However, depending on the context, you could use these options:
* 'ōni'oni'o: This term refers to a small, glassy object, and could be used to describe a small crystal.
* pōhaku aniani: This literally translates to "glass stone," which could be used to describe a crystal based on its appearance.
* pōhaku ʻālohilohi: This translates to "shining stone" and could be used to describe a crystal that reflects light.
Ultimately, the best way to express "crystal" in Hawaiian would depend on the specific context and what aspect of the crystal you want to emphasize.