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oil shale
chem.	esquisto aceitoso
environ.	pizarra bituminosa
geol.	esquisto petrolífero; lutita de petróleo
mining.	esquisto bituminoso
oil shale A kerogen-bearing, finely laminated brown or black sedimentary rock that will yield liquid or gaseous hydrocarbons on distillation
environ.	pizarra bituminosa

oil shale : 10 phrases in 6 subjects

Chemistry	3
Electronics	1
General	1
Geology	1
International Monetary Fund	2
Oil / petroleum	2