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Macaulayite Mineral Data + |
General Macaulayite Information |
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| (Fe+++,Al)24Si4O43(OH)2 | |||
| 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 | |||
| Fe3+22Al2Si4O43(OH)2 | |||
| Deeply weathered granite. | |||
| Approved IMA 1984 | |||
| Bennachie car park, 7 km NW of Inverurie, Aberdeenshire, Scotland. Link to MinDat.org Location Data. | |||
| Named for the Macaulay Institute for Soil Research. | |||
Search for Macaulayite Images | |||
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Macaulayite Crystallography |
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| a:b:c =0.5773:1:4.1647 | |||
| a = 5.038, b = 8.726, c = 36.342, Z = 2; beta = 92° V = 1,596.68 Den(Calc)= 4.40 | |||
| MonoclinicSpace Group: C? | |||
| By Intensity(I/Io): 2.533(1), 1.462(0.35), 2.72(0.35), | |||
Physical Properties of Macaulayite |
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| [001] Good | |||
| Blood red. | |||
| 4.41 | |||
| Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite). | |||
| Earthy (Dull) | |||
| light red | |||
Optical Properties of Macaulayite |
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| 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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| Biaxial (?), a=1.734 | |||
| pale red. | |||
| yellow. | |||
Calculated Properties of Macaulayite |
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relectron=4.22 gm/cc |
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| Fermion Index = 0.01494 Boson Index = 0.98506 |
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PEMacaulayite = 17.88 barns/electron |
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| GRapi = 0 (Gamma Ray American Petroleum Institute Units) Macaulayite is Not Radioactive |
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Macaulayite Classification |
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| 71.2.5.1 (71)Phyllosilicate Sheets of Six-Membered Rings | |||
| (71.2)with 2:1 Layers | |||
| (71.2.5)Dana Group | |||
| 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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| NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8) | |||
| 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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