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Magadiite Mineral Data
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General Magadiite Information
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Chemical Formula: |
NaSi7O13(OH)3•4(H2O) |
Composition: |
Molecular Weight = 550.66 gm |
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Sodium 4.17 % Na 5.63 % Na2O |
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Silicon 35.70 % Si 76.38 % SiO2 |
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Hydrogen 2.01 % H 17.99 % H2O |
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Oxygen 58.11 % O |
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______ ______ |
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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. |
Name Pronunciation: |
Magadiite + Pronunciation |
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Magadiite Image |
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: |
Monoclinic Space Group: Unk |
X Ray Diffraction: |
By Intensity(I/Io): 15.41(1), 3.435(0.8), 3.146(0.5), |
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Physical Properties of Magadiite
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Color: |
White. |
Diaphaneity: |
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 |
Luminescence: |
Fluorescent, Short UV=yellow-white, Long UV=yellow-white. |
Luster: |
Vitreous - Dull |
Streak: |
white |
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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 Ncalc = 1.51 |
Optical Data: |
Biaxial (?), a=1.47 |
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Calculated Properties of Magadiite
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Electron Density: |
Bulk Density (Electron Density)=2.27 gm/cc note: Specific Gravity of Magadiite =2.23 gm/cc. |
Fermion Index: |
Fermion Index = 0.01 Boson Index = 0.99 |
Photoelectric: |
PEMagadiite = 1.48 barns/electron U=PEMagadiite x rElectron Density= 3.36 barns/cc. |
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: |
78.07.12.01 (78)Unclassified silicates |
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(78.07)wholly unclassified silicates |
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(78.07.12)Dana Group |
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78.07.12.01 Magadiite NaSi7O13(OH)3•4(H2O) Unk Mono |
Strunz Class: |
09.EA.20 09 - SILICATES (Germanates) |
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09.E - Phyllosilicates |
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09.EA -Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings |
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09.EA.20 Magadiite NaSi7O13(OH)3•4(H2O) Unk Mono |
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Other Magadiite Information
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References: |
NAME( Dana8) PHYS. PROP.(www.saint-hilaire.ca) 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 - Ecole des Mines de Paris
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info
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Print or Cut-and-Paste your Magadiite Specimen Label here :
Magadiite
NaSi7O13(OH)3•4(H2O)
Dana No: 78.07.12.01 Strunz No: 09.EA.20
Locality:
Notes:
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