Well, Aklyon... I'll get a little specific...
You need to take this (slade entry)
[INORGANIC:SLADE]
[USE_MATERIAL_TEMPLATE:METAL_TEMPLATE]
[STATE_NAME_ADJ:ALL_SOLID:slade][DISPLAY_COLOR:0:0:1][TILE:154]
[ITEM_SYMBOL:'*']
[DEEP_SURFACE]
[IS_STONE]
[DISPLAY_COLOR:0:0:1]
[SOLID_DENSITY:200000]
[IMPACT_YIELD:4000000]
[IMPACT_FRACTURE:5000000]
[IMPACT_ELASTICITY:100]
[COMPRESSIVE_YIELD:4000000]
[COMPRESSIVE_FRACTURE:5000000]
[COMPRESSIVE_ELASTICITY:100]
[TENSILE_YIELD:4000000]
[TENSILE_FRACTURE:5000000]
[TENSILE_ELASTICITY:100]
[TORSION_YIELD:4000000]
[TORSION_FRACTURE:5000000]
[TORSION_ELASTICITY:100]
[SHEAR_YIELD:4000000]
[SHEAR_FRACTURE:5000000]
[SHEAR_ELASTICITY:100]
[BENDING_YIELD:4000000]
[BENDING_FRACTURE:5000000]
[BENDING_ELASTICITY:100]
And make it into a metal (like adamantine)
[INORGANIC:ADAMANTINE]
[USE_MATERIAL_TEMPLATE:METAL_TEMPLATE]
[STATE_NAME_ADJ:ALL_SOLID:adamantine]
[STATE_NAME_ADJ:LIQUID:molten adamantine]
[STATE_NAME_ADJ:GAS:boiling adamantine]
[DISPLAY_COLOR:3:3:1]
[MATERIAL_VALUE:500]
[SPEC_HEAT:7500]
[MELTING_POINT:25000]
[BOILING_POINT:50000]
[ITEMS_WEAPON][ITEMS_WEAPON_RANGED][ITEMS_AMMO][ITEMS_DIGGER][ITEMS_ARMOR][ITEMS_ANVIL]
[ITEMS_HARD]
[ITEMS_METAL]
[ITEMS_BARRED]
[ITEMS_SCALED]
[ITEMS_SOFT]
[WAFERS]
[SOLID_DENSITY:200]
[LIQUID_DENSITY:2600]
[MOLAR_MASS:55845]
[IMPACT_YIELD:5000000]
[IMPACT_FRACTURE:5000000]
[IMPACT_ELASTICITY:0]
[COMPRESSIVE_YIELD:5000000]
[COMPRESSIVE_FRACTURE:5000000]
[COMPRESSIVE_ELASTICITY:0]
[TENSILE_YIELD:5000000]
[TENSILE_FRACTURE:5000000]
[TENSILE_ELASTICITY:0]
[TORSION_YIELD:5000000]
[TORSION_FRACTURE:5000000]
[TORSION_ELASTICITY:0]
[SHEAR_YIELD:5000000]
[SHEAR_FRACTURE:5000000]
[SHEAR_ELASTICITY:0]
[BENDING_YIELD:5000000]
[BENDING_FRACTURE:5000000]
[BENDING_ELASTICITY:0]
[MAX_EDGE:100000]
[DEEP_SPECIAL]
You have to find out all of which you need to fix/change, to turn it into a metal. I would do it the way adamantine is done mostly. How it has "raw adamantine" which is the stone and the "adamantine wafers" which is the metal. You don't have to make the slade wafers though. If you want, I could try to change the entry around to make it work, but I'm not going to test it.