Mazzite-Mg Mineral Data

General Mazzite-Mg Information

Chemical Formula:

K2CaMg2(Al,Si)36O72•28(H2O)

Composition:

Molecular Weight = 2,808.04 gm

Potassium 2.65 % K 3.19 % K₂O

Calcium 2.00 % Ca 2.80 % CaO

Magnesium 1.73 % Mg 2.87 % MgO

Aluminum 9.42 % Al 17.79 % Al₂O₃

Silicon 26.50 % Si 56.70 % SiO₂

Hydrogen 1.87 % H 16.68 % H₂O

Oxygen 55.84 % O

______ ______

100.00 % 100.03 % = TOTAL OXIDE

Empirical Formula:

K_1.9Ca_1.4Mg₂Si_26.5Al_9.8O₇₂•26(H₂O)

Environment:

In cavities in a porphyritic olivine basalt. Renamed from mazzite to massite-Mg with the publication of mazzite-Na.

IMA Status:

Approved IMA 1974

Locality:

On Mont Semiol (Mont Semiouse), near Montbrison, Loire, France. Link to MinDat.org Location Data.

Name Origin:

Named for Prof. Fiorenzo Mazzi, mineralogist, University of Pavia, Pavia, Italy.

Name Pronunciation:

Mazzite-Mg

Mazzite-Mg Image

Images:

Mazzite-Mg

Comments: Clear colorless microcrystals and crystalline mazzite in vug.
Location: Mont Simiol, Loire, France. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Mazzite-Mg Crystallography

Axial Ratios:

a:c = 1:0.41572

Cell Dimensions:

a = 18.392, c = 7.646, Z = 1; V = 2,239.87 Den(Calc)= 2.08

Crystal System:

Hexagonal - Dihexagonal Dipyramidal H-M Symbol (6/m 2/m 2/m) Space Group: P 6₃/mmc

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

By Intensity(I/I_o): 2.941(1), 3.185(1), 3.824(0.94),

Physical Properties of Mazzite-Mg

Color:

Colorless, White.

Density:

2.108

Diaphaneity:

Transparent to Translucent

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

4-5 - Fluorite-Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Mazzite-Mg

Gladstone-Dale:

CI meas= -0.04 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.054 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2416,KPDmeas= 0.2384,KC= 0.2293
Ncalc = 1.48

Optical Data:

Uniaxial (-), e=1.499, w=1.5062, bire=0.0072.

Calculated Properties of Mazzite-Mg

Electron Density:

Bulk Density (Electron Density)=2.14 gm/cc
note: Specific Gravity of Mazzite-Mg =2.11 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Mazzite-Mg= 1.87 barns/electron
U=PE_Mazzite-Mg x r_electron= 4.00 barns/cc.

Radioactivity:

GRapi = 38.69 (Gamma Ray American Petroleum Institute Units)
Concentration of Mazzite-Mg per GRapi unit = 2.58 (%)

Estimated Radioactivity from Mazzite-Mg - barely detectable

Mazzite-Mg Classification

Dana Class:

77.01.03.10 (77)Tectosilicate Zeolite group

(77.01)true zeolites

(77.01.03)Gismondine and related species

77.01.03.01 Gismondine Ca2Al4Si4O16•9(H2O) P 2₁/c 2/m

77.01.03.02 Amicite K2Na2Al4Si4O16•5(H2O) I2 2

77.01.03.03 Garronite Na2Ca5Al12Si20O64•27(H2O) I 4₁/a 4/m

77.01.03.04 Gobbinsite (Na2,Ca)2K2Al6Si10O32•12(H2O) P mn2₁ mm2

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

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

77.01.03.06a Phillipsite-Ca! (Ca,K,Na)1-2(Si,Al)8O16•6(H2O) P 2₁/m 2/m

77.01.03.06b Phillipsite-K! (K,Na,Ca)1-2(Si,Al)8O16•6(H2O) P 2₁/m 2/m

77.01.03.08 Perlialite K8Tl4Al12Si24O72•20(H2O) P 6/mmm 6/m 2/m 2/m

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

77.01.03.09a Paulingite-Na! (Na2,K2,Ca,Ba)5Al10Si35O90•45(H2O) Im3m 4/m 3 2/m

77.01.03.09b Paulingite-Ca! (Ca,K,Na,Ba)5[Al10Si35O84]•34(H2O) Im3m 4/m 3 2/m

77.01.03.10 Mazzite-Mg K2CaMg2(Al,Si)36O72•28(H2O) P 6₃/mmc 6/m 2/m 2/m

77.01.03.10a Mazzite-Na! Na8Al8Si28O72•30H2O P 6₃/mmc 6/m 2/m 2/m

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

77.01.03.12 Montesommaite (K,Na)9Al9Si23O64•10(H2O) F dd2 mm2

Strunz Class:

09.GC.20 09 - SILICATES (Germanates)

09.G - Tektosilicates with Zeolitic H2O

09.GC -Chains of doubly-connected 4-membered rings

09.GC.20 Mazzite-Mg K2CaMg2(Al,Si)36O72•28(H2O) P 6₃/mmc 6/m 2/m 2/m

09.GC.20 Mazzite-Na! Na8Al8Si28O72•30H2O P 6₃/mmc 6/m 2/m 2/m

Other Mazzite-Mg Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Mazzite-Mg :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Mazzite-Mg

K2CaMg2(Al,Si)36O72•28(H2O)
Dana No: 77.01.03.10 Strunz No: 09.GC.20
Locality:

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