Provide your best answer for the following question. Give ONLY the answer, no other words or explanation.
For example:

Answer: <most likely answer, as short as possible; not a complete sentence, just the answer!>.

The question is: Most sand is made of quartz and has a white or brownish color. A student walking on a beach in Hawaii notices the sand is black in color. This sand most likely came from which type of rock?
Basalt.