[mass noun]a mineral occurring as white to pale green crystals in metamorphic and basic igneous rocks. It consists of a calcium and magnesium silicate of the pyroxene group, often also containing iron and chromium 透辉石
语源
early 19th cent.: from French, formed irregularly from di- 'through' + Greek opsis 'aspect', later interpreted as derived from Greek diopsis 'a view through'