8.5 cm Lemon Quartz Point

This is lemon quartz. Lemon quartz is also known as Oro Verde quartz. It has a hardness of 7 on the Mohs scale and is created by irradiating quartz.

Not all quartz can be made into lemon quartz. For example, most aluminum-rich quartz turns black when irradiated, and is sold as smokey quartz.