RAPAKIVI

RAPAKIVI (fini rapakivi — san­gi farsuda), granitest, ki az jihati sokht ba porfir monand ast. Tarkibashro ortoklaz (qarib 40%), olioklaz (sarib 20%), abraqi tira (qarib 3%), kvartsi ba idiomor­fizm duchorshuda (qarib 30%) va mi­neralhoi duyumdaraja: amfibol, or­tit, sfen, diopsid, magnetit, apatit (qarib 2%) tashkil medihand. Rangi Rapakivi odatan gulobii bur, surkhcha, bazan sabztob va hatto qarib siyoh meshavad. Rapakivi dar Finlyandiya, Shvetmiya va SSSR (RASS Karel., viloyati Lenin­grad, Ukraina) bisyor ast. Rapakiviro hamchun sangi qimatbaho dar sokhtmon va baroi ruykashi binoho istifoda mebarand. Nig. niz Granit.