mercury is a metal. It is liquid at room temperature.

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it is a metal

It's a transition metal.

Alternative metal

Avant-garde metal/Experimental metal

Black metal

Christian metal

Crust punk

Death metal

---Technical Death metal

---Melodic Death metal

Doom metal

---Funeral doom

---Drone metal

Extreme metal (also describes Death metal, black metal, doom metal, and some thrash metal collectively)

Folk metal

Glam metal

Gothic metal

Grindcore

Groove metal

Industrial metal

Metalcore

---Deathcore

---"Nintendocore"

Neo-classical metal/Shred

Nu metal

Power metal

Post-metal

Progressive metal

---Djent

Rap metal

Speed metal

Stoner metal

Symphonic metal

Thrash metal

Traditional heavy metal

Viking metal

Note that any of these genres can be fused in any way imaginable. In fact, that is how some types came to be, like djent, which is a fusion of progressive metal, metalcore, groove metal, technical death metal, and experimental metal.