Silicon dioxide is dissolvable in water and has a high melting point because the atoms in the dioxide has a strong bond between them, which requires a lot of energy to break them.
Sublingual, IV, IM, insufflation, Skin absorbtion, Plugging, inhalation, eye absorbtion, and of course, swallowing. Discounting Skin and eye absorbtion, youve got 7 so i would go with that.
