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High-Resolution Electron Microscopy of Antigorite and Olivine Relations in Silicate Minerals

This study explores the structural characteristics and optical properties of antigorite, talc, and serpentine minerals, focusing on their electron microscopy images. The particular emphasis is on the lamellar structure of antigorite found in Moses Rocks, Colorado, and the maillée texture observed in ophiolite cupriferous sites in Oman. The crystallographic orientation relationships between antigorite and olivine highlight their topotactic connections, which are essential for understanding their formation and alterations. This research contributes to the broader knowledge of silicate mineralogy.

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High-Resolution Electron Microscopy of Antigorite and Olivine Relations in Silicate Minerals

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  1. SHEET SILICATES (Baronnet et al., EURESCO, 2005) (sandwich) (toast) Mg(OH)2 b=9.3A SiO4 b=8.7A TALC SERPENTINE

  2. SERPENTINES Images microscopie électronique haute résolution A. Baronnet antigorite chrysotile Lamelles // (001) Optique: allongement + Tubes // [010] Optique: fibres allongement +

  3. I ANTIGORITE

  4. RAPPEL D’OPTIQUE CRISTALLINE LAME AUXILLIAIRE (GYPSE) Superposée à ng => teinte monte Superposée à np => teinte descend - ng N’g np ng + np

  5. Antigorite lamellaire Moses Rocks, Colorado (60% altération) LP LP + lame onde N’g

  6. Antigorite lamellaire Moses Rocks, Colorado LP LP + GYPSE antigorite N’g olivine antigorite

  7. Antigorite maillée (mesh) Site cuprifère, ophiolite d’Oman (90% altération) N’g 100µm

  8. Antigorite maillée (mesh) Site cuprifère, ophiolite d’Oman (zoom) N’g 100µm

  9. relation 1 (100)Olivine || (001)Antigorite [001]Olivine || [010]Antigorite Pourquoi? Parce que Antigorite et Olivine ont les relations topotactiques suivantes: relation 2 (010)Olivine || (001)Antigorite [001]Olivine || [010]Antigorite Image A. Baronnet CTEM data

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