resinite
/ˈrɛzɪnʌɪt/ /ˈrɛz(ə)nʌɪt/noun
1 Mineralogy. Originally: (more fully quartz-resinite) a siliceous material of resinous or opaline appearance. In later use: fossilized resin, especially as a constituent (maceral) of coal, in which it typically occurs as elliptical or spindle-shaped bodies.
2 Chemistry. A synthetic resin produced by the condensation of phenol and formaldehyde. Compare resite. Now historical and rare.
Origin
Early 19th century; earliest use found in Philosophical Transactions of the Royal Society of London. From resin + -ite. In sense 1 after French résinite, adjective (R. J. Haüy Traité de minéral. II. 433 in quartz résinite; the use as noun is apparently not paralleled until slightly later).