tephroite-fayalite series

mineralogy

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July 14, 2026

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The tephroite-fayalite series refers to a group of minerals within the broader olivine family. Tephroite, a manganese silicate (Mn₂SiO₄), forms a solid solution with fayalite, an iron silicate (Fe₂SiO₄). This means that in the molecular structure, manganese can be completely replaced by iron, and vice versa, creating a continuous range of compositions between the two end-members.12

These minerals are typically found in iron-manganese ore deposits, skarns, and metamorphosed manganese-rich sediments. While olivines in general are common rock-forming minerals, tephroite and fayalite are more specifically associated with these particular geological environments.12

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tephroite
…Mn₂SiO₄) forms a solid solution series with the olivine fayalite in which iron completely replaces manganese in the molecular structure. For detailed physical properties, see olivine (table).
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…Mn₂SiO₄) forms a solid solution series with the olivine fayalite in which iron completely replaces manganese in the molecular structure. For detailed physical properties, see olivine (table).
Read More