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Neptunite Mineral Data + |
General Neptunite Information |
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| KNa2Li(Fe++,Mn)2Ti2Si8O24 | |||
| Molecular Weight = 907.69 gm | |||
| Potassium 4.31 % K 5.19 % K2O | |||
| Sodium 5.07 % Na 6.83 % Na2O | |||
| Lithium 0.76 % Li 1.65 % Li2O | |||
| Titanium 10.55 % Ti 17.60 % TiO2 | |||
| Manganese 3.03 % Mn 3.91 % MnO | |||
| Iron 9.23 % Fe 11.87 % FeO | |||
| Silicon 24.75 % Si 52.96 % SiO2 | |||
| Oxygen 42.30 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| KNa2LiFe2+1.5Mn2+0.5Ti2Si8O24 | |||
| Valid Species (Pre-IMA) 1893 | |||
| Benitoite mine, San Benito, Co., California, USA. Link to MinDat.org Location Data. | |||
| Named for Neptune, the Roman god of the sea, because it was found with aegirine, named for the Scandinavian god of the sea. | |||
| Carlosite | |||
| ICSD 71360 | |||
| PDF 43-677 | |||
Neptunite Image | |||
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Neptunite Crystallography |
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| a:b:c =1.3167:1:0.8008 | |||
| a = 16.46, b = 12.5, c = 10.01, Z = 4; beta = 115.4° V = 1,860.47 Den(Calc)= 3.24 | |||
| Monoclinic - DomaticH-M Symbol (m) Space Group: Cc | |||
| By Intensity(I/Io): 3.186(1), 9.6(0.6), 3.517(0.45), | |||
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Physical Properties of Neptunite |
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| [110] Good | |||
| Black, Red. | |||
| 3.23 | |||
| Translucent | |||
| Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz). | |||
| Crystalline - Coarse - Occurs as well-formed coarse sized crystals. | |||
| Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). | |||
| Tabular - Form dimensions are thin in one direction. | |||
| 5-6 - Between Apatite and Orthoclase | |||
| Non-fluorescent. | |||
| Vitreous (Glassy) | |||
| brown | |||
Optical Properties of Neptunite |
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| CI meas= 0.081 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= 0.084 (Poor) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2175,KPDmeas= 0.2182,KC= 0.2375 |
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| Biaxial (+), a=1.69-1.6908, b=1.6927-1.7, g=1.7194-1.736, bire=0.0294-0.0452, 2V(Calc)=36-56, 2V(Meas)=36-49. Dispersion r < v strong. | |||
| yellow orange. | |||
| orange. | |||
| deep red. | |||
Calculated Properties of Neptunite |
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relectron=3.16 gm/cc |
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| Fermion Index = 0.02793 Boson Index = 0.97207 |
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PENeptunite = 6.71 barns/electron |
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| GRapi = 60.73 (Gamma Ray American Petroleum Institute Units) Estimated Radioactivity from Neptunite |
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Neptunite Classification |
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| 70.4.1.1 (70)Inosilicate Column or Tube Structures | |||
| (70.4)with linked chains forming cages | |||
| (70.4.1)Neptunite group | |||
| VIII/F.37-10 VIII - Silicates | |||
| VIII/F - Inosilicates (chain and band) complex chain structure. Cylindric chains and others | |||
| VIII/F.37 - Neptunite series | |||
Other Neptunite Information |
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| NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8) | |||
| Links to other databases for Neptunite : 1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 - Amethyst Galleries' Mineral Gallery 5 - Applied Mineralogy 6 -Athena 7 - CalTech Mineral Spectroscopy 8 - EUROmin Project 9 - Glendale Community College 10 -Google Images 11 -Google Scholar 12 -Handbook of Mineralogy (MinSocAm) 13 -Handbook of Mineralogy (UofA) 14 - HyperPhysics 15 -MinDAT 16 -MinMax(Deutsch) 17 -MinMax(English) 18 -Mineralienatlas (Deutsch) 19 -QUT Mineral Atlas 20 - WWW-MINCRYST 21 -theimage 22 -École des Mines de Paris Search for Neptunite using: Visit our Advertisers for Neptunite : Translate Neptunite Mineral Data : Ask about Neptunite here : Print or Cut-and-Paste your Neptunite Specimen Label here :
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