If you are referring to the flashing blue brick, underground..
That brick is called demonite i'm pretty sure, if not. I'm sorry.
A person named Blue.
monkey
Because they have a bluish tinge to their colour.
Terraria happened in 2011.
Blue stones are named as such because of their natural blue coloration. This color can be caused by various factors, such as the presence of minerals like lazurite in lapis lazuli or copper in turquoise. The characteristic hue of blue stones sets them apart from other gemstones.
plasma
Search "Terraria invedit" on youtube.
Just Google Terraria servers and copy the ip address into the multiplayer slot on terraria.
plasma
If you have Terraria on Steam it updates itself once an update is available.
That's the only time you can get the blue first on Jin.
Terraria is a one-time purchase. There are no additional fees or payments.