Prismatic as a stone
Crossword Clue

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AnswerCrossword Clue
OPALINEPrismatic, as a stone
tourmaline(French) a brittle boron aluminosilicate mineral with a glassy lustre, occurring as prismatic crystals of the trigonal system
tourmalinesTOURMALINE, (French) a brittle boron aluminosilicate mineral with a glassy lustre, occurring as prismatic crystals of the trigonal system
stibnitesA lead-gray mineral, typically occurring as striated prismatic crystals, that consists of antimony sulfide and is the chief ore of antimony
pyroxenesAny of a large class of rock-forming silicate minerals, generally containing calcium, magnesium, and iron and typically occurring as prismatic crystals
euclasea mineral that consists of a brittle silicate of beryllium and aluminum in pale yellow, green, or blue prismatic crystals and is used especially as a gemstone
tourmalineA brittle gray or black mineral that occurs as prismatic crystals in granitic and other rocks. It consists of a boron aluminosilicate and has pyroelectric and polarizing properties, and is used in electrical and optical instruments and as a gemstone
tourmalinesA brittle gray or black mineral that occurs as prismatic crystals in granitic and other rocks. It consists of a boron aluminosilicate and has pyroelectric and polarizing properties, and is used in electrical and optical instruments and as a gemstone