Answers (2)
"Definition: Non-metallic mineral reserves consist of stone quarries and clay and sand pits; chemical and fertiliser mineral deposits; salt deposits; deposits of quartz, gypsum, natural gem stones, asphalt and bitumen, peat and other non-metallic minerals other than coal and petroleum.
OECD Glossary of Statistical Terms - Non-metallic mineral reserves Definition
OECD.Stat › glossary › detail.asp?ID=1815
A mineral is anything you mine. So if you dig bat poop, that is a non-metallic mineral called guano. Even though it is an animal product.
If you look at a periodic table, there is a diagonal line, B-C, Si-P, Ge-As, Sb-Te, and Po-At. Elements to the left of the line are metals, meaning they lose an electron easily, elements to the right of the line are non-metals, and elements on the line are semiconductors.