Panunzite Mineral Data

General Panunzite Information

Chemical Formula:

(K,Na)AlSiO4

Composition:

Molecular Weight = 154.14 gm

Potassium 19.02 % K 22.92 % K₂O

Sodium 3.73 % Na 5.03 % Na₂O

Aluminum 17.51 % Al 33.08 % Al₂O₃

Silicon 18.22 % Si 38.98 % SiO₂

Oxygen 41.52 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

K_0.75Na_0.25AlSiO₄

Environment:

Within cavities of pyroxene-rich ejecta blocks that are part of a recent volcanoclastic deposit.

IMA Status:

Approved IMA 1988

Locality:

From Monte Somma and Vesuvius, Campania, Italy. Link to MinDat.org Location Data.

Name Origin:

Named for Dr. Achille Panunzi, Professor of Chemistry, University of Naples, Naples, Italy.

Name Pronunciation:

Panunzite + Pronunciation

Synonym:

ICSD 30951

PDF 31-1081

Panunzite Image

Images:

Panunzite

Comments: Translucent colorless panunzite crystals lining a small cavity in greenish volcanic matrix.
Location: Valle de Diablo, Somma-Vesuvius Complex, Campania, Italy (Type Locality for Panunzite). Scale: Crystal Size 1-1.5 mm.
© John Betts - Fine Minerals

Panunzite Crystallography

Axial Ratios:

a:c = 1:0.41695

Cell Dimensions:

a = 20.513, c = 8.553, Z = 32; V = 3,116.79 Den(Calc)= 2.63

Crystal System:

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

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

By Intensity(I/I_o): 3.071(1), 3.929(0.7), 2.558(0.4),

Crystal Structure:

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Merlino S , Franco E , Mattia C A , Pasero M , De Gennaro M , Neues Jahrbuch fur Mineralogie, Monatshefte , 1985 (1985) p.322-328, The crystal structure of panunzite (natural tetrakalsilite), Locality: Somma-Vesuvius area, Italy, Note: x(O7) and y(O11) adjusted to match reported bond lengths

Physical Properties of Panunzite

Color:

Colorless, White.

Density:

2.59

Diaphaneity:

Transparent

Hardness:

5.5-6 - Knife Blade-Orthoclase

Streak:

white

Optical Properties of Panunzite

Gladstone-Dale:

CI meas= -0.017 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.002 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2044,KPDmeas= 0.2075,KC= 0.204
Ncalc = 1.53 - 1.54

Optical Data:

Uniaxial (-), e=1.535, w=1.54, bire=0.0050.

Calculated Properties of Panunzite

Electron Density:

Bulk Density (Electron Density)=2.59 gm/cc
note: Specific Gravity of Panunzite =2.63 gm/cc.

Fermion Index:

Fermion Index = 0.0087314594
Boson Index = 0.9912685406

Photoelectric:

PE_Panunzite= 3.17 barns/electron
U=PE_Panunzite x r_electron= 8.23 barns/cc.

Radioactivity:

GRapi = 270.67 (Gamma Ray American Petroleum Institute Units)
Concentration of Panunzite per GRapi unit = 0.37 (%)

Estimated Radioactivity from Panunzite - barely detectable

Panunzite Classification

Dana Class:

76.02.01.04 (76)Tectosilicate Al-Si Framework

(76.02)Feldspathoids and related species

(76.02.01)Nepheline group

76.02.01.01 Kalsilite KAlSiO4 P 3₁c 3m

76.02.01.02 Nepheline (Na,K)AlSiO4 P 6₃ 6

76.02.01.03 Trikalsilite (K,Na)AlSiO4 P 6₃ 6

76.02.01.04 Panunzite (K,Na)AlSiO4 P 6₃ 6

76.02.01.05 Kaliophilite KAlSiO4 P 6₃22 6 2 2

76.02.01.06 Yoshiokaite (Ca8-(x/2)[](x/2)Al16-xSixO32) P 3 3

76.02.01.07 Megakalsilite! KAlSiO4 P 6₃ 6

Strunz Class:

09.FA.05 09 - SILICATES (Germanates)

09.F - Tektosilicates without Zeolitic H2O

09.FA -Tektosilicates without additional non-tetrahedral anions, (Al,B):Si = 1:1

09.FA.05 Nepheline (Na,K)AlSiO4 P 6₃ 6

09.FA.05 Kaliophilite KAlSiO4 P 6₃22 6 2 2

09.FA.05 Kalsilite KAlSiO4 P 3₁c 3m

09.FA.05 Panunzite (K,Na)AlSiO4 P 6₃ 6

09.FA.05 Trikalsilite (K,Na)AlSiO4 P 6₃ 6

09.FA.05 Megakalsilite! KAlSiO4 P 6₃ 6

09.FA.05 Yoshiokaite (Ca8-(x/2)[](x/2)Al16-xSixO32) P 3 3

Other Panunzite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Am.Min.,Vol.73,p420-421,1988) OPTIC PROP.(Am.Min.,Vol.73,p420-421,1988)

See Also:

Links to other databases for Panunzite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Ask about Panunzite here :
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Print or Cut-and-Paste your Panunzite Specimen Label here :

Panunzite

(K,Na)AlSiO4
Dana No: 76.02.01.04 Strunz No: 09.FA.05
Locality:

Notes: