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Answer for the clue "A rare light blue or green mineral ", 10 letters:
sapphirine

Alternative clues for the word sapphirine

Word definitions for sapphirine in dictionaries

WordNet Word definitions in WordNet
adj. made of or resembling sapphire n. a rare light blue or green mineral; consists of aluminum-magnesium silicate and occurs as small grains in some metamorphic rocks

Wiktionary Word definitions in Wiktionary
a. Of, pertaining to, or resembling sapphire n. (context mineralogy English) A rare silicate of magnesium and aluminium (with iron as a major impurity), named for its sapphirelike colour.

Wikipedia Word definitions in Wikipedia
Sapphirine is a rare mineral , a silicate of magnesium and aluminium with the chemical formula ( Mg , Al )(Al, Si ) O (with iron as a major impurity). Named for its sapphire -like colour, sapphirine is primarily of interest to researchers and collectors: ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Sapphirine \Sap"phir*ine\, n. Resembling sapphire; made of sapphire; having the color, or any quality of sapphire. ``Sapphirine degree of hardness.'' --Boyle.

Usage examples of sapphirine.

Ghosts--ghosts--the sapphirine air Teems with them even to the gleaming ends Of the wild day-spring!