglianoite Na6K2Si6Al6O24(SO4)•2(H2O) P 63 6
09.FB.05 Microsommite (Na,Ca,K)7-8(Si,Al)12O24(Cl,SO4)2-3 P 63 22 6 2 2
09.FB.05 Vishnevite (Na,Ca,K)6(Si,Al)12O24[(SO4),(CO3),Cl2]2-4•n(H2O) P 63 22 6 2 2
09.FB.05 Sacrofanite (Na,Ca,K)9Si6Al6O24[(OH),(SO4),(CO3),Cl)]4•n(H2O) P 63 /mmc ? 6/m 2/m 2/m
09.FB.05 Marinellite ! [(Na,K)42Ca6](Si36Al36O144)(SO4)8Cl2•6(H2O) P 31 c or P 2c Trig
09.FB.05 Tounkite (Na,Ca,K)8Al6Si6O24(SO4)2Cl•(H2O) P 62 22 6 2 2
09.FB.05 IMA2008-065 ! (Na,K)6Ca2(Si6Al6O24)Cl2(CO3) P 63 6
09.FB.05 Farneseite ! (Na37K9Ca10)S56(Si42Al42)S84O168(SO4)12•6(H2O) P 63 /m 6/m 2/m 2/m
09.FB.05 Biachellaite (Na,Ca,K)8(Si6Al6O24)(SO4)2(OH)0.5•H2O P 3 3
09.FB.05 IMA2008-006 ! [Na82.5Ca33K16.5](Si99Al99O396)(SO4)33•4H2O P 3 3
09.FB.05 Alloriite ! Na5K1.5Ca(Si6Al6O24)(SO4)(OH)0.5•H2O P 31 c 3m
Other Davyne Information
References:
NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
See Also:
Links to other databases for Davyne :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST
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Davyne
Na4K2Ca2Si6Al6O24(SO4)Cl2
Dana No: 76.02.05.05 Strunz No: 09.FB.05
Locality:
Notes:
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