Panunzite Mineral Data

Panunzite Mineral Data +

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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

IMA Status:

Approved IMA 1988

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 30951

PDF 31-1081

Panunzite Image

Images:

Panunzite

Comments: Opaque white fibrous panunzite coatings.
Location: Pilcante, Trentino, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Panunzite

Electron Density:

r_electron=2.59 gm/cc
note: r_Panunzite=2.63 gm/cc.

Fermion Index

Fermion Index = 0.00873
Boson Index = 0.99127

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)

Estimated Radioactivity from Panunzite - barely detectable

Panunzite Classification

Dana Class:

76.2.1.4 (76)Tectosilicate Al-Si Framework

(76.2)Feldspathoids and related species

(76.2.1)Nepheline group

76.2.1.1 Kalsilite KAlSiO4 P 3₁c 3m

76.2.1.2 Nepheline (Na,K)AlSiO4 P 6₃ 6

76.2.1.3 Trikalsilite (K,Na)AlSiO4 P 6₃ 6

76.2.1.4 Panunzite (K,Na)AlSiO4 P 6₃ 6

76.2.1.5 Kaliophilite KAlSiO4 P 6₃22 6 2 2

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

76.2.1.7 Megakalsilite! KAlSiO4 P 6₃ 6

Strunz Class:

VIII/J.02-40 VIII - Silicates

VIII/J - Tectosilicates (network) without anions unfamiliar to the tetraheders

VIII/J.02 - Nepheline - Yoshiokaite series

VIII/J.02-10 Nepheline (Na,K)AlSiO4 P 6₃ 6

VIII/J.02-20 Kalsilite KAlSiO4 P 3₁c 3m

VIII/J.02-25 Megakalsilite! KAlSiO4 P 6₃ 6

VIII/J.02-30 Trikalsilite (K,Na)AlSiO4 P 6₃ 6

VIII/J.02-40 Panunzite (K,Na)AlSiO4 P 6₃ 6

VIII/J.02-50 Kaliophilite KAlSiO4 P 6₃22 6 2 2

VIII/J.02-60 Yoshiokaite (Ca8-(x/2)[](x/2)Al16-xSixO32) P 3 3

VIII/J.02-70 Malinkoite! NaBSiO4 P 6₃ 6

Other Panunzite Information

References:

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

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

Panunzite

(K,Na)AlSiO4
Dana No: 76.2.1.4 Strunz No: VIII/J.02-40
Locality:

Notes: