The search for universal laws of mental properties cannot be confined to neural correlates and chemical signals alone. Descriptions of subtle mental phenomena best fits characteristics of substance which today is categorized as Dark Matter. Physical concepts that describe spin, chemical bonds, molecular configurations and cellular structures can be extended to dark matter counterparts (axions), to yield an excellent physical model as a basis for the understanding of mental and psychic phenomena. Dark chemistry seems viable and natural. The mounting scientific evidence of different bands of biophotons from different taxa indicates a natural, most likely genetic, selectivity of different types of dark particles in different taxa. Mind and consciousness need not be mystical or magical.

: Dark matter, axions, biophotons, dark chemistry, spin pixels