ग्रेनाइट
grenait (aangrezi: Granite) ek prakar ki manibhiy danedar shila hai. isake pramukh avayav sphatik[1] aur phelspar[2] haian. grenait prithvi ke pratyek bhag mean paya jata hai. bharat mean bhi yah prachurata se milata hai. maisoor, uttar arkat, madras, rajapootana, salem, buandelakhand aur sianhabhoomi mean yah paryapt matra mean prapt hota hai. himalay pradeshoan mean bhi grenait shilaean vidyaman haian.
avayav
'grenait' shabd ka sarvapratham upayog prachin italiyan sangrahakartaoan ne kiya tha. rom ke shilpakar phleminiyas veka ke ek varnan mean isaka pratham sandarbh milata hai. sadharanat: grenait manibhiy danedar shila hai, jisake pramukh avayav 'sphatik' aur 'phelspar' haian. phelspar sadharanat: potash kism ka aaurthokles aur maikroklain[3] hoti hai, athava sodiyam kism ka plaigiokles[4] ailbait[5] ya auligokles.[6] sphatik sadharanat: varn rahit roop mean hi rahata hai, par kabhi-kabhi kuchh nili abha rahati hai, jisase grenait ka rang kuchh nilapan lie hota hai. isamean abhrak, maskovait[7] aur bayotait[8] bhi alp matra mean rahate haian.[9]
maignitait[10], aipaitait[11], jarakan[12] tatha sphin[13] bhi b de sookshm manibhoan ke roop mean grenait mean rahate haian. kisi kisi namoone mean h aaurnableand [14], garnet[15] aur turamali[16] bhi pae ge haian. in khanijoan ki upasthiti ke karan aise grenaitoan ko kramash: haurnableand grenait, maskavait grenait aur bayotait grenait bhi kahate haian.
rang
grenait anek rangoan ka paya jata hai. potash grenait gulabi ya lal rang ka hota hai tath choona grenait dhoosar ya shvet rang ka. grenait ka vishisht ghanatv 2.51 se 2.73 tak hota hai.
udbhav
isake ke udbhav ke sanbandh mean vaijnanik ekamat nahian haian. kuchh vaijnanikoan ka mat hai ki isaka udbhav drav pattharoan ya 'maigma'[17] ke dhire-dhire thandha hokar thos banane se hua hai. inamean se kuchh isaka nirman grenait maigma se aur kuchh baisaltiy maigma se manate haian. kuchh vaijnanikoan ka yah vichar hai ki poorvasthit shilaoan ke grenait banane vale nirgamoan[18] ki pravaran [19] kriya se, athava grenait banane vale abhikarmakoan dvara, jinako sederahom[20] ne ayakari nam diya hai, grenait bane haian.
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tika tippani aur sandarbh
sanbandhit lekh