Hypersthene, properly known as Enstatite-Ferrosilite, is normally found in volcanic or high-grade metamorphic rock. It combines and hardens with the minerals Enstatite and Ferrosilite.  Hypersthene is the name given to the mineral when significant amounts of both Iron and Magnesium elements are present, since pure Enstatite does not contain any iron, whilst pure Ferrosillite does not contain any magnesium.
 
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* Sizes, shapes and colors my vary due to being a natural stone, being hand-carved and/or difference in computer monitors.