Do the glowing blocks of crimson ore spread the crimson?

[mr.j.j.borreli]

I'm not sure what the blocks are call because I cannot mine them yet. I find them occassionally when mining and they glow so they are easy to see. Usually in groups of 2-3.

Do they spread the corruption/crimson (again not sure what to call it but the red area with the harder monsters).

Sorry for the noob questions I just want to know if I should remember to come back for these guys later

[Dos Chorizos]

No, crimtane ore does not spread crimson fortunately

Crimson is spread by crimstone, crimson grass (and all crimson grass backdrops), crimsand, hardened crimsand, crimsandstone, and red ice. Crimson background walls will not spread crimson. The variants for hallow and corruption also apply, respectively. Crimson/corruption will barely spread in normal mode, getting more aggressive in hardmode, and slowing slightly after defeating plantera. Breaking crimson altars creates a random patch of crimson somewhere in the world.

[mr.j.j.borreli]

Beautiful answer thank you! Explained everything and more!

[Dos Chorizos]

No prob XD