Franzinite Mineral Data

Franzinite Mineral Data +

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General Franzinite Information

Chemical Formula:

[(Na,K)30Ca10][Si30Al30O120](SO4)10·2(H2O)

Composition:

Molecular Weight = 5,804.06 gm

Potassium 6.06 % K 7.30 % K₂O

Sodium 8.32 % Na 11.21 % Na₂O

Calcium 6.91 % Ca 9.66 % CaO

Aluminum 13.95 % Al 26.35 % Al₂O₃

Silicon 14.52 % Si 31.06 % SiO₂

Hydrogen 0.07 % H 0.62 % H₂O

Sulfur 5.52 % S 13.79 % SO₃

Oxygen 44.66 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₂₁K₉Ca₁₀Si₃₀Al₃₀O₁₂₀(SO₄)₁₀·2(H₂O)

Environment:

In ejected metasomatized pumice blocks, thought to be the product of a syntectic process between a trachytic magma and carbonate rocks at the volcanic vent.

IMA Status:

Approved IMA 1977

Locality:

In Italy, in the Pitigliano quarry, near Grosseto, Tuscany; and at Sacrofano and Ariccia, near Rome, Lazio. Link to MinDat.org Location Data.

Name Origin:

For Marco Franzini, Professor of Mineralogy, University of Pisa, Pisa, Italy.

Synonym:

ICSD 89863

PDF 30-1170

Franzinite Image

Images:

Franzinite

Comments: Opaque white platy crystals of franzinite on brown vesuvianite crystals.
Location: Pitigliano, Grosseto, Tuscany, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Franzinite Crystallography

Axial Ratios:

a:c = 1:2.056

Cell Dimensions:

a = 12.91, c = 26.543, Z = 1; V = 3,831.19 Den(Calc)= 2.52

Crystal System:

Trigonal - TrapezohedralH-M Symbol (3 2) Space Group: P 3₂1

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

By Intensity(I/I_o): 3.72(1), 3.59(0.43), 3.81(0.42),

Crystal Structure:

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Ballirano P , Bonaccorsi E , Maras A , Merlino S , The Canadian Mineralogist , 38 (2000) p.657-668, The crystal structure of franzinite, the ten-layer mineral of, the cancrinite group

Physical Properties of Franzinite

Cleavage:

[0001] Distinct

Color:

Pearl white.

Density:

2.49

Diaphaniety:

Transparent to Translucent

Habit:

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

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Franzinite

Gladstone-Dale:

CI meas= -0.018 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.006 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2028,KPDmeas= 0.2052,KC= 0.2016

Optical Data:

Uniaxial (+), w=1.51, e=1.512, bire=0.0020.

Calculated Properties of Franzinite

Electron Density:

r_electron=2.49 gm/cc
note: r_Franzinite=2.52 gm/cc.

Fermion Index

Fermion Index = 0.0075
Boson Index = 0.9925

Photoelectric:

PE_Franzinite= 2.89 barns/electron
U=PE_Franzinite x r_electron= 7.21 barns/cc.

Radioactivity:

GRapi = 86.57 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Franzinite - barely detectable

Franzinite Classification

Dana Class:

76.2.5.6 (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.09-80 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 Franzinite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(AmMin, Vol 86) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Franzinite

[(Na,K)30Ca10][Si30Al30O120](SO4)10·2(H2O)
Dana No: 76.2.5.6 Strunz No: VIII/J.09-80
Locality:

Notes: