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Rock and Mineral Review Which type of scientist studies rocks? Geologist Which type of rock is formed by heat? Igneous Which type of rock is formed in layers? Sedimentary Which rock changed from an igneous or sedimentary over time? Metamorphic Minerals can be classified by their what? Properties Which property can describe a mineral as dull or shiny? LUSTER Which property can describe the way a mineral feels? Texture Which property can be described as translucent or opaque? Light What is the name of the scale used to show a mineral’s hardness? Mohs scale of hardness According to the scale what is the hardest mineral? Diamond According to the scale what is the weakest mineral? TALC