Montesommaite Mineral Data

Montesommaite Mineral Data +

General Montesommaite Information

Chemical Formula:

(K,Na)9Al9Si23O64·10(H2O)

Composition:

Molecular Weight = 2,433.32 gm

Potassium 13.82 % K 16.65 % K₂O

Sodium 0.19 % Na 0.25 % Na₂O

Aluminum 10.42 % Al 19.69 % Al₂O₃

Silicon 26.09 % Si 55.80 % SiO₂

Hydrogen 0.83 % H 7.40 % H₂O

Oxygen 48.66 % O

______ ______

100.00 % 99.80 % = TOTAL OXIDE

Empirical Formula:

K_8.6Na_0.2Al_9.4Si_22.6O₆₄·10(H₂O)

Environment:

In volcanic ejecta.

IMA Status:

Approved IMA 1990

Locality:

Monte Somma, Pollena, Camania, Italy. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

ICSD 40111(subcell)

IMA1988-038

PDF 46-1351

Montesommaite Image

Images:

Montesommaite

Comments: Translucent prismatic montesommaite crystals in vugs.
Location: Pollena Quarry, Vesuvius, Naples, Campania, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Montesommaite Crystallography

Axial Ratios:

a:b:c =1:1:1.7137

Cell Dimensions:

a = 10.099, b = 10.099, c = 17.307, Z = 1; V = 1,765.14 Den(Calc)= 2.29

Crystal System:

Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: F dd2

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

By Intensity(I/I_o): 3.13(1), 3.299(1), 6.589(0.75),

Crystal Structure:

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Rouse R C , Dunn P J , Grice J D , Schlenker J L , Higgins J B , American Mineralogist , 75 (1990) p.1415-1420, Montesommaite, (K,Na)9Al9Si23O64.10H2O, a new zeolite related to merlinoite and, the gismondine group

Physical Properties of Montesommaite

Cleavage:

None

Color:

Colorless.

Density:

2.34

Diaphaniety:

Transparent

Habit:

Pyramidal - Crystals are shaped like pyramids.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Montesommaite

Gladstone-Dale:

CI meas= -0.001 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.022 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2199,KPDmeas= 0.2152,KC= 0.2151

Optical Data:

Biaxial (-), a=1.498, b=1.506, g=1.507, bire=0.0090, 2V(Calc)=38, 2V(Meas)=35.

Calculated Properties of Montesommaite

Electron Density:

r_electron=2.34 gm/cc
note: r_{Montesommaite}=2.34 gm/cc.

Fermion Index

Fermion Index = 0.01243
Boson Index = 0.98757

Photoelectric:

PE_{Montesommaite}= 2.69 barns/electron
U=PE_{Montesommaite} x r_electron= 6.30 barns/cc.

Radioactivity:

GRapi = 199.31 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Montesommaite - barely detectable

Montesommaite Classification

Dana Class:

77.1.3.12 (77)Tectosilicate Zeolite group

(77.1)true zeolites

(77.1.3)Gismondine and related species

77.1.3.1 Gismondine Ca2Al4Si4O16·9(H2O) P 2₁/c 2/m

77.1.3.2 Amicite K2Na2Al4Si4O16·5(H2O) I2 2

77.1.3.3 Garronite Na2Ca5Al12Si20O64·27(H2O) I 4₁/a 4/m

77.1.3.4 Gobbinsite (Na2,Ca)2K2Al6Si10O32·12(H2O) P mn2₁ mm2

77.1.3.5 Harmotome (Ba,Na,K)1-2(Si,Al)8O16·6(H2O) P 2₁/m 2/m

77.1.3.6 Phillipsite-Na (Na,K,Ca)1-2(Si,Al)8O16·6(H2O) P 2₁/m 2/m

77.1.3.6a Phillipsite-Ca! (Ca,K,Na)1-2(Si,Al)8O16·6(H2O) P 2₁/m 2/m

77.1.3.6b Phillipsite-K! (K,Na,Ca)1-2(Si,Al)8O16·6(H2O) P 2₁/m 2/m

77.1.3.8 Perlialite K8Tl4Al12Si24O72·20(H2O) P 6/mmm 6/m 2/m 2/m

77.1.3.9 Paulingite-K (K2,Ca,Na2,Ba)5Al10Si35O90·45(H2O) Im3m 4/m 3 2/m

77.1.3.9a Paulingite-Na! (Na2,K2,Ca,Ba)5Al10Si35O90·45(H2O) Im3m 4/m 3 2/m

77.1.3.9b Paulingite-Ca! (Ca,K,Na,Ba)5[Al10Si35O84]·34(H2O) Im3m 4/m 3 2/m

77.1.3.10 Mazzite K2CaMg2(Al,Si)36O72·28(H2O) P 6₃/mmc 6/m 2/m 2/m

77.1.3.11 Merlinoite (K,Ca,Na,Ba)7Si23Al9O64·23(H2O) I mmm 2/m 2/m 2/m

77.1.3.12 Montesommaite (K,Na)9Al9Si23O64·10(H2O) F dd2 mm2

Strunz Class:

VIII/J.25-75 VIII - Silicates

VIII/J - Tectosilicates (network), with zeolite-structure, Bladed Zeolites

VIII/J.25 - Zeolite group, Amicite - Phillipsite - Yugawaralite series

VIII/J.25-10 Amicite K2Na2Al4Si4O16·5(H2O) I2 2

VIII/J.25-20 Gismondine Ca2Al4Si4O16·9(H2O) P 2₁/c 2/m

VIII/J.25-30 Gobbinsite (Na2,Ca)2K2Al6Si10O32·12(H2O) P mn2₁ mm2

VIII/J.25-40 Garronite Na2Ca5Al12Si20O64·27(H2O) I 4₁/a 4/m

VIII/J.25-50 Phillipsite-Na (Na,K,Ca)1-2(Si,Al)8O16·6(H2O) P 2₁/m 2/m

VIII/J.25-55 Phillipsite-K! (K,Na,Ca)1-2(Si,Al)8O16·6(H2O) P 2₁/m 2/m

VIII/J.25-60 Phillipsite-Ca! (Ca,K,Na)1-2(Si,Al)8O16·6(H2O) P 2₁/m 2/m

VIII/J.25-70 Harmotome (Ba,Na,K)1-2(Si,Al)8O16·6(H2O) P 2₁/m 2/m

VIII/J.25-75 Montesommaite (K,Na)9Al9Si23O64·10(H2O) F dd2 mm2

VIII/J.25-80 Merlinoite (K,Ca,Na,Ba)7Si23Al9O64·23(H2O) I mmm 2/m 2/m 2/m

VIII/J.25-90 Yugawaralite CaAl2Si6O16·4(H2O) Pc m

Other Montesommaite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Am.Min.,Vol.75,p1415-1420,1990) OPTIC PROP.(Am.Min.,Vol.75,p1415-1420,1990)

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Montesommaite

(K,Na)9Al9Si23O64·10(H2O)
Dana No: 77.1.3.12 Strunz No: VIII/J.25-75
Locality:

Notes: