▁quart z ▁can ▁change ▁its ▁modification ▁from ▁α ▁to ▁ β ▁and ▁back ▁again ▁without ▁crack ing , ▁as ▁long ▁as ▁the ▁temperature ▁change ▁is ▁less ▁than ▁ ▁per ▁minute . ▁For ▁this ▁reason , ▁cra cks ▁caused ▁by ▁solar ▁radiation ▁or ▁fire ▁can ▁be ▁ruled ▁out . ▁ ▁An ▁enorm ous ▁pressure ▁of ▁about ▁ ▁can ▁be ▁estimated ▁by ▁the ▁presence ▁of ▁co es ite ▁re lic ts , ▁the ▁rare ▁high - press ure ▁polym orph ▁of ▁quart z . ▁ ▁This ▁light ning - indu ced ▁weather ing ▁is ▁one ▁of ▁the ▁more ▁important ▁starting ▁mechan isms ▁for ▁other ▁weather ing ▁processes . ▁Because ▁of ▁the ▁increase ▁in ▁surface ▁area , ▁chemical ▁weather ing ▁can ▁attack ▁each ▁newly ▁made ▁fragment ▁from ▁all ▁sides ▁and ▁can ▁go ▁deeper ▁into ▁bed rock ▁as ▁new ▁cra cks ▁are ▁formed ▁or ▁older ▁ones ▁extended . ▁Thus , ▁elect rome chan ical ▁dis integration ▁is ▁a ▁new ▁term ▁for ▁a ▁type ▁of ▁weather ing ▁as ▁old ▁as ▁the ▁planet ' s ▁l ith os phere , ▁and ▁it ▁represents ▁an ▁important ▁ex ogen ic ▁process ▁for ▁the ▁beginning ▁of ▁er os ion ▁and ▁the ▁formation ▁of ▁so ils . ▁ ▁See ▁also ▁▁ ▁Ful g ur ite ▁ ▁E ros ion ▁ ▁Notes ▁ ▁References ▁▁ ▁Bank o , ▁A . ▁G ., ▁J . ▁Kar f unk el , ▁W . ▁Had rian , ▁and ▁F . ▁No ack . ▁ 2 0 0 2 . ▁" B ras ilian ische ▁Bl itz qu