Positive feedback from a capacitive divider indicates the oscillator type is:

In electronic oscillator design, the method used to feed energy from the output back to the input defines the oscillator type. A Colpitts oscillator is specifically characterized by its use of a capacitive voltage divider to provide this positive feedback. The resonant tank circuit of a Colpitts oscillator consists of an inductor in parallel with two series capacitors. The feedback signal is tapped from the connection point between these two capacitors, routing a portion of the oscillating energy back to the input to sustain the cycle. By contrast, a Hartley oscillator uses an inductive divider (a tapped coil) for its feedback. While the Miller and Pierce are crystal-based oscillators, the defining textbook characteristic of a purely capacitive voltage divider in an LC circuit points directly to the Colpitts.