Mayenite Mineral Data

General Mayenite Information

Chemical Formula:

Ca12Al14O33

Composition:

Molecular Weight = 1,386.66 gm

Calcium 34.68 % Ca 48.53 % CaO

Aluminum 27.24 % Al 51.47 % Al₂O₃

Oxygen 38.08 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₁₂Al₁₄O₃₃

Environment:

Thermally metaborphosed inclusions of marly limestone in effusive volcanic rocks. Common component of portland cement clinker.

IMA Status:

Approved IMA 1964

Locality:

Ettringer, Bellerberg, Mayen, Eifel, Rhineland-Pfalz, Germany Link to MinDat.org Location Data.

Name Origin:

Named after the locality

Name Pronunciation:

Mayenite

Synonym:

Achtarandite - pseudomorph, probably after mayenite.

ICSD 6287

PDF 9-413

Mayenite Image

Images:

Mayenite

Comments: Gray mayenite grains in matrix.
Location: Bellerberg, Eifel, Germany. Scale: Picture size 1 mm.
© Diederik Visser

Mayenite Crystallography

Cell Dimensions:

a = 11.982, Z = 2; V = 1,720.24 Den(Calc)= 2.68

Crystal System:

Isometric - Hextetrahedral H-M Symbol (4 3m) Space Group: I 43d

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

By Intensity(I/I_o): 4.89(1), 2.68(1), 2.45(0.5),3(0.5), 2.19(0.4), 1.6(0.3), 1.66(0.3), 1.95(0.3),

Physical Properties of Mayenite

Color:

Colorless.

Density:

2.85

Diaphaneity:

Transparent

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Streak:

white

Optical Properties of Mayenite

Gladstone-Dale:

CI meas= -0.082 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.151 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2399,KPDmeas= 0.2256,KC= 0.2085
Ncalc = 1.56 - 1.59

Optical Data:

Isotropic, n=1.643.

Calculated Properties of Mayenite

Electron Density:

Bulk Density (Electron Density)=2.82 gm/cc
note: Specific Gravity of Mayenite =2.85 gm/cc.

Fermion Index:

Fermion Index = 0.0006509855
Boson Index = 0.9993490145

Photoelectric:

PE_Mayenite= 5.07 barns/electron
U=PE_Mayenite x rElectron Density= 14.30 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Mayenite is Not Radioactive

Mayenite Classification

Dana Class:

07.11.03.01 (07)Multiple Oxides

(07.11)as titano-oxides with [4] and [6] substitutions

(07.11.03)Dana Group

07.11.03.01 Mayenite Ca12Al14O33 I 43d 4 3m

Strunz Class:

04.CC.20 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.C - Metal:Oxygen = 2:3, 3:5, and Similar

04.CC -With large and medium-sized cations

04.CC.20 Mayenite Ca12Al14O33 I 43d 4 3m

Other Mayenite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Mayenite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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

Mayenite

Ca12Al14O33
Dana No: 07.11.03.01 Strunz No: 04.CC.20
Locality:

Notes:

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