What is a gondite in geology ?

Gondite : definition

Gondites are very siliceous metamorphic manganese formations originating from non-calcareous sediments and therefore rich in manganese silicates (braunite, rhodonite, tephroite, etc...). They are found in old metamorphic bedrocks from India or South Africa. These are the manganiferous equivalents of the iron jaspilites.

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