oil shale

noun 0.560

catlinite

noun 0.557

argillite

noun 0.555

smithsonite

noun 0.555

bituminous

noun 0.552

lawsonite

noun 0.549

colemanite

noun 0.540

bitumen

noun 0.532

gibbsite

noun 0.530

kerogen

noun 0.529

bornite

noun 0.519

pitchblende

noun 0.517

hectorite

noun 0.515

bentonite

noun 0.514

oil sand

noun 0.513

shale oil

noun 0.513

graphite

noun 0.513

coal oil

noun 0.511

illite

noun 0.510

black shale

noun 0.510

oil gas

noun 0.509

kieselguhr

noun 0.508

lithopone

noun 0.506

asphaltum

noun 0.506

gelignite

noun 0.504

vitrinite

noun 0.503

lampblack

noun 0.501

gas hydrate

noun 0.500