Yes, a good point. Obviously everything we have on earth is either naturally occurring or derived from naturally occurring substances. I don't have a problem with the "naturally occurring" part; the issue lies in the "derived" part.
H20 is naturally occurring. It can be lab synthesized. I would not consider lab synthesized water "natural," even though any metric we use to measure/compare it's qualities to natural water would yield no difference.
By "chemical," I meant a substance that is fabricated in a lab using "unnatural" methods. Of course, the phrase "unnatural" is completely subjective, so all I can really do is clarify my interpretation/opinion.
And of course, "natural" doesn't mean it's good for you (or the environment). Crude oil is natural.
From a philosophy standpoint, my rules would be something like this:
I am willing to use anything that is naturally occurring, or anything that is derived from a naturally occurring substance (or substances) using certain "crude" methods such as:
-mixing, grinding, blending, powdering, dissolving etc (obviously substances may react with one another at this point...)
-cultivating (farming, fermenting, etc
-crude extraction (dissolving etc).
(this is an incomplete list)
So as I define it
, the following would be "natural" aka "not chemical":
Any mined mineral (note some organic growing standards ban some mined substances)
(again, an incomplete list)
Obviously my opinions are completely subjective and may seem arbitrary to someone else.