Macaulayite Mineral Data + 
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- 71.2.5.1 Macaulayite (Fe,Al)24Si4O43(OH)2 C? Mono
- VIII/H.09-10 Pyrophyllite Al2Si4O10(OH)2 P1 1
- VIII/H.09-20 Ferripyrophyllite Fe2Si4O10(OH)2 C 2/m 2/m
- VIII/H.09-30 Macaulayite (Fe,Al)24Si4O43(OH)2 C? Mono
- VIII/H.09-40 Talc Mg3Si4O10(OH)2 C 2/c 2/m
- VIII/H.09-50 Minnesotaite (Fe,Mg)3Si4O10(OH)2 C1 1
- VIII/H.09-60 Willemseite (Ni,Mg)3Si4O10(OH)2 C 2/c 2/m
- VIII/H.09-65 Pimelite Ni3Si4O10(OH)2·4(H2O) Unk. Hex
- VIII/H.09-70 Kegelite Pb8Al4Si8O20(SO4)2(CO3)4(OH)8 A2/m,A2,Am Mono
General Macaulayite Information |
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 Chemical Formula: |
(Fe+++,Al)24Si4O43(OH)2 | ||
| 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 | |||
| Empirical Formula: |
Fe3+22Al2Si4O43(OH)2 | ||
| Environment: |
Deeply weathered granite. | ||
| IMA Status: |
Approved IMA 1984 | ||
| Locality: |
Bennachie car park, 7 km NW of Inverurie, Aberdeenshire, Scotland. Link to MinDat.org Location Data. | ||
| Name Origin: |
Named for the Macaulay Institute for Soil Research. | ||
Search for Macaulayite Images | |||
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Images:
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Macaulayite Crystallography |
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| Axial Ratios: |
a:b:c =0.5773:1:4.1647 | ||
| Cell Dimensions: |
a = 5.038, b = 8.726, c = 36.342, Z = 2; beta = 92° V = 1,596.68 Den(Calc)= 4.40 | ||
| Crystal System: |
MonoclinicSpace Group: C? | ||
| X Ray Diffraction: |
By Intensity(I/Io): 2.533(1), 1.462(0.35), 2.72(0.35), | ||
Physical Properties of Macaulayite |
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| Cleavage: |
[001] Good | ||
| Color: |
Blood red. | ||
| Density: |
4.41 | ||
| Habit: |
Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite). | ||
| Luster: |
Earthy (Dull) | ||
| Streak: |
light red | ||
Optical Properties of Macaulayite |
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| 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 |
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| Optical Data: |
Biaxial (?), a=1.734 | ||
| Pleochroism (x): |
pale red. | ||
| Pleochroism (z): |
yellow. | ||
Calculated Properties of Macaulayite |
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| Electron Density: |
relectron=4.22 gm/cc |
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| Fermion Index |
Fermion Index = 0.01494 Boson Index = 0.98506 |
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| Photoelectric: |
PEMacaulayite = 17.88 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Macaulayite is Not Radioactive |
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Macaulayite Classification |
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| Dana Class: |
71.2.5.1 (71)Phyllosilicate Sheets of Six-Membered Rings | ||
| (71.2)with 2:1 Layers | |||
| (71.2.5)Dana Group | |||
| Strunz Class: |
VIII/H.09-30 VIII - Silicates | ||
| VIII/H - Phyllosilicates (layered) Mica like layered silicates with [Si4O10]4- and related groups | |||
| VIII/H.09 - Talc series | |||
Other Macaulayite Information |
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| References: |
NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8) | ||
| See Also: |
Links to other databases for Macaulayite : 1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris Search for Macaulayite using: Visit our Advertisers for Macaulayite : Translate Macaulayite Mineral Data : Ask about Macaulayite here : Print or Cut-and-Paste your Macaulayite Specimen Label here :
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