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اگرچه اصطلاح "گرانیت" گاهی اوقات به عنوان یک توصیف کلی برای هر سنگی که شبیه سنگ گرانیت است استفاده می شود ، اما این نام در واقع به سنگی با ترکیب معدنی بسیار خاص اطلاق می شود. سنگ گرانیت بیشتر از دو ماده معدنی تشکیل شده است: فلدسپات کوارتز و ارتوکلاز (یک نوع فلدسپات غنی از پتاسیم). کوارتز باید حداقل ۲۰٪ از سنگ و ارتوکلاز حداقل ۳۵٪ از سنگرا تشکیل دهد... See more
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