Its simple, see a lot of people would have guessed a geode is a mineral or a gem. But its not. Geode is a sedimentary rock so instead of looking for the luster steak and hardness look facts on it like from its sedimentary form. A geode might have minerals in it, but that doesn't make it a mineral itself.
the empress geode of urnguary
A geode with a flint in it is called a "nodule".
a geode
The geode crystal for February is Amethyst
I'm taking this geode with me.
Geode is a rock or stone with crystals.
The found the geode while travelling through the caves. This is a sentence containing the word geode.
a geode bro
Geode is a rock or stone with crystals.
I have a geode which has been cut in half and polished
A geode.