General Pitiglianoite Information
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Chemical Formula: |
Na6K2Si6Al6O24(SO4)·2(H2O) |
Composition: |
Molecular Weight = 1,062.62 gm |
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Potassium 7.36 % K 8.86 % K2O |
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Sodium 12.98 % Na 17.50 % Na2O |
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Aluminum 15.23 % Al 28.79 % Al2O3 |
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Silicon 15.86 % Si 33.93 % SiO2 |
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Hydrogen 0.38 % H 3.39 % H2O |
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Sulfur 3.02 % S 7.53 % SO3 |
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Oxygen 45.17 % O |
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______ ______ |
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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 |
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IMA1990-012 |
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PDF 46-1390 |
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Pitiglianoite Image |
Images:
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Pitiglianoite Crystallography
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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 |
X Ray Diffraction: |
By Intensity(I/Io): 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
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Physical Properties of Pitiglianoite
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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 |
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Optical Properties of Pitiglianoite
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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. |
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Calculated Properties of Pitiglianoite
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Electron Density: |
relectron=2.38 gm/cc note: rPitiglianoite =2.40 gm/cc. |
Fermion Index |
Fermion Index = 0.00785 Boson Index = 0.99215 |
Photoelectric: |
PEPitiglianoite = 2.18 barns/electron U=PEPitiglianoite x relectron= 5.18 barns/cc. |
Radioactivity: |
GRapi = 105.13 (Gamma Ray American Petroleum Institute Units)
Estimated Radioactivity from Pitiglianoite - barely detectable
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Pitiglianoite Classification
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Dana Class: |
76.2.5.11 (76)Tectosilicate Al-Si Framework |
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(76.2)Feldspathoids and related species |
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(76.2.5)Cancrinite group |
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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 |
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76.2.5.2 Bystrite (Na,K)7Ca(Si6Al6)O24S4.5·(H2O) P 31c 3m |
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76.2.5.3 Cancrinite Na6Ca2Al6Si6O24(CO3)2 P 63 6 |
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76.2.5.4 Cancrisilite Na7Al5Si7O24(C03)·3(H2O) P 63 6 |
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76.2.5.5 Davyne Na4K2Ca2Si6Al6O24(SO4)Cl2 P 63/m 6/m |
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76.2.5.6 Franzinite [(Na,K)30Ca10][Si30Al30O120](SO4)10·2(H2O) P 321 3 2 |
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76.2.5.7 Giuseppettite [Na42K16Ca6]S64Si48Al48O192(SO4)10Cl2·5H2O P 31c 3m |
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76.2.5.8 Hydroxycancrinite Na4(AlSiO4)3(OH)·(H2O) P 63 6 |
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76.2.5.9 Liottite (Ca,Na,K)8(Si,Al)12O24[(SO4),(CO3),Cl,OH]4·(H2O) P 6m2 6 m2 |
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76.2.5.10 Microsommite (Na,Ca,K)7-8(Si,Al)12O24(Cl,SO4)2-3 P 6322 6 2 2 |
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76.2.5.11 Pitiglianoite Na6K2Si6Al6O24(SO4)·2(H2O) P 63 6 |
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76.2.5.12 Quadridavyne (Na,K)6Ca2Al6Si6O24Cl4 P 63/m 6/m |
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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 |
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76.2.5.14 Tounkite (Na,Ca,K)8Al6Si6O24(SO4)2Cl·(H2O) P 6222 6 2 2 |
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76.2.5.15 Vishnevite (Na,Ca,K)6(Si,Al)12O24[(SO4),(CO3),Cl2]2-4·n(H2O) P 6322 6 2 2 |
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76.2.5.16 Wenkite Ba4Ca6(Si,Al)20O39(OH)2(SO4)3·n(H2O)(?) P 62m 6 m2 |
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76.2.5.17 Marinellite! [(Na,K)42Ca6](Si36Al36O144)(SO4)8Cl2·6(H2O) P 31c or P 2c Trig |
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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 |
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VIII/J - Tectosilicates (network) with anions unfamiliar to the tetraheders |
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VIII/J.09 - Cancrinite group |
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VIII/J.09-05 Hydroxycancrinite Na4(AlSiO4)3(OH)·(H2O) P 63 6 |
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VIII/J.09-10 Cancrinite Na6Ca2Al6Si6O24(CO3)2 P 63 6 |
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VIII/J.09-15 Cancrisilite Na7Al5Si7O24(C03)·3(H2O) P 63 6 |
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VIII/J.09-20 Davyne Na4K2Ca2Si6Al6O24(SO4)Cl2 P 63/m 6/m |
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VIII/J.09-25 Quadridavyne (Na,K)6Ca2Al6Si6O24Cl4 P 63/m 6/m |
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VIII/J.09-30 Microsommite (Na,Ca,K)7-8(Si,Al)12O24(Cl,SO4)2-3 P 6322 6 2 2 |
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VIII/J.09-40 Giuseppettite [Na42K16Ca6]S64Si48Al48O192(SO4)10Cl2·5H2O P 31c 3m |
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VIII/J.09-45 Bystrite (Na,K)7Ca(Si6Al6)O24S4.5·(H2O) P 31c 3m |
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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 |
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VIII/J.09-55 Tounkite (Na,Ca,K)8Al6Si6O24(SO4)2Cl·(H2O) P 6222 6 2 2 |
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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 |
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VIII/J.09-65 Pitiglianoite Na6K2Si6Al6O24(SO4)·2(H2O) P 63 6 |
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VIII/J.09-70 Vishnevite (Na,Ca,K)6(Si,Al)12O24[(SO4),(CO3),Cl2]2-4·n(H2O) P 6322 6 2 2 |
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VIII/J.09-80 Franzinite [(Na,K)30Ca10][Si30Al30O120](SO4)10·2(H2O) P 321 3 2 |
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VIII/J.09-90 Liottite (Ca,Na,K)8(Si,Al)12O24[(SO4),(CO3),Cl,OH]4·(H2O) P 6m2 6 m2 |
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VIII/J.09-100 Wenkite Ba4Ca6(Si,Al)20O39(OH)2(SO4)3·n(H2O)(?) P 62m 6 m2 |
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Other Pitiglianoite Information
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References: |
NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8) |
See Also: |
Links to other databases for Pitiglianoite :
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 - WWW-MINCRYST
14 -École des Mines de Paris
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Pitiglianoite
Na6K2Si6Al6O24(SO4)·2(H2O)
Dana No: 76.2.5.11 Strunz No: VIII/J.09-65
Locality:
Notes:
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