ABRAQ

ABRAQ – (ba zaboni russi slyuda) minerali alyumosilikatie, ki sokhtash varaqin ast. Abraq garmitobovar buda, jarayoni elektrikiro nameguzaronad va tarkibi khimiyaviash murakkabu tagyiryobanda meboshad. Formulai umumiash:

R₁R₂.₃[AlSi₃O₁₀](OH.F)₂, ki dar in jo R,=K, Na; R. =A1, Mg, Fe, Li meboshad. Az rui tarkib Abraq magniyu ohandor (fogopit, biotit, lepidomelan), alyuminiydor (musko­vit, paragonit) va litiydor (lepi­dolit, sinnvaldit, tayniolit) me­shavad. Sistemai kristallbandiash monoklini. Kristallhoyash varaq-varak, takhta-takhta yo pulakchamonand shuda, dar kundalangi to ba 1 metr me­rasand. Sakhtii kristallhoi Abraq az rui shkalai mineralogi 2,5 – 3, zichiashon 2700 – 3200 kilogramm/metr³ meboshad.

Abraq dar tabiat bisyor vomekhurad va chun mine­rali jinsofarin dar tarkibi bisyor jinshoi intruzivi (granitho, sienitho, dioritho), metamorfi (gneysho, varaqsanghoi kristalli va gayra) duchor meoyad. Abr masolekhi muhim baroi termoizolyatsiya va elektroizolyatsiya buda, dar sohai eklektrotekhnika, aviatsiya va radiotekhnika vase istifoda meshavad. Az lipidolitho shishahoi makhsusi optiki mesozand.

Rezamaydahoi Abraqro dar sokhtmon, sanoati rezina, istehsoli plastmassa, rang va gayra vase ba kor mebarand. Dar Tojikiston koni khurdi Abraq dar qatorkuhi Ishkoshim mavchud ast.