Giuseppettite Mineral Data

Giuseppettite Mineral Data +

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General Giuseppettite Information

Chemical Formula:

[Na42K16Ca6]S64Si48Al48O192(SO4)10Cl2·5H2O

Composition:

Molecular Weight = 8,668.33 gm

Potassium 7.22 % K 8.69 % K₂O

Sodium 11.14 % Na 15.02 % Na₂O

Calcium 2.77 % Ca 3.88 % CaO

Aluminum 14.94 % Al 28.23 % Al₂O₃

Silicon 15.55 % Si 33.27 % SiO₂

Hydrogen 0.12 % H 1.04 % H₂O

Sulfur 3.70 % S 9.24 % SO₃

Chlorine 0.82 % Cl 0.82 % Cl

- % Cl -0.18 % -O=Cl₂

Oxygen 43.74 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₄₂K₁₆Ca₆Al₄₈Si₄₈O₁₉₂(SO₄)₁₀Cl₂·5(H₂O)

Environment:

As veinlets in a block of sanidinite volcanic ejecta.

IMA Status:

Approved IMA 1981

Locality:

At Sacrafano, in the Biachella Valley, Lazio, Italy. Link to MinDat.org Location Data.

Name Origin:

Named for Giuseppe Giuseppetti, Professor of Mineralogy, University of Pavia, Pava, Italy.

Giuseppettite Image

Images:

Giuseppettite

Comments: Pale bluish-violet giuseppettite crystals.
Location: Sacrofano, Campagnano, Lazio, Italy. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Giuseppettite Crystallography

Axial Ratios:

a:c = 1:3.28687

Cell Dimensions:

a = 12.856, c = 42.256, Z = 1; V = 6,048.27 Den(Calc)= 2.38

Crystal System:

Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: P 3₁c

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

By Intensity(I/I_o): 3.712(1), 3.446(0.8), 3.126(0.7),

Physical Properties of Giuseppettite

Cleavage:

None

Color:

Light violet blue.

Density:

2.35

Diaphaniety:

Transparent to Translucent

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Hardness:

6-7 - Orthoclase-Quartz

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Giuseppettite

Gladstone-Dale:

CI meas= -0.042 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.029 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2097,KPDmeas= 0.2123,KC= 0.2038

Optical Data:

Uniaxial (+), w=1.491, e=1.507, bire=0.0160.

Calculated Properties of Giuseppettite

Electron Density:

r_electron=2.35 gm/cc
note: r_{Giuseppettite}=2.38 gm/cc.

Fermion Index

Fermion Index = 0.00779
Boson Index = 0.99221

Photoelectric:

PE_{Giuseppettite}= 2.55 barns/electron
U=PE_{Giuseppettite} x r_electron= 6.00 barns/cc.

Radioactivity:

GRapi = 102.89 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Giuseppettite - barely detectable

Giuseppettite Classification

Dana Class:

76.2.5.7 (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.09-40 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 Giuseppettite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990, AmMin, 90:771) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Giuseppettite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris

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Print or Cut-and-Paste your Giuseppettite Specimen Label here :

Giuseppettite

[Na42K16Ca6]S64Si48Al48O192(SO4)10Cl2·5H2O
Dana No: 76.2.5.7 Strunz No: VIII/J.09-40
Locality:

Notes: