Magadiite Mineral Data + 
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- 78.7.12.1 Magadiite NaSi7O13(OH)3·4(H2O) Unk Mono
- VIII/H.39-10 Silhydrite 3SiO2·(H2O) P??? Ortho
- VIII/H.39-20 Magadiite NaSi7O13(OH)3·4(H2O) Unk Mono
- VIII/H.39-30 Stratlingite Ca2Al[(OH)6AlSiO2-3(OH)4-3]·2,5(H2O) R 3m 3 2/m
- VIII/H.39-40 Vertumnite Ca8Al4(Al4Si5)O12[(OH)36·10(H2O) P 21/a 2/m
General Magadiite Information |
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 Chemical Formula: |
NaSi7O13(OH)3·4(H2O) | ||
| Composition: |
Molecular Weight = 550.66 gm | ||
| Sodium 4.17 % Na 5.63 % Na2O | |||
| Silicon 35.70 % Si 76.38 % SiO2 | |||
| Hydrogen 2.01 % H 17.99 % H2O | |||
| Oxygen 58.11 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Empirical Formula: |
NaSi7O13(OH)3·4(H2O) | ||
| Environment: |
Associated with other rare alkalic minerals in brines with high Ph and silica content. | ||
| IMA Status: |
Approved IMA 1967 | ||
| Locality: |
Lake Magadi, Olduvai Gorge, Kenya. Link to MinDat.org Location Data. | ||
| Name Origin: |
Named for the locality. | ||
Magadiite Image | |||
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Images:
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Magadiite Crystallography |
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| Axial Ratios: |
a:b:c =1:1:2.1641 | ||
| Cell Dimensions: |
a = 7.25, b = 7.25, c = 15.69, Z = 2; beta = 96.8° V = 818.90 Den(Calc)= 2.23 | ||
| Crystal System: |
MonoclinicSpace Group: Unk | ||
| X Ray Diffraction: |
By Intensity(I/Io): 15.41(1), 3.435(0.8), 3.146(0.5), | ||
Physical Properties of Magadiite |
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| Color: |
White. | ||
| Diaphaniety: |
Transparent | ||
| Habit: |
Microscopic Crystals - Crystals visible only with microscopes. | ||
| Habit: |
Platy - Sheet forms (e.g. micas). | ||
| Habit: |
Powdery - Forms a loose, poorly-coherent pulverulent mass. | ||
| Hardness: |
2 - Gypsum | ||
| Luster: |
Vitreous - Dull | ||
| Streak: |
white | ||
Optical Properties of Magadiite |
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| Gladstone-Dale: |
CI calc= 0.087 (Poor) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2108,KC= 0.2307 |
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| Optical Data: |
Biaxial (?), a=1.47 | ||
Calculated Properties of Magadiite |
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| Electron Density: |
relectron=2.27 gm/cc |
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| Fermion Index |
Fermion Index = 0.01695 Boson Index = 0.98305 |
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| Photoelectric: |
PEMagadiite = 1.48 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Magadiite is Not Radioactive |
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Magadiite Classification |
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| Dana Class: |
78.7.12.1 (78)Unclassified silicates | ||
| (78.7)wholly unclassified silicates | |||
| (78.7.12)Dana Group | |||
| Strunz Class: |
VIII/H.39-20 VIII - Silicates | ||
| VIII/H - Phyllosilicates (layered) Mica minerals with tetrahedral-double layers and related structures | |||
| VIII/H.39 - Silhydrite - Vertumnite series | |||
Other Magadiite Information |
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| References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8) | ||
| See Also: |
Links to other databases for Magadiite : 1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 -Athena 5 - EUROmin Project 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 -École des Mines de Paris Search for Magadiite using: Visit our Advertisers for Magadiite : Translate Magadiite Mineral Data : Ask about Magadiite here : Print or Cut-and-Paste your Magadiite Specimen Label here :
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