If you observe a wide variety of samples of quartz, which property is likely to change the most, from sample to sample because of minor impurities?

Which mineral always reflects nearly all the light that strikes a freshly broken surface?

Which mineral will scratch glass (hardness = 5.5) but not pyrite?

Which property of quartz is always the same from sample to sample?

What mineral property is shown being tested in the diagram?

The mineral shown to the right could not be

What is the name of the physical test shown?

According to the Earth Science Reference Tables, what is the percentage of the mineral potassium feldspar in a typical sample of granite?

What mineral is found in a wide variety of igneous rocks?

Which of the following is a fine-grained, dark-colored igneous rock?

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