In general, we may think of minerals as the materials of which the rocks of the earth's crust are made, and, as such, minerals constitute the most important physical and tangible link with the earth's history. The mineralogist regards the minerals he finds in rocks and veins as the stable end products of a complex of natural processes which it is hi…
Resesi ekonomi dan krisis energi yang melanda dunia di tahun-tahun terakhir ini terutama di negara berkembang seperti juga di indonesia hal ini di pengaruhi kebijaksanaa pemerintah dibilang pertambangan ,terutama setelah menurunnya devisa negara di bidang minyak bumi