Global rules: All metals are separated in groups of 4. Each metal has a pair (Base/Alloy). Each pair can be separated into Internal/External. Each indivisual metal inside a pair can be separated into Pulling (Base) or Pushing (Alloy)
 
Physical
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External
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Iron: Allows you to "pull" metals towards yourself, like a magnet. However, if you try to pull on things heavier tan yourself, you're the one who's going to get pulled. Pulling in small objects can be hella dangerous, as those basically become bullets.
 
Steel: Opposite to Iron, allows to "push" on nearby metals, always away from yourself. Push small things to make them bullets, push strong things to fly. Careful with crushing yourself, though.
 
Internal
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Tin: Enchances senses to superhuman limits. You have no control over them, however, and a loud noise, a bright light or a strong smell can harm you.
 
Pewter: Strenghtens the body and all body functions, from balance to metabolism. Dampens senses, however, like pain sensibility, which can be dangerous since Thugs have the bad habit of shrugging deadly wounds as nothing and end up dying without realizing it.
 
Mental
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External
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Zinc: Allows to "pull" on emotions, "encouraging" them to fluorish. Only works on already existing emotions, so you can't just make someone feel happy if they're depressed. You could, however, encourage the feeling of wanting to get better.
 
Brass: Same than with Zinc, but the other way around. You could "Sooth" the excitement of a hyperactive kid to make him less annoying, or the bad humor of a friend to make him more amiable.
 
Internal
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Copper: Creates a cloud around the allomancer that hides from the allomantic senses of Bronze. Also prevents emotional allomancy to work on the user.
 
Bronze: Sense nearby allomantic users via "pulses". Each metal has a distinct pulse.
 
Temporal
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External
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Cadmium: Creates a bubble of "Slowed" time. Time outside the bubble passes at blurring speeds. Commonly, inside a Slowbubble time passes 1/8 times as fast as normal time. It is not possible to throw things outside the bubble accurately, as the resistance of change of time throws them off-course.
 
Bendalloy: Creates a bubble of "Sped-up" time. Time outside the bubble passes at glacial speeds. Commonly, inside a speedbubble, time passes 8 times as fast as normal time. You can't throw things accurately outside the bubble, as the resistance of change of time throws them off-course.
 
Internal
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Gold: Allows you to see into past versions of yourself who made different choices. During burning, you "become" those versions, thinking their thoughts and feeling their feelings. It's a rather unpleasant experience for most.
 
Electrum: Allows to see "shadows" of yourself a few moments into the future, with all choices you may or may not make. Those shadows are constantly moving as you analyze what you see and change your course of action, infinetly.
 
Enhancement
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External
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Chromium: Wipes out all allomantic reserves of an allomancer you touch. Burns up instantly.
 
Nicrosil: Strenghtens the next metal burned of an allomancer you touch. burns up instantly.
 
Internal
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Aluminum: Wipes out all allomantic reserves, no additional effects. Burns up instantly.
 
Duralumin: Strenghtens the next metal burned, making it burn into a single burst of power. The bigger the reserve, the stronger the burst. Burns up instantly.