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Panunzite

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Monte Somma, Somma-Vesuvius Complex, Naples Province, Campania, Italy
© OT. Ljostad

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Formula:
(K,Na)AlSiO
 
4
System:HexagonalColour:colourless
Hardness:5½
This page provides mineralogical data about Panunzite.

Classification of Panunzite

IMA status:Approved 1978
Strunz 8th edition ID:8/J.02-40
Nickel-Strunz 10th (pending) edition ID:9.FA.05

9 : SILICATES (Germanates)
F : Tektosilicates without zeolitic H2O
A : Tektosilicates without additional non-tetrahedral anions
Dana 8th edition ID:76.2.1.4

76 : TECTOSILICATES Al-Si Framework
2 : Al-Si Framework Feldspathoids and related species
Hey's CIM Ref.:16.4.2

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

Type Locality:Monte Somma, Somma-Vesuvius Complex, Naples Province, Campania, Italy
General Appearance of Type Material:hexagonal prisms up to 4 mm in length.
Year of Discovery:1978
Geological Setting of type material:in cavities in pyroxene-rich ejecta blocks in recent volcanoclastic deposits.

Physical Properties of Panunzite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:colourless
Streak:white
Hardness (Mohs):5½
Density (measured):2.59 g/cm3
Density (calculated):2.62 g/cm3

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:c = 1 : 0.417
Unit Cell Volume:V 3,116.79 ų (Calculated from Unit Cell)
Z:32
X-Ray Powder Diffraction:
d-spacingIntensity
4.277 (25)
3.929 (70)
3.071 (100)
2.914 (30)
2.558 (40)
2.380 (20)
2.268 (20)

Optical Data of Panunzite

Type:Uniaxial (-)
RI values: nω = 1.540() nε = 1.535(1)
Birefringence:0.005
Maximum Birefringence:δ = 0.005

Chart 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)AlSiO
 
4
Essential elements:Al, K, O, Si
All elements listed in formula:Al, K, Na, O, Si
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

Relationship of Panunzite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.FA.05Kaliophilite
KAlSiO
 
4
9.FA.05Kalsilite
KAlSiO
 
4
9.FA.05Nepheline
(Na,K)AlSiO
 
4
9.FA.05Trikalsilite
(K,Na)AlSiO
 
4
9.FA.05Yoshiokaite
(Ca,Na)[Al(Al,Si)O
 
4
]
9.FA.05Megakalsilite
KAlSiO
 
4
9.FA.10Malinkoite
NaBSiO
 
4
9.FA.15Virgilite
LiAlSi
 
2
O
 
6
9.FA.25Lisitsynite
KBSi
 
2
O
 
6
9.FA.30Adularia
KAlSi
 
3
O
 
8
9.FA.30Anorthoclase
(Na,K)AlSi
 
3
O
 
8
9.FA.30Buddingtonite
(NH
 
4
)AlSi
 
3
O
 
8
9.FA.30Celsian
BaAl
 
2
Si
 
2
O
 
8
9.FA.30Hyalophane
(K,Ba)[Al(Si,Al)Si
 
2
O
 
8
]
9.FA.30Microcline
KAlSi
 
3
O
 
8
9.FA.30Orthoclase
KAlSi
 
3
O
 
8
9.FA.30Sanidine
KAlSi
 
3
O
 
8
9.FA.30Rubicline
(Rb,K)AlSi
 
3
O
 
8
9.FA.30Monalbite
NaAlSi
 
3
O
 
8
9.FA.35Albite
NaAlSi
 
3
O
 
8
9.FA.35Andesine
(Na,Ca)[Al(Si,Al)Si
 
2
O
 
8
]
9.FA.35Anorthite
CaAl
 
2
Si
 
2
O
 
8
9.FA.35Bytownite
(Ca,Na)[Al(Al,Si)Si
 
2
O
 
8
]
9.FA.35Labradorite
(Ca,Na)[Al(Al,Si)Si
 
2
O
 
8
]
9.FA.35Oligoclase
(Na,Ca)[Al(Si,Al)Si
 
2
O
 
8
]
9.FA.35Reedmergnerite
Na[BSi
 
3
O
 
8
]
9.FA.40Paracelsian
BaAl
 
2
Si
 
2
O
 
8
9.FA.45Svyatoslavite
CaAl
 
2
Si
 
2
O
 
8
9.FA.45Kumdykolite
NaAlSi
 
3
O
 
8
9.FA.50Slawsonite
(Sr,Ca)Al
 
2
Si
 
2
O
 
8
9.FA.55Lisetite
CaNa
 
2
Al
 
4
Si
 
4
O
 
16
9.FA.60Banalsite
BaNa
 
2
[Al
 
2
Si
 
2
O
 
8
]
 
2
9.FA.60Stronalsite
SrNa
 
2
[Al
 
2
Si
 
2
O
 
8
]
 
2
9.FA.65Danburite
CaB
 
2
Si
 
2
O
 
8
9.FA.65Maleevite
BaB
 
2
Si
 
2
O
 
8
9.FA.65Pekovite
SrB
 
2
Si
 
2
O
 
8
9.FA.70Lingunite
(Na,Ca)AlSi
 
3
O
 
8
9.FA.75Kokchetavite
KAlSi
 
3
O
 
8
Related Minerals - Hey's Index Grouping:

- +
16.4.1Nepheline
(Na,K)AlSiO
 
4
16.4.3Trikalsilite
(K,Na)AlSiO
 
4
16.4.4Anorthoclase
(Na,K)AlSi
 
3
O
 
8
16.4.5Naujakasite
(Na,K)
 
6
(Fe
2+
 
,Mn
2+
 
,Ca)(Al,Fe)
 
4
Si
 
8
O
 
26
16.4.6Montesommaite
(K,Na)
 
9
Al
 
9
Si
 
23
O
 
64
 · 10H
 
2
O

Other Names for Panunzite

Synonyms:
IMA1978-050Tetrakalsilite
Other Languages:
German:Panunzit
Russian:Панунцит
Spanish:Panunzita

Other Information

Health Warning: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:

- +
American Mineralogist (1957): 42: 286.

American Mineralogist (1979): 64: 658.

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

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  • Panunzite details from Handbook of Mineralogy (PDF)
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    • Localities for Panunzite

    The 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.
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    (TL) indicates type locality. ? 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
     
    • Campania
      • Naples Province
        • Somma-Vesuvius Complex
    		[Amer.Min.(1988) 73, 420-421; Lapis 1994:5 p.13-23,58]
    • Umbria
      • Terni Province
        • Marsciano
          • San Venanzo
    		Ciriotti, M.E., Fascio, L., Pasero, M. (2004): Italian Type Minerals. Felici, Ed. Pisa, CD-ROM
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