Clays with mica have a glittery, metallic appearance. Several brands carry mica clays in a variety of colors.
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The most popular colors of mica-infused clay are gold, silver, and pearl, but there are other pearlized colors available, depending on the brand. It is also possible to mix a bit of another clay into a mica-infused clay to create a custom color. (However, the more color you add, the less the proportion of mica, so don't overdo it.)
Mica clays can be used in the same ways as regular clays, but one popular technique unique to this specialty clay is called "mica shift". You can read about mica shift elsewhere on this site.
Not all mica clays are created equal. Each clayer has his or her own personal favorite, but most agree that Kato Polyclay (mixed with up to a 1:1 ratio of translucent clay) and Premo are best for mica shift.
Mica-infused clays are sold in the same size units as regular clays and are cured at the same approximate temperatures.