Absences and silly games

I’m out of town for a week, supervising student mapping in the Barberton greenstone belt. Some scheduled stuff may or may not appear over the next few days.
People have previously tried to start games of Mornington Crescent in the comments whilst I’m away, but it seems that – shockingly people are bemused by the rules. So how about a geological word association game? I’ll start topically, with ‘komatiite‘. No target, beyond perhaps showing your mastery of geonerd terminology.
And if anyone does fancy a game of Mornington Crescent, make it easier to follow by sticking to the International Idiot Savant Variant, which forbids cross-hopping and counterclockwise movements on the Circle Line.