Well, does anyone at what point something is termed organic?? For instance, worm castings and humus are organic material... theres organic fertilizers and organic pesticides and like you stated theres organic special potting blends...
And i beleive vermaculite is made from type of clay found in arid reagons. I guess my point is, organic substances also contain some of the same elements/nutrients that a minerals soil would.... so what is the difference between an all organic blend to a non-organic one, other then being composed of animal and plant residues. From what i am told, a perfect soil is 25% air 25% water space, 5-10 % organic matter, and 40-45% mineral.