x ene ▁or ▁p ige on ite ▁with ▁abund ant ▁ol iv ine , ▁but ▁ol iv ine ▁may ▁have ▁r ims ▁of ▁py ro x ene ▁and ▁is ▁unlikely ▁to ▁be ▁present ▁in ▁the ▁ground mass . ▁Ocean ▁floor ▁bas al ts , ▁er upt ed ▁originally ▁at ▁mid - o cean ▁rid ges , ▁are ▁known ▁as ▁M OR B ▁( mid - o cean ▁r idge ▁bas alt ) ▁and ▁are ▁character ist ically ▁low ▁in ▁in compatible ▁elements . ▁ ▁Al k ali ▁bas al ts ▁typically ▁have ▁min eral ▁ass embl ages ▁that ▁lack ▁orth opy ro x ene ▁but ▁contain ▁ol iv ine . ▁Feld s par ▁phen oc ry st s ▁typically ▁are ▁lab r ador ite ▁to ▁and es ine ▁in ▁composition . ▁Aug ite ▁is ▁rich ▁in ▁tit an ium ▁compared ▁to ▁aug ite ▁in ▁th ole i it ic ▁bas alt . ▁Min er als ▁such ▁as ▁alk ali ▁f eld s par , ▁le uc ite , ▁ne ph eline , ▁sod al ite , ▁ph log op ite ▁m ica , ▁and ▁ap at ite ▁may ▁be ▁present ▁in ▁the ▁ground mass . ▁ ▁Bas alt ▁has ▁high ▁liquid us ▁and ▁solid us ▁temper atures — values ▁at ▁the ▁Earth ' s ▁surface ▁are ▁near ▁or ▁above ▁ 1 2 0 0   ° C ▁( liqu id us ) ▁and ▁near ▁or ▁below ▁ 1 0 0 0   ° C ▁( sol id us ); ▁these ▁values ▁are ▁higher