Rubium splinters
“Be careful with these! They're unstable!”
MembersTradeable (not for Ironmen)High alch 9 gp
Sources from the OSRS Wiki's drop, shop and recipe data (CC BY-NC-SA 3.0), checked 2026-10-09; the verdict and ordering are ours, built from that data. Item sprite © Jagex.
Ironman verdict
Rubium splinters is a members item. Other players trade it, but an Ironman cannot use the Grand Exchange or trade, so you get your own. We list 1 other source for it.
It does not drop from monsters and no shop stocks it. It comes from Rubium rocks.
It is a material in 6 recipes, for example Bronze incendiary cannonball (5 Smithing), Iron incendiary cannonball (20 Smithing) and Steel incendiary cannonball (35 Smithing). High Alchemy (55 Magic) turns one into 9 coins. Each cast uses a nature rune, 180 coins from a rune shop, and five fire runes that a fire staff replaces, so an alch loses about 171 coins; only alch it to clear space.
Other sources
Minigames, reward chests, clues, skilling and other non-combat sources.
Used to make (6)
6 recipes use Rubium splinters as a material, lowest level first.
- Bronze incendiary cannonball10 used · 5 Smithing
- Iron incendiary cannonball10 used · 20 Smithing
- Steel incendiary cannonball10 used · 35 Smithing
- Mithril incendiary cannonball10 used · 55 Smithing
- Adamant incendiary cannonball10 used · 75 Smithing
- Rune incendiary cannonball10 used · 90 Smithing