Gismondine Mineral Data

Gismondine Mineral Data +

General Gismondine Information

Chemical Formula:

Ca2Al4Si4O16·9(H2O)

Composition:

Molecular Weight = 718.55 gm

Calcium 11.16 % Ca 15.61 % CaO

Aluminum 15.02 % Al 28.38 % Al₂O₃

Silicon 15.63 % Si 33.45 % SiO₂

Hydrogen 2.52 % H 22.56 % H₂O

Oxygen 55.67 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₂Al₄Si₄O₁₆·9(H₂O)

Environment:

Alteration product of plagioclase.

IMA Status:

Valid Species (Pre-IMA) 1817

Locality:

Capo di Bove, near Rome, Italy. Link to MinDat.org Location Data.

Name Origin:

Named after the Italian mineralogist, Carlo Giuseppe Gismondi (1762-1824), lecturer in Mineralogy in Rome.

Synonym:

Abrazite

Aricite

Gismondite

ICSD 61439

PDF 39-1373

Zeagonite

Gismondine Image

Images:

Gismondine

Comments: Clear crystal of gismondine on matrix.
Location: Alban Hills, near Rome, Latium, Italy. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Gismondine Crystallography

Axial Ratios:

a:b:c =0.9441:1:0.9271

Cell Dimensions:

a = 10.023, b = 10.616, c = 9.843, Z = 2; beta = 92.42° V = 1,046.40 Den(Calc)= 2.28

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

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

By Intensity(I/I_o): 2.71(1), 3.19(0.7), 4.25(0.7),

Crystal Structure:

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Fischer K F , American Mineralogist , 48 (1963) p.664-672, The crystal structure determination of the zeolite gismondite. CaAl2Si2O8.4H2O

Physical Properties of Gismondine

Cleavage:

[101] Imperfect

Color:

Blue white, Colorless, Gray, White, Red.

Density:

2.26

Diaphaniety:

Transparent to translucent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Globular - Spherical, or nearly so, rounded forms (e.g. wavellite).

Habit:

Pseudo Tetragonal - Crystals show a tetragonal shape.

Hardness:

4-5 - Fluorite-Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Gismondine

Gladstone-Dale:

CI meas= -0.003 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.006 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2364,KPDmeas= 0.2385,KC= 0.2378

Optical Data:

Biaxial (-), a=1.536, b=1.539, g=1.542, bire=0.0060, 2V(Calc)=88, 2V(Meas)=84.

Calculated Properties of Gismondine

Electron Density:

r_electron=2.30 gm/cc
note: r_Gismondine=2.26 gm/cc.

Fermion Index

Fermion Index = 0.00772
Boson Index = 0.99228

Photoelectric:

PE_Gismondine= 2.44 barns/electron
U=PE_Gismondine x r_electron= 5.61 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Gismondine is Not Radioactive

Gismondine Classification

Dana Class:

77.1.3.1 (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.25-20 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 Gismondine Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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Gismondine

Ca2Al4Si4O16·9(H2O)
Dana No: 77.1.3.1 Strunz No: VIII/J.25-20
Locality:

Notes: