Quadridavyne Mineral Data

Quadridavyne Mineral Data +

General Quadridavyne Information

Chemical Formula:

(Na,K)6Ca2Al6Si6O24Cl4

Composition:

Molecular Weight = 1,103.19 gm

Potassium 4.96 % K 5.98 % K₂O

Sodium 8.34 % Na 11.24 % Na₂O

Calcium 7.99 % Ca 11.18 % CaO

Aluminum 14.67 % Al 27.73 % Al₂O₃

Silicon 15.28 % Si 32.68 % SiO₂

Sulfur 0.58 % S 1.45 % SO₃

Chlorine 12.21 % Cl 12.21 % Cl

- % Cl -2.76 % -O=Cl₂

Oxygen 35.97 % O

______ ______

100.00 % 99.71 % = TOTAL OXIDE

Empirical Formula:

Na₄K_1.4Ca_2.2Al₆Si₆O₂₄Cl_3.8(SO₄)_0.2

Environment:

In volcanic ash from the 1906 eruption of Vesuvius.

IMA Status:

Approved IMA 1994

Locality:

From Ottaviano, near Naples, Campania, Italy. Link to MinDat.org Location Data.

Name Origin:

From the Latin "quad" for four, as the mineral has four times the unit cell volume of the related mineral species davyne.

Synonym:

ICSD 64812

IMA1990-054

PDF 46-1474

Quadridavyne Image

Images:

Quadridavyne

Comments: Colorless hexagonal crystals of quadridavyne.
Location: Ettringer Bellerberg, Ettringen, near Mayen, Eifel Mts, Rhineland-Palatinate, Germany. Scale: Picture size 3 mm.
© Thomas Witzke / Abraxas-Verlag

Quadridavyne Crystallography

Axial Ratios:

a:c = 1:0.20841

Cell Dimensions:

a = 25.771, c = 5.371, Z = 4; V = 3,089.22 Den(Calc)= 2.37

Crystal System:

Hexagonal - DipyramidalH-M Symbol (6/m) Space Group: P 6₃/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.31(1), 3.71(1), 4.85(0.7),

Crystal Structure:

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Bonaccorsi E , Merlino S , Orlandi P , Pasero M , Vezzalini G , European Journal of Mineralogy , 6 (1994) p.481-487, Quadridavyne, [(Na,K)6Cl2][Ca2Cl2][Si6Al6O24], a new feldspathoid, mineral from Vesuvius area, Note: Cl1 y-coordinate altered, Locality: Vesuvius, Italy

Physical Properties of Quadridavyne

Cleavage:

[0001] Perfect, [1120] Distinct

Color:

Colorless.

Density:

2.335

Diaphaniety:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Hexagonal - Six-sided crystal shape in cross-section or habit.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Quadridavyne

Gladstone-Dale:

CI meas= -0.018 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.003 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2238,KPDmeas= 0.2272,KC= 0.2231

Optical Data:

Uniaxial (+), w=1.529, e=1.532, bire=0.0030.

Calculated Properties of Quadridavyne

Electron Density:

r_electron=2.33 gm/cc
note: r_Quadridavyne=2.37 gm/cc.

Fermion Index

Fermion Index = 0.00746
Boson Index = 0.99254

Photoelectric:

PE_Quadridavyne= 3.46 barns/electron
U=PE_Quadridavyne x r_electron= 8.08 barns/cc.

Radioactivity:

GRapi = 70.43 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Quadridavyne - barely detectable

Quadridavyne Classification

Dana Class:

