Insight

These posts aim to educate or provide material for thoughts.

TAS diagram

QAPF diagram

Minerals in sand according to Devismes

What do you mean “hydrothermal”?

What makes minerals brittle

Is Papakolea the only green beach

How to remove dust from macro photos

How to take good macro photos

Highest volcanoes are in South America. Why?

Heavy minerals

Sand that remembers the rock it once was

Brain games with sand grains