Since I don't know from yout question whether you are asking about color, density, or weight, I'll just sen this article that goes into detail about olivine rocks. Olivine - Wikipedia. read more
Olivine is characterized by a high birefringence, distinctive fracturing, lack of cleavage (conchoidal fracturing), and alteration products. Pyroxenes exhibit lower birefringence, have a discernible cleavage, sometimes exhibit lamellar twinning, and may display a pale green color. read more
Basalt is available in black, brown, light to dark grey colors whereas, Andesite is available in bluish - grey, grey, pink, yellow colors. Appearance of Basalt is Dull and Soft and that of Andesite is Dull and Soft. Properties of rock is another aspect for Basalt vs Andesite. The hardness of Basalt is 6 and that of Andesite is 7. read more