76.2.5.12 (76)Tectosilicate Al-Si Framework

(76.2)Feldspathoids and related species

(76.2.5)Cancrinite group

76.2.5.1 Afghanite (Na,Ca,K)8(Si,Al)12O24(SO4,Cl,CO3)3·(H2O) P 6₃/mmc, P 6₃mc, or P 62c Hex

76.2.5.2 Bystrite (Na,K)7Ca(Si6Al6)O24S4.5·(H2O) P 3₁c 3m

76.2.5.3 Cancrinite Na6Ca2Al6Si6O24(CO3)2 P 6₃ 6

76.2.5.4 Cancrisilite Na7Al5Si7O24(C03)·3(H2O) P 6₃ 6

76.2.5.5 Davyne Na4K2Ca2Si6Al6O24(SO4)Cl2 P 6₃/m 6/m

76.2.5.6 Franzinite [(Na,K)30Ca10][Si30Al30O120](SO4)10·2(H2O) P 3₂1 3 2

76.2.5.7 Giuseppettite [Na42K16Ca6]S64Si48Al48O192(SO4)10Cl2·5H2O P 3₁c 3m

76.2.5.8 Hydroxycancrinite Na4(AlSiO4)3(OH)·(H2O) P 6₃ 6

76.2.5.9 Liottite (Ca,Na,K)8(Si,Al)12O24[(SO4),(CO3),Cl,OH]4·(H2O) P 6m2 6 m2

76.2.5.10 Microsommite (Na,Ca,K)7-8(Si,Al)12O24(Cl,SO4)2-3 P 6₃22 6 2 2

76.2.5.11 Pitiglianoite Na6K2Si6Al6O24(SO4)·2(H2O) P 6₃ 6

76.2.5.12 Quadridavyne (Na,K)6Ca2Al6Si6O24Cl4 P 6₃/m 6/m

76.2.5.13 Sacrofanite (Na,Ca,K)9Si6Al6O24[(OH),(SO4),(CO3),Cl)]4·n(H2O) P 6₃/mmc ? 6/m 2/m 2/m

76.2.5.14 Tounkite (Na,Ca,K)8Al6Si6O24(SO4)2Cl·(H2O) P 6₂22 6 2 2

76.2.5.15 Vishnevite (Na,Ca,K)6(Si,Al)12O24[(SO4),(CO3),Cl2]2-4·n(H2O) P 6₃22 6 2 2

76.2.5.16 Wenkite Ba4Ca6(Si,Al)20O39(OH)2(SO4)3·n(H2O)(?) P 62m 6 m2

76.2.5.17 Marinellite! [(Na,K)42Ca6](Si36Al36O144)(SO4)8Cl2·6(H2O) P 3₁c or P 2c Trig

76.2.5.18 IMA2004-043! (Na37K9Ca10)S56(Si42Al42)S84O168(SO4)12·6(H2O) P 6₃/m 6/m 2/m 2/m

Strunz Class:

VIII/J.09-25 VIII - Silicates

VIII/J - Tectosilicates (network) with anions unfamiliar to the tetraheders

VIII/J.09 - Cancrinite group

VIII/J.09-05 Hydroxycancrinite Na4(AlSiO4)3(OH)·(H2O) P 6₃ 6

VIII/J.09-10 Cancrinite Na6Ca2Al6Si6O24(CO3)2 P 6₃ 6

VIII/J.09-15 Cancrisilite Na7Al5Si7O24(C03)·3(H2O) P 6₃ 6

VIII/J.09-20 Davyne Na4K2Ca2Si6Al6O24(SO4)Cl2 P 6₃/m 6/m

VIII/J.09-25 Quadridavyne (Na,K)6Ca2Al6Si6O24Cl4 P 6₃/m 6/m

VIII/J.09-30 Microsommite (Na,Ca,K)7-8(Si,Al)12O24(Cl,SO4)2-3 P 6₃22 6 2 2

VIII/J.09-40 Giuseppettite [Na42K16Ca6]S64Si48Al48O192(SO4)10Cl2·5H2O P 3₁c 3m

VIII/J.09-45 Bystrite (Na,K)7Ca(Si6Al6)O24S4.5·(H2O) P 3₁c 3m

VIII/J.09-50 Afghanite (Na,Ca,K)8(Si,Al)12O24(SO4,Cl,CO3)3·(H2O) P 6₃/mmc, P 6₃mc, or P 62c Hex

VIII/J.09-55 Tounkite (Na,Ca,K)8Al6Si6O24(SO4)2Cl·(H2O) P 6₂22 6 2 2

VIII/J.09-60 Sacrofanite (Na,Ca,K)9Si6Al6O24[(OH),(SO4),(CO3),Cl)]4·n(H2O) P 6₃/mmc ? 6/m 2/m 2/m

VIII/J.09-65 Pitiglianoite Na6K2Si6Al6O24(SO4)·2(H2O) P 6₃ 6

VIII/J.09-70 Vishnevite (Na,Ca,K)6(Si,Al)12O24[(SO4),(CO3),Cl2]2-4·n(H2O) P 6₃22 6 2 2

VIII/J.09-80 Franzinite [(Na,K)30Ca10][Si30Al30O120](SO4)10·2(H2O) P 3₂1 3 2

VIII/J.09-90 Liottite (Ca,Na,K)8(Si,Al)12O24[(SO4),(CO3),Cl,OH]4·(H2O) P 6m2 6 m2

VIII/J.09-100 Wenkite Ba4Ca6(Si,Al)20O39(OH)2(SO4)3·n(H2O)(?) P 62m 6 m2

Other Quadridavyne Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Am.Min.,Vol.80,p631,1995) OPTIC PROP.(Am.Min.,Vol.80,p631,1995)

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Quadridavyne

(Na,K)6Ca2Al6Si6O24Cl4
Dana No: 76.2.5.12 Strunz No: VIII/J.09-25
Locality:

Notes: