Discussion
Quartz makes a durable aggregate chiefly because it is
Answer: D
Correct answer: hard and chemically resistant
Quartz is hard at 7 on the Mohs scale, has no cleavage to provide a plane of weakness, and is chemically inert to almost everything encountered in service. Those three properties together are why quartz sand and quartzite make durable aggregate and why quartz is the mineral that survives in a sediment after everything else has weathered away.
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