It is small, lumpy, white, slightly shaded in grey, and similar to the design of the Lump of Coal, hence the name given to it, but larger (when first opened). It is believed that it is the retextured version of the Lump of Coal.
When put within the Volcano, it will slowly melt (shrink of size) over time until it disappears completely. This feature is similar to the special function of the Lump of Coal, and the Turkey series, except they don't shrink or disappear after given time respectively, but produces a fiery effect. This ability takes fairly long, and can take up to an hour to melt completely.