1) Beautiful stone 2) Cut mineral 3) Decorative stone 4) Deep black garnet variety 5) Gemstone mineral 6) Gemstone 7) Jewel mineral 8) Jewel 9) Mineral jewel 10) Mineral gemstone 11) Polished mineral 12) Polished jewel 13) Prized mineral 14) Precious gemstone 15) Prized stone 16) Precious stone 17) Precious gem Found on https://www.crosswordclues.com/clue/melanite
(from the article `andradite`) ...and yellowish green or emerald-green (Uralian emeralds, or demantoid). Titanium may extensively replace both the iron and the silicon, as in ... Found on http://www.britannica.com/eb/a-z/m/66
Mel'a·nite noun [ Greek me`las , -anos , black: confer French mélanite .] (Min.) A black variety of garnet. Found on http://www.encyclo.co.uk/webster/M/43