Mineralogy Database

Macaulayite Mineral Data

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General Macaulayite Information

Help on Chemical  Formula: Chemical Formula: (Fe+++,Al)24Si4O43(OH)2
Help on Composition: Composition: Molecular Weight = 2,116.93 gm
   Aluminum   2.55 %  Al    4.82 % Al2O3
   Iron      58.04 %  Fe   82.98 % Fe2O3
   Silicon    5.31 %  Si   11.35 % SiO2
   Hydrogen   0.10 %  H     0.85 % H2O
   Oxygen    34.01 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe3+22Al2Si4O43(OH)2
Help on Environment: Environment: Deeply weathered granite.
Help on IMA Status: IMA Status: Approved IMA 1984
Help on Locality: Locality: Bennachie car park, 7 km NW of Inverurie, Aberdeenshire, Scotland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the Macaulay Institute for Soil Research.
Help on Name Pronunciation: Name Pronunciation: Macaulayite + Pronunciation Say MACAULAYITE

Macaulayite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.5773:1:4.1647
Help on Cell Dimensions: Cell Dimensions: a = 5.038, b = 8.726, c = 36.342, Z = 2; beta = 92° V = 1,596.68 Den(Calc)= 4.40
Help on Crystal System: Crystal System: Monoclinic Space Group: C?
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.533(1), 1.462(0.35), 2.72(0.35),

Physical Properties of Macaulayite

Help on Cleavage: Cleavage: {001} Good
Help on Color: Color: Blood red.
Help on Density: Density: 4.41
Help on Habit: Habit: Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).
Help on Luster: Luster: Earthy (Dull)
Help on Streak: Streak: light red

Optical Properties of Macaulayite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.441 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.44 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1668,KPDmeas= 0.1664,KC= 0.2979
Ncalc = 2.31
Help on Optical Data: Optical Data: Biaxial (?), a=1.734
Help on Pleochroism (x): Pleochroism (x): pale red.
Help on Pleochroism (z): Pleochroism (z): yellow.

Calculated Properties of Macaulayite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.22 gm/cc
note: Specific Gravity of Macaulayite =4.40 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEMacaulayite = 17.88 barns/electron
U=PEMacaulayite x rElectron Density= 75.51 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Macaulayite is Not Radioactive

Macaulayite Classification

Help on  Dana Class: Dana Class: (71)Phyllosilicate Sheets of Six-Membered Rings
  (71.02)with 2:1 Layers
  (71.02.05)Dana Group Macaulayite (Fe,Al)24Si4O43(OH)2 C? Mono
Help on  Strunz Class: Strunz Class: 09.EC.65 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EC -Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets
09.EC.65 Macaulayite (Fe,Al)24Si4O43(OH)2 C? Mono

Other Macaulayite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Macaulayite :
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: 09.EC.65





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