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Alleghanyite Mineral Data + |
General Alleghanyite Information |
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| Mn5(SiO4)2(OH)2 | |||
| Molecular Weight = 492.87 gm | |||
| Manganese 55.73 % Mn 71.96 % MnO | |||
| Silicon 11.40 % Si 24.38 % SiO2 | |||
| Hydrogen 0.41 % H 3.66 % H2O | |||
| Oxygen 32.46 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Mn2+5(SiO4)2(OH)2 | |||
| Manganese vein deposits. | |||
| Valid Species (Pre-IMA) 1932 | |||
| Bald Knob, Alleghany Co., North Carolina, USA. Link to MinDat.org Location Data. | |||
| Named after its locality. | |||
| ICSD 14253 | |||
| PDF 43-683 | |||
Alleghanyite Image | |||
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Alleghanyite Crystallography |
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| a:b:c =2.1522:1:1.7078 | |||
| a = 10.46, b = 4.86, c = 8.3, Z = 2; beta = 109.133° V = 398.63 Den(Calc)= 4.11 | |||
| Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/a | |||
| By Intensity(I/Io): 1.799(1), 2.86(0.8), 2.598(0.6), | |||
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Physical Properties of Alleghanyite |
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| None | |||
| White, Brown, Bright pink, Grayish pink. | |||
| 4 | |||
| Transparent to Subtransparent to translucent | |||
| Brittle - Generally displayed by glasses and most non-metallic minerals. | |||
| Granular - Generally occurs as anhedral to subhedral crystals in matrix. | |||
| Massive - Lamellar - Distinctly foliated fine-grained forms. | |||
| 6-5 | |||
| Non-fluorescent. | |||
| Vitreous (Glassy) | |||
Optical Properties of Alleghanyite |
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| CI meas= 0.053 (Good) - where the CI = (1-KPDmeas/KC) CI calc= 0.079 (Fair) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.1888,KPDmeas= 0.194,KC= 0.2049 |
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| Biaxial (-), a=1.756, b=1.78, g=1.792, bire=0.0360, 2V(Calc)=68, 2V(Meas)=72. Dispersion r > v. | |||
Calculated Properties of Alleghanyite |
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relectron=3.81 gm/cc |
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| Fermion Index = 0.00547 Boson Index = 0.99453 |
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PEAlleghanyite = 14.88 barns/electron |
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| GRapi = 0 (Gamma Ray American Petroleum Institute Units) Alleghanyite is Not Radioactive |
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Alleghanyite Classification |
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| 52.3.2b.1 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O | |||
| (52.3)with cations in [6] coordination only | |||
| (52.3.2b)Humite group (Chondrodite series) | |||
| VIII/B.04-60 VIII - Silicates | |||
| VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, cations of octahedral and tetrahedral orientation [4/6] | |||
| VIII/B.04 - Humite group | |||
Other Alleghanyite Information |
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| NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) | |||
| Links to other databases for Alleghanyite : 1 - Am. Min. Crystal Structure Database 2 - Athena 3 - EUROmin Project 4 - Ecole des Mines de Paris 5 - Franklin Minerals(Dunn) 6 - Google Images 7 - Google Scholar 8 - Handbook of Mineralogy (MinSocAm) 9 - Handbook of Mineralogy (UofA) 10 - MinDAT 11 - MinMax(Deutsch) 12 - MinMax(English) 13 - Mineralienatlas (Deutsch) 14 - QUT Mineral Atlas 15 - Ruff.Info 16 - WWW-MINCRYST Search for Alleghanyite using: Visit our Advertisers for Alleghanyite : AA Mineral SpecimensB & L Fine Minerals Dan Weinrich Fine Minerals Dan Weinrich Auctions Excalibur Minerals Exceptional Minerals Fabre Minerals Greenside Minerals Heliodor John Betts Fine Minerals Mason's Minerals Mineral News Mineral of the Month Club MineralsWeb Fine Minerals The GeoZone Wrights Rock Shop Translate Alleghanyite Mineral Data : Ask about Alleghanyite here : Print or Cut-and-Paste your Alleghanyite Specimen Label here :
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