Question

A student brings two rock samples to class. Rock 1 has very small mineral grains that can only be seen with a hand lens. Rock 2 has much larger mineral grains that are easy to see without a hand lens. Which of these MOST LIKELY caused the difference between the two rocks?

Answer 1

Fine grained rocks, where the individual grains are too small to see, are called aphanitic. Basalt is an example , The most common glassy rock is obsidian.

Answer 2

Explanation:

Fine grained rocks, where the individual grains are too small to see, are called aphanitic.