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کانی گرافیت به دو روش طبیعی و مصنوعی تشکیل میشود. گرافیت طبیعی، محصول دگرگونی (کاهش شیمیایی) رسوبات حاوی مواد کربندار است. این کانی، در سنگهای آذرین و شهابسنگهانیز یافت میشود. برای تبدیل کربن به گرافیت، به دمای حدود 750 درجه سانتیگراد و فشار حدود 517 مگاپاسکال نیاز است. این محدوده دما و فشار، در بازه تشکیل رخسارههای دگرگونی گرانولیت قرار دا... See more
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