Minerals are naturally occurring substances which have a homogeneous nature. The entirety of a mineral has the same chemical composition. Rocks, by contrast, are comprised of many different materials, some or all of which may not be minerals at all.
This category has only the following subcategory.
- [+] Crystals (1 C, 41 P)
The following 49 pages are in this category, out of 49 total.