ber l ite ▁indicator ▁min eral ▁in ▁areas ▁where ▁er os ive ▁activity ▁makes ▁pin ▁pointing ▁the ▁origin ▁of ▁the ▁pipe ▁difficult . ▁These ▁vari eties ▁are ▁known ▁as ▁chrome - py ro pe , ▁or ▁G 9 / G 1 0 ▁gar net s . ▁ ▁Min eral ▁identification ▁▁ ▁In ▁hand ▁spec imen , ▁py ro pe ▁is ▁very ▁tricky ▁to ▁distinguish ▁from ▁al m and ine ; ▁however , ▁it ▁is ▁likely ▁to ▁display ▁fewer ▁fla ws ▁and ▁inclus ions . ▁Other ▁distingu ishing ▁criteria ▁are ▁listed ▁in ▁the ▁adjacent ▁table . ▁Care ▁should ▁be ▁taken ▁when ▁using ▁these ▁properties ▁as ▁many ▁of ▁those ▁listed ▁have ▁been ▁determined ▁from ▁synth et ically ▁grown , ▁pure - com position ▁py ro pe . ▁O thers , ▁such ▁as ▁py ro pe ' s ▁high ▁specific ▁gravity , ▁may ▁be ▁of ▁little ▁use ▁when ▁studying ▁a ▁small ▁cry stal ▁embedded ▁in ▁a ▁matrix ▁of ▁other ▁sil icate ▁min er als . ▁In ▁these ▁cases , ▁min eral ▁association ▁with ▁other ▁ma fic ▁and ▁ul tr am af ic ▁min er als ▁may ▁be ▁the ▁best ▁indic ation ▁that ▁the ▁gar net ▁you ▁are ▁studying ▁is ▁py ro pe . ▁ ▁In ▁pet ro graph ic ▁thin ▁section , ▁the ▁most ▁distingu ishing ▁features ▁of ▁py ro pe ▁are ▁those ▁shared ▁with ▁the ▁other ▁common ▁gar net s : ▁high ▁relief ▁and ▁is ot ropy . ▁Gar net s ▁tend ▁to ▁be ▁less ▁strongly ▁col oured ▁than ▁other ▁sil icate ▁min er als