Le Rocks

 Calcite

 Mica

 Amethyst

 Quartz with gold

 Minecraft Obsidian

 Limestone cavern (Raccoon Mountain)

 

Le Maps.
 Chlroropleth

 Isarithmic

 Dot density (Yes I know this is not a man made map, but it kinda is, and it sorta fits as an natural dot density)

 Proportional Symbol

 My Georgia rain isarithmic map.