Mineralogy Database

Mayenite Mineral Data

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General Mayenite Information

Help on Chemical  Formula: Chemical Formula: Ca12Al14O33
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Ca12Al14O33
Help on Environment: Environment: Thermally metaborphosed inclusions of marly limestone in effusive volcanic rocks. Common component of portland cement clinker.
Help on IMA Status: IMA Status: Approved IMA 1964
Help on Locality: Locality: Ettringer, Bellerberg, Mayen, Eifel, Rhineland-Pfalz, Germany Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the locality
Help on Name Pronunciation: Name Pronunciation: Mayenite Say MAYENITE
Help on Synonym: Synonym: Achtarandite - pseudomorph, probably after mayenite.
  ICSD 6287
  PDF 9-413

Mayenite Image

Click Here for Larger   Image in a New Browser Window Images:
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Comments: Gray mayenite grains in matrix.
Location: Bellerberg, Eifel, Germany. Scale: Picture size 1 mm.
© Diederik Visser

Mayenite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 11.982, Z = 2; V = 1,720.24 Den(Calc)= 2.68
Help on Crystal System: Crystal System: Isometric - Hextetrahedral H-M Symbol (4 3m) Space Group: I 43d
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 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

Help on Color: Color: Colorless.
Help on Density: Density: 2.85
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Streak: Streak: white

Optical Properties of Mayenite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Isotropic, n=1.643.

Calculated Properties of Mayenite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.82 gm/cc
note: Specific Gravity of Mayenite =2.85 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0006509855
Boson Index = 0.9993490145
Help on Photoelectric: Photoelectric: PEMayenite = 5.07 barns/electron
U=PEMayenite x rElectron Density= 14.30 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Mayenite is Not Radioactive

Mayenite Classification

Help on  Dana Class: Dana Class: (07)Multiple Oxides
  (07.11)as titano-oxides with [4] and [6] substitutions
  (07.11.03)Dana Group Mayenite Ca12Al14O33 I 43d 4 3m
Help on  Strunz Class: 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

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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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Dana No: Strunz No: 04.CC.20





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