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Panunzite

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Formula:
(K,Na)AlSiO4
System:
Hexagonal
Colour:
colourless
Lustre:
Vitreous
Hardness:
Name:
Named by Enrico Franco and Maurizio De Gennaro in 1988 in honor of Achille Panunzi, professor of chemistry, University of Naples. Dr. Panunzi discovered the blocks ejected from Mt. Somma that contained the mineral.
This page provides mineralogical data about Panunzite.


Classification of Panunzite

Approved
Approval Year:
1978
9.FA.05

9 : SILICATES (Germanates)
F : Tektosilicates without zeolitic H2O
A : Tektosilicates without additional non-tetrahedral anions
76.2.1.4

76 : TECTOSILICATES Al-Si Framework
2 : Al-Si Framework Feldspathoids and related species
16.4.2

16 : Silicates Containing Aluminum and other Metals
4 : Aluminosilicates of Na and K

Physical Properties of Panunzite

Vitreous
Diaphaneity (Transparency):
Transparent
Colour:
colourless
Streak:
white
Hardness (Mohs):
Density:
2.59 g/cm3 (Measured)    2.62 g/cm3 (Calculated)

Optical Data of Panunzite

Type:
Uniaxial (-)
RI values:
nω = 1.540() nε = 1.535(1)
Birefringence:
0.005
Max Birefringence:
δ = 0.005
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Low
Pleochroism:
Not Visible

Chemical Properties of Panunzite

Formula:
(K,Na)AlSiO4
IMA Formula:
K3Na(AlSiO4)4
Elements listed in formula:
Analytical Data:
KAlSiO4 with some substitution of Na for K. Analysis from Franco and de Gennaro (1988), quoted in Handbook of Mineralogy.
SiO2 (39.60)
Al2O3 (31.90)
Fe2O3 (0.35)
FeO (0.15)
MgO (0.11)
CaO (0.43)
SrO (0.01)
BaO (0.12)
Na2O (5.74)
K2O (21.52)
Rb2O (0.07)
H2O (0.12)
TOTAL (100.12)
Common Impurities:
Fe,Mg,Ca,Sr,Ba,Rb,H2O

Crystallography of Panunzite

Crystal System:
Hexagonal
Class (H-M):
6 - Pyramidal
Space Group:
P63
Cell Parameters:
a = 20.513(8) Å, c = 8.553(3) Å
Ratio:
a:b:c = 0 : 0
Unit Cell Volume:
V 3,116.79 ų (Calculated from Unit Cell)
Z:
32
X-Ray Powder Diffraction Data:
d-spacingIntensity
4.277 (25)
3.929 (70)
3.071 (100)
2.914 (30)
2.558 (40)
2.380 (20)
2.268 (20)

Type Occurrence of Panunzite

General Appearance of Type Material:
hexagonal prisms up to 4 mm in length.
Geological Setting of Type Material:
in cavities in pyroxene-rich ejecta blocks in recent volcanoclastic deposits.

Relationship of Panunzite to other Species

9.FA.05KaliophiliteKAlSiO4
9.FA.05KalsiliteKAlSiO4
9.FA.05Nepheline(Na,K)AlSiO4
9.FA.05Trikalsilite(K,Na)AlSiO4
9.FA.05Yoshiokaite(Ca,Na)[Al(Al,Si)O4]
9.FA.05MegakalsiliteKAlSiO4
9.FA.10MalinkoiteNaBSiO4
9.FA.15VirgiliteLiAlSi2O6
9.FA.25LisitsyniteKBSi2O6
9.FA.30AdulariaKAlSi3O8
9.FA.30Anorthoclase(Na,K)AlSi3O8
9.FA.30Buddingtonite(NH4)(AlSi3)O8
9.FA.30CelsianBa(Al2Si2O8)
9.FA.30Hyalophane(K,Ba)[Al(Si,Al)Si2O8]
9.FA.30MicroclineK(AlSi3O8)
9.FA.30OrthoclaseK(AlSi3O8)
9.FA.30SanidineK(AlSi3O8)
9.FA.30RubiclineRb(AlSi3O8)
9.FA.30MonalbiteNaAlSi3O8
9.FA.35AlbiteNa(AlSi3O8)
9.FA.35Andesine(Na,Ca)[Al(Si,Al)Si2O8]
9.FA.35AnorthiteCa(Al2Si2O8)
9.FA.35Bytownite(Ca,Na)[Al(Al,Si)Si2O8]
9.FA.35Labradorite(Ca,Na)[Al(Al,Si)Si2O8]
9.FA.35Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]
9.FA.35ReedmergneriteNaBSi3O8
9.FA.40ParacelsianBa(Al2Si2O8)
9.FA.45SvyatoslaviteCa(Al2Si2O8)
9.FA.45KumdykoliteNa(AlSi3O8)
9.FA.50SlawsoniteSr(Al2Si2O8)
9.FA.55LisetiteCaNa2Al4Si4O16
9.FA.60BanalsiteNa2BaAl4Si4O16
9.FA.60StronalsiteNa2SrAl4Si4O16
9.FA.65DanburiteCaB2Si2O8
9.FA.65MaleeviteBaB2Si2O8
9.FA.65PekoviteSrB2Si2O8
9.FA.70Lingunite(Na,Ca)AlSi3O8
9.FA.75KokchetaviteK(AlSi3O8)
16.4.1Nepheline(Na,K)AlSiO4
16.4.3Trikalsilite(K,Na)AlSiO4
16.4.4Anorthoclase(Na,K)AlSi3O8
16.4.5Naujakasite(Na,K)6(Fe2+,Mn2+,Ca)(Al,Fe)4Si8O26
16.4.6Montesommaite(K,Na)9Al9Si23O64 · 10H2O

Other Names for Panunzite

Name in Other Languages:
German:Panunzit
Spanish:Panunzita

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Panunzite

Reference List:
Sahama, Th.G., Smith, J.V. (1957) Tri-kalsilite, a new mineral. American Mineralogist: 42: 286.

Fleischer, M., Mandarino, J.A., Chao, G.Y. (1979) New mineral names. American Mineralogist: 64: 652-659.

Merlino, S., Franco, E., Mattia, C.A., Pasero, M., De Gennaro, M. (1985) The crystal structure of panunzite (natural tetrakalsilite). Neues Jahrbuch für Mineralogie, Monatshefte: 7: 322-328.

Franco, E., De Gennaro, M. (1988) Panunzite, a new mineral from Mt. Somma-Vesuvio, Italy. American Mineralogist: 73: 420-421.

Internet Links for Panunzite

mindat.org URL:
https://www.mindat.org/min-3075.html
Please feel free to link to this page.

Localities for Panunzite

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Italy (TL)
 
  • Campania
    • Naples Province
      • Somma-Vesuvius Complex
Franco, E., De Gennaro, M. (1988) Panunzite, a new mineral from Mt. Somma-Vesuvio, Italy. American Mineralogist: 73: 420-421.; Lapis 1994:5 p.13-23,58]
  • Umbria
    • Terni Province
      • San Venanzo
Ciriotti, M.E., Fascio, L., Pasero, M. (2004): Italian Type Minerals. Felici, Ed. Pisa, CD-ROM
Mineral and/or Locality  
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