▁fol iation ▁never ▁reaches ▁the ▁attitude ▁of ▁the ▁flow ▁plane ▁and ▁therefore ▁only ▁represents ▁a ▁part ▁of ▁the ▁entire ▁de formation ▁history . ▁ ▁Occ urrence ▁ ▁Ob lique ▁fol iation ▁has ▁been ▁found ▁mainly ▁in ▁mon o - min eral ▁rocks , ▁but ▁can ▁also ▁occur ▁in ▁poly - min eral ▁rocks . ▁The ▁structure ▁occurs ▁in ▁the ▁entire ▁ ▁met am orph ic ▁range ▁from ▁low - grade ▁to ▁high - grade ▁rocks . ▁Major ▁occurr ences ▁are ▁mon o - min eral ▁layers ▁of ▁quart z , ▁mus cov ite , ▁and ▁cal cite ▁in ▁layer ed ▁my lon ites . ▁The ▁structure ▁has ▁been ▁described ▁for ▁quart z ▁in ▁quart z ites , ▁for ▁cal cite ▁in ▁carbon ates ▁ ▁and ▁ ▁for ▁ol iv ine ▁in ▁per id ot ites . ▁Ob lique ▁fol iation ▁is ▁also ▁known ▁to ▁occur ▁in ▁rock ▁analog ues ▁like ▁ice ▁and ▁synth etic ▁oct ach lor op rop ane . ▁ ▁The oret ical ▁consider ations ▁ ▁The ▁angle ▁of ▁the ▁ob lique ▁fol iation ▁with ▁the ▁fabric ▁attract or ▁can ▁be ▁considered ▁theoret ically ▁as ▁a ▁function ▁of : ▁ ▁the ▁dynamic ▁v ort icity ▁( number ) ▁W k . ▁ ▁the ▁stra in ▁rate ▁d γ / dt . ▁ ▁the ▁rec ry st all isation ▁rate ▁( and ▁therefore ▁indirect ly ▁also ▁the ▁ambient ▁temperature ▁T ). ▁By ▁meas uring ▁the ▁angle ▁of ▁the ▁ob lique ▁fol iation , ▁attempts ▁have ▁been ▁made ▁to ▁determine ▁W k .