MagicalMineral

• Gundam has Gundinium (or some such)
  
• MagicKnightsRayearth? has Escudo
  
• A few things have Adamantium (notably Wolverine and the X-men universe, but I'm sure it's cropped up elsewhere)
  
• Orihalcon (sp?) seems quite widespread (HyperPolice comes to mind)
  

Do you mean orichalcum?

Presumably. The RPG Exalted has five magical materials, one for each class of heroes - orichalcum, moonsilver, starmetal, jade and soulsteel. Of these, only orichalcum and jade actually exist, although the description of starmetal suggests "iridium".

In HyperPolice and Slayers, it's definitely 'orihalcon'. But that could be a variant of 'orichalcum' - SunKitten

I always thought of starmetal as being meteoric iron.  It's very different from normal iron in most fantasy settings.

• Does dilithium crystal count? Or is it a power source?
  
• In some mythologies, Mythril is a MagicalMineral, and/or the 'hardest'/'sharpest'/etc mineral around. In others, it's just a metal like silver.
  
• Neutronium.  Pure squashed neutrons...!
  
• And how could anyone forget Kryptonite!
  
• ADoM has eternium.  It also has mithril and adamantium, but they're not as generally shiny as eternium.
  
• Somehow the spice Melange got missed off this list, possibly for not being hard or sharp
  
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• Escaflowne? has the 'dragon heart'
  
• LastExile has Claudia, which may not be a power source but does rather help the flying ships keep flying.  PatapataHikosenNoBouken? has, I'm told, magic blue sand which does about the same thing as Claudia.
  
  • From that, Claudia (Cloudia?) certainly sounds like the same thing; I expect it doesn't produce the same calibre of ColossalDeathWeaponry as the blue sand does, though.
    
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