RU'BELLITE, noun [from Latin rubeus, red.] A silicious mineral of a red color of various shades; the red shorl; siberite. It occurs in accumulated groups of a middle or large size, with straight tubular-like stria. In a red heat, it becomes snow-white and seems to phosphoresce. Rubellite is red tourmaline.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI