Pitiglianoite Mineral Data

Pitiglianoite Mineral Data +

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General Pitiglianoite Information

Chemical Formula:

Na6K2Si6Al6O24(SO4)·2(H2O)

Composition:

Molecular Weight = 1,062.62 gm

Potassium 7.36 % K 8.86 % K₂O

Sodium 12.98 % Na 17.50 % Na₂O

Aluminum 15.23 % Al 28.79 % Al₂O₃

Silicon 15.86 % Si 33.93 % SiO₂

Hydrogen 0.38 % H 3.39 % H₂O

Sulfur 3.02 % S 7.53 % SO₃

Oxygen 45.17 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

K₂Na₆Si₆Al₆O₂₄(SO₄)·2(H₂O)

Environment:

In a pumice quarry, in ejected blocks showing metasomatic effects. A product of reaction between trachitic magma and carbonate and sulfate rock in the volcanic vent.

IMA Status:

Approved IMA 1991

Locality:

Casa Collina, Ptigliano, Tuscany, Italy. Link to MinDat.org Location Data.

Name Origin:

Named after the locality.

Synonym:

ICSD 66463

IMA1990-012

PDF 46-1390

Pitiglianoite Image

Images:

Pitiglianoite

Comments: Colorless, prismatic crystals of pitiglianoite.
Location: Monte Cavallucio, Sacrofano, Campagnano, Lazio, Italy. Scale: Picture size 2.5 mm.
© Thomas Witzke / Abraxas-Verlag

Pitiglianoite Crystallography

Axial Ratios:

a:c = 1:0.23556

Cell Dimensions:

a = 22.121, c = 5.211, Z = 3; V = 2,208.32 Den(Calc)= 2.40

Crystal System:

Hexagonal - PyramidalH-M Symbol (6) Space Group: P 6₃

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

By Intensity(I/I_o): 3.27(1), 4.77(1), 6.39(0.75),2.36(0.5), 2.77(0.5), 3.69(0.5),

Crystal Structure:

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Merlino S , Mellini M , Bonaccorsi E , Pasero M , Leoni L , Orlandi P , American Mineralogist , 76 (1991) p.2003-2008, Pitiglianoite, a new feldspathoid from southern Tuscany, Italy: Chemical, composition and crystal structure

Physical Properties of Pitiglianoite

Cleavage:

[???] Indistinct

Color:

Colorless.

Density:

2.37

Diaphaniety:

Transparent

Fracture:

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

Habit:

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

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Pitiglianoite

Gladstone-Dale:

CI meas= -0.04 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.027 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2113,KPDmeas= 0.2139,KC= 0.2056

Optical Data:

Uniaxial (-), e=1.506, w=1.508, bire=0.0020.

Calculated Properties of Pitiglianoite

Electron Density:

r_electron=2.38 gm/cc
note: r_{Pitiglianoite}=2.40 gm/cc.

Fermion Index

Fermion Index = 0.00785
Boson Index = 0.99215

Photoelectric:

PE_{Pitiglianoite}= 2.18 barns/electron
U=PE_{Pitiglianoite} x r_electron= 5.18 barns/cc.

Radioactivity:

GRapi = 105.13 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Pitiglianoite - barely detectable

Pitiglianoite Classification

Dana Class:

76.2.5.11 (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.09-65 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 Pitiglianoite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

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Pitiglianoite

Na6K2Si6Al6O24(SO4)·2(H2O)
Dana No: 76.2.5.11 Strunz No: VIII/J.09-65
Locality:

Notes: