Ferrite can be mixed with different magnetic concentrations (L), binders (C), and nickle (Ni) (low R) or Manganese (Mg) (higher R) , or inductance, lower or raise eddy current losses into a brittle ceramic package. Higher mu ferrite might be measured by high insulation properties of core resistance which is best for low frequencies. Losses must be tested with some measurement device.
Generally going to higher frequency, one must transition to lower permeability and lower resistance ferrite until going to air loops.
The impedance is defined below ferrite losses as Z=DCR+ jX(f), X(f) = 2pi*f*L
ζ=R/X(f) or Q = ωL/R and DCR is the DC resistance of wire not incl. skin effects.
Thus if you saw a tuneable inductor at 11 MHz for the FM IF it will be ferrite. But if you need a high current inductor > 300 MHz it would be a small L air coil with L~8nH/cm for straight wire and much higher when coiled in a loop. At even higher frequencies it is likely to be a half-wave stripline.