The most commonly occurring form of tin ore; cassiterite, native tin dioxide (peroxide). Also attrib.
1602. Carew, Cornwall, 86. They discouer these workes, by certaine Tynne-stones, lying on the face of the ground.
1671. Phil. Trans., VI. 2098. Most Tin-stones are porous, not unlike great bones almost throughly calcined.
1805–17. R. Jameson, Char. Min. (ed. 3), 210. Annular tinstone … is a four sided prism, truncated on all the edges and angles.
1839. Ure, Dict. Arts, 1241. There are only two ores of tin; the peroxide, or tin-stone, and tin pyrites.
1905. Times, 11 Aug., 3/4. In the tinstone works of Malacca.
