• Forsterite and fayalite = endmembers of olivine solid solution
• Isolated SI04 tetrahedra, Mg2Si04
• Orthoromblc crystal system
• Colorless/yellow/green
• Hardness ■ 6-7, Density ■ 3,2-4,3
• vitreous luster, white streak, perfect cleavage on {100}
CYCLOSIUCATE TETRAHEDRA IN CYCLES GREEN
DENSITY=2,65
IMPERFECT CLEAVAGE
NESOSIUCATE ISOLATED TETRAHEDRA LIGHT GREEN
DENSITY > 3
PERFECT CLEAVAGE