ten i6id

[TÆNIOID.] těn'-nant-ite, subst. [After the English chemist Smiths on-Tennant; suff. -ite ( Min.).] Min.: An isometric mineral, occurring mostly in crystals. Hardne , 3'5-4; specific gravity 4-37-4'53; 4032 luster, metallic, becoming very dull on long exposure to light; color, blackish-gray to iron black; streak, dark-gray. Composition: A sulph arsenite of copper and iron, with the formula 4 (Cu, Fe) S+AS2S3. The finest crystals have been hitherto found in the mines of Cornwall.