a substance (such as quartz, coal, petroleum, salt, etc.) that is naturally formed under the ground. : a chemical substance (such as iron or zinc) that occurs ...
When you see a glittering crystal in our Museum you would probably say it was a
A naturally occurring, homogeneous inorganic solid substance having a definite chemical composition and characteristic crystalline structure, color, and ...
What is a
A mineral is a naturally occurring, inorganic solid, with a definite chemical ... To
a solid, naturally occurring inorganic substance, fizzy s...