Chromium is a rare mineral.
It is a mineral found in the caverns in Serenia. It is likely metallic and crystalline.
Chromium is resistant to magic.
Graham once mined a piece during his adventures in Serenia (KQGS). He later crafted it into a lock that was resistant to magic and required multiple keys.
Behind the scenesEdit
Chromium is an actual element metal, that can have crystalline forms.
In the computer versions of KQ5 the crystal shatters after reflecting the magic, but in KQ5 on the NES the crystal remains intact and Graham continues to carry it with him.