Chalderan

From TARDIS Index File, the free Doctor Who reference.

Chalderans
Appearance / Type:	silicon-based lifeform
Also known as:
Affiliated with:
Place of origin:
Appearances:	DWAM: Under the Volcano
Mentioned in:
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Chalderans were a silicon-based species possessing flame-red skin, horns, and extremely high body temperatures. They had three weaknesses: extreme heat, water and stupidity. They mined planets for lava, emptying the core and leaving them totally dead.

A Chalderan expedition came to Earth in 1883 to mine Krakatoa, angering the natives, who saw them as defiling the mountain. The Doctor and Rose Tyler discovered the Chalderans' base and were captured by them. After tricking the aliens into arguing amongst themselves, the Doctor and Rose and escaped. The pursing Chalderans were killed after running into a waterfall, and the rest perished in the island's explosion. (DWAM: Under the Volcano)