Did you find some Shock Crystals in the Cyclops' Ceramic Jars? You must be curious about their origin.
I mentioned the seal on the Prism Island some time ago. An interesting connection exists between these two events and it's well worth looking into.
Legend has it that Prism Island itself is a huge holy triangle ward. Ordinary people can't sense the power of the seal, so many people live here completely unaffected.
Scholars of magic seals however all agree that the Magic Pressure (Note 1) of Prism Island is more than ten times greater than a normal magic field, a very staggering number.
(Note 2) Magic Pressure: A measurement unit used by the Magic Academy to measure magic power. Normal magic pressure is defined as 1 and a place must have over 5 in magic pressure to qualify as a magic field.
*Once quest is complete, read this book to report back
The output of the Prism Island mining industry was mainly gold. As the gold supply depleted and a crystal mine was discovered, the crystal mining industry gradually replaced the gold mining industry.
Most research indicates that the heavy magic pressure that exists on the island effectively crystallized various minerals.
Though this hypothesis has yet to be confirmed, it explains why miners find so many crystals on Prism Island.