Silicon is Deposited in Leaves of New Guinea Impatiens

Fig. 5. Spectrographs of Si-treated (A) and not treated (B, control) leaf margins. The spectrograph was able to detect Si in significant amounts in the Si-treated samples (above background levels), but was not able to detect Si in the control plants.



Image from Plant Health Progress article:
Silicon is Deposited in Leaves of New Guinea Impatiens