what are the 6 characteristics of rocks?
['6 Characteristics for Rocks And Minerals! There are 6 types of characteristics for rocks and minerals. ... ', 'Hardness. The mohs hardness scale.', 'Lustre. The lustre comparison.', 'Colour. This is a comparison of different colours of the minerals.', 'Crystal Structure. ... ', 'Streak. ... ', 'Cleavage and Fracture.']