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Sylvite is an unremarkable yellow stone found in large quantities within rock salt.
 In real life
In real life, sylvite is potassium chloride in mineral form, making it a type of potash, and is chiefly used for fertilizer.
KCl, can be used/processed to fertilizer, destroyed by water -- should only be in very dry environments [INORGANIC:SYLVITE] [USE_MATERIAL_TEMPLATE:STONE_TEMPLATE] [STATE_NAME_ADJ:ALL_SOLID:sylvite][DISPLAY_COLOR:6:7:1][TILE:'='] [ENVIRONMENT_SPEC:ROCK_SALT:CLUSTER:100] [IS_STONE] [MELTING_POINT:11397] [BOILING_POINT:12700] [SOLID_DENSITY:1990]