I've been fiddling with making underground plants, and am currently working with trying to make a plant who's thread can be smelted into metal. Right now, the plant works. The metal works (tested it by generating a free metal reaction that simply cost one unit of fuel). The thread works and can be worked. However, the thread->metal conversion does not work. Once I get that working, I can hopefully balance the plant and metal value-wise to get something rather valuable, but not overpowered. Maybe then, after that, I'll make an underground plant that can be harvested for fuel on those maps without sedimentary/flux stone and inconveniently deep magma.
Anyways, the plant: Currently it shows up as a white square when harvested, but other than that it works fine. Also, if you replace [THREAD:LOCAL_PLANT_MAT:THREAD] with [THREAD:METAL:THREAD], as I tried to do to make a shortcut of threads that could be melted, the game will crash during worldgen.
[PLANT:COTTON_MITHRIL]
[NAME:mithril cotton][NAME_PLURAL:mithril cotton][ADJ:mithril cotton]
[USE_MATERIAL_TEMPLATE:STRUCTURAL:STRUCTURAL_PLANT_TEMPLATE]
[MATERIAL_VALUE:3]
[BASIC_MAT:LOCAL_PLANT_MAT:STRUCTURAL]
[PICKED_TILE:3][PICKED_COLOR:7:7:0]
[GROWDUR:500][VALUE:4]
[USE_MATERIAL_TEMPLATE:THREAD:THREAD_PLANT_TEMPLATE]
[THREAD:LOCAL_PLANT_MAT:THREAD]
[MATERIAL_VALUE:15]
[USE_MATERIAL_TEMPLATE:SEED:SEED_TEMPLATE]
[MATERIAL_VALUE:2]
[EDIBLE_VERMIN]
[SEED:metal nut:metal nuts:7:0:1:LOCAL_PLANT_MAT:SEED]
[SPRING][SUMMER][AUTUMN][WINTER]
[FREQUENCY:100]
[CLUSTERSIZE:5]
[PREFSTRING:silver threads]
[WET][DRY]
[BIOME:SUBTERRANEAN_WATER]
[UNDERGROUND_DEPTH:1:3]
[SHRUB_TILE:58]
[DEAD_SHRUB_TILE:58]
[SHRUB_COLOR:7:0:0]
[DEAD_SHRUB_COLOR:0:0:1]
Next the reaction (I forgot to put the permissions to run this reaction into the entity folder for the longest time. Felt rather dumb after that.) So far, the option to make this reaction never appears on the smelter.
[REACTION:MITHRIL_WAFERS]
[NAME:make mithril wafers]
[BUILDING:SMELTER:NONE]
[REAGENT:A:15000:THREAD:NONE:PLANT_MAT:COTTON_MITHRIL:THREAD]
[PRODUCT:100:1:BAR:NO_SUBTYPE:METAL:MITHRIL][PRODUCT_DIMENSION:150]
[FUEL]
[SKILL:SMELT]
Finally, the metal itself. I plan to re-edit this now. Currently, it is better than iron or steel in all ways except it melts at gold's temperature. When I get around to remaking this, I plan to have it be rather dull (somewhere between copper and bronze) but have exceptional tensile strength.
[INORGANIC:MITHRIL]
[USE_MATERIAL_TEMPLATE:METAL_TEMPLATE]
[STATE_NAME_ADJ:ALL_SOLID:mithril]
[STATE_NAME_ADJ:LIQUID:molten mithril]
[STATE_NAME_ADJ:GAS:boiling mithril]
[DISPLAY_COLOR:1:2:3]
[MATERIAL_VALUE:35]
[SPEC_HEAT:130]
[MELTING_POINT:11915]
[BOILING_POINT:15141]
[ITEMS_WEAPON][ITEMS_WEAPON_RANGED][ITEMS_AMMO][ITEMS_DIGGER][ITEMS_ARMOR]
[SOLID_DENSITY:200]
[LIQUID_DENSITY:2600]
[MOLAR_MASS:55845]
[IMPACT_YIELD:1200000]
[IMPACT_FRACTURE:1200000]
[IMPACT_ELASTICITY:720]
[COMPRESSIVE_YIELD:1200000]
[COMPRESSIVE_FRACTURE:1200000]
[COMPRESSIVE_ELASTICITY:720] 160
[TENSILE_YIELD:750000]
[TENSILE_FRACTURE:1000000]
[TENSILE_ELASTICITY:750] 200
[TORSION_YIELD:750000]
[TORSION_FRACTURE:1000000]
[TORSION_ELASTICITY:750]
[SHEAR_YIELD:750000]
[SHEAR_FRACTURE:1000000]
[SHEAR_ELASTICITY:750]
[BENDING_YIELD:750000]
[BENDING_FRACTURE:1000000]
[BENDING_ELASTICITY:500]
[MAX_EDGE:30000]
[ITEMS_HARD]
[ITEMS_METAL]
[ITEMS_BARRED]
[ITEMS_SCALED]
[WAFERS]