Yu-stone may refer to either of two minerals:

Jadeite is a pyroxene mineral with composition NaAlSi2O6. It is monoclinic. It has a Mohs hardness of about 6.5 to 7.0 depending on the composition. The mineral is dense, with a specific gravity of about 3.4. Jadeitite forms solid solutions with other...

Actinolite is an inosilicate mineral with the chemical formula...