"Diamantine" is a word in ENGLISH

Made of adamant, or having the qualities of adamant; incapable of being broken, dissolved, or penetrated; as, adamantine bonds or …

Like the diamond in hardness or luster.

Native tin dioxide; tin stone; a mineral occurring in tetragonal crystals of reddish brown color, and brilliant adamantine luster; also …

Native lead carbonate; a mineral occurring in colorless, white, or yellowish transparent crystals, with an adamantine, also massive and compact.

The earth alumina, as found native in a crystalline state, including sapphire, which is the fine blue variety; the oriental …

A rare mineral occurring in tetragonal crystals of a white, yellow, or grayish color and adamantine luster. It is a …

Ruby silver; dark red silver ore. It is a sulphide of antimony and silver, occurring in rhombohedral crystals or massive, …

A mineral usually of a reddish brown color, and brilliant metallic adamantine luster, occurring in tetragonal crystals. In composition it …