Magadiite

General Information:
 Chemical Formula:
NaSi7O13(OH)3·4(H2O)
 Composition:
(Molecular Weight = 550.66 gm)
Sodium 4.17 % Na
Silicon 35.70 % Si
Hydrogen 2.01 % H 
Oxygen 58.11 % O 
 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.
 Name Origin:
Named for the locality.
Physical Properties:
 Color:
white.
 Diaphaniety:
Transparent
 Habits:
Microscopic Crystals - Crystals visible only with microscopes., Platy - Sheet forms (e.g. micas)., Powdery - Forms a loose, poorly-coherent pulverulent mass.
 Hardness:
2 - Gypsum
 Luster:
Vitreous - Dull
 Streak:
white
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