Not by nature, it's not. Unless you define it to have some immeasurable spiritual quality to it which is obviously not experimentally discoverable and so of little use discussing here.
> This is where the pillar of quantifiability breaks down, and barring advances in techniques for inspecting the brain with greater spatial and temporal resolution it's hard to see how one can quantify what cannot be directly observed.
Pretty much every experiment has a massive amount of relevant states which we cannot quantify.
There's a whole lot of quarks in 1 kg of steel but we don't need to know all of their states to measure macro quantities like its temperature and strength.
The mind has proven very reluctant to this sort of useful and measurable macro properties.
It's a typical case of a chaotic system. Perhaps innovations in the modeling of such complex systems (not too different from the advancements we're seeing in ML) will be the key to better insights into the mind.