mineralogy
scientific study of minerals
enstatite
pyroxene mineral
aegirine-augite
pyroxene mineral, compositions ranging from (aegirine 80% - wollastonite 20%) to (aegirine 20% - wollastonite 80%)
jadeite
pyroxene mineral
hedenbergite
pyroxene mineral
gemology
science dealing with natural and artificial gems and gemstones
crystallography
scientific study of crystal structures
pigeonite
pyroxene mineral