I would like to learn more about this rock that I have come to inherit. It resembles a quartz, and after reading about this mineral I am curious if it is a milky Quartz. Anything you can teach me about this interesting rock would be appreciated! Here is some information to aide in identification.
The gem is opaque, brownish, and clear blue at different areas. It has an earthy/glass like lustre. It seems to have some areas that are layered. It is not easily broken and is pretty heavy for its size.
The origin location is unknown as I inherited it from my sister who received it from someone else.
The steel kitchen knife leaves a scratch on the surface.