How would you differentiate amphibole from olivine?

Amphibole and olivine can be differentiated based on their mineral structure and composition. Amphibole is a complex silicate mineral with a double-chain structure, typically containing hydroxyl groups (OH) and exhibiting a range of colors, while olivine is a simple silicate with a single-chain structure, primarily composed of magnesium and iron silicate (Mg, Fe)2SiO4. Additionally, olivine commonly appears green and has a glassy luster, whereas amphibole can exhibit a more varied color palette and often has a more fibrous or prismatic habit. Lastly, amphibole has a lower hardness than olivine, making it easier to scratch.