1, omphacite and jadeite have different compositions. The chemical composition of omphacite is (Na, Ca)2-3Al3(Al, Si)2Si6O 18(OH)4, which belongs to silicate minerals. Emerald is a silicate mineral containing chromium, and its chemical composition is NaAlSi2O6, which belongs to silicate mineral.

2. The appearance of omphacite and jadeite is different. Omphacite usually appears in dark green, light green, yellow-green and other colors, and its crystals are flaky, massive or granular; Emerald is mainly green in color, delicate in texture and warm in luster, and is often used to make jewelry and handicrafts.

There are obvious differences in composition and appearance between omphacite and jadeite. They belong to different mineral species and have different chemical composition and appearance characteristics.