Probably harilik kuusk, Norway spruce, Picea abies. Tree parasitized by Ips typographus, the only bark beetle ever to feature in a blue movie, Der blaue Engel, alongside Marlene Dietrich. Shortened to Kuu from 1940-1941.
Quartz, silex (or silica as adjective for soil types), after local factory of same name. Part of a sand and concrete materials group, see Kvartsliiva.
Monomeric quartz sand, after local factory of same name. Part of a sand and concrete materials group, see Räniliiva.