You can't? Are you sure? Some materials simply can't be golem'd because golems for that material don't exist.
I just tested it. This is completely false. It's not that it's a lump, it's that it's a material you can't golem-ify.
For reference here's a list of golem-able materials:
Valpurium, Spider Silk, acidous blood (these three may need testing, they have their own configs in the Char.dat file), glass, parchment, cloth, mithril, marble, gold, leather, leaf, expensive fabric, palm leaf, sulfur, diamond, silver, sapphire, ruby, bronze, copper, tin, ommel hair, hardened leather, nymph hair, phoenix feather, ice, dragon hide, arcanite, illithium, balsa, pine, fir, birch, oak, teak, ebony, octiron, light crystal, sandstone, limestone, calcite, obsidian, gneiss, slate, granite, basalt, milky quartz, flint, quartzite, amethyst, citrine, roze quartz, jasper, rock crystal, banana peel, plant fiber, bone, ommel bone, ommel tooth, pork, beef, human flesh, iron, steel, meteoric steel, adamant.
That could have been condensed probably, but I'm too lazy to actually do it.
"Put more stuff in the... thing where... more stuff goes in."