is a Magnesium Iron Silicate with formula (Mg, Fe)SiO3 and hardness of 5-6.
Is a controversial name not well accepted by the scientist: see the Mindat:
Unnecessary name for member of Enstatite-Ferrosilite series; name discredited by the CNMMN Pyroxene Subcommittee (1988).
Regarded as a synonym of Enstatite or Ferrosilite, but commonly regarded as a mid-way member between these two end-members. Most "Hypersthene" is ferroan enstatite.
But, again ain order for th consumer to understand what we are talking about we can still call hypersthene.
Is a common ornamental stones with a nice interesting luster and optical effect. Hand polished on both side.
It comes from Labrador, Canada.