Examlex
Which of the following statements is correct?
Quartz
A very common rock-forming silicate mineral consisting of crystalline silica.
Feldspar
A very common rock-forming silicate mineral that is abundant in most igneous and metamorphic rocks and some sedimentary rocks.
Calcite
A common rock-forming calcium carbonate mineral occurring in limestone and a variety of water-related deposits.
Scratch Test
A method used in geology to determine the hardness or mineral composition of rock samples by scratching them with a harder material.
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