There's two places that will best meet your needs
If you are over level 60 mining: The mining Guild.
If Below: Seers village coal mine, keep heading East, over log and your there.
To get soft clay within Runescape you must first mine a clay rock, located in many mines throughout Runescape, once you have some clay you must get a bucket and fill it with water and use it on the clay.
Mine some clay, pour water(bucket) on it, and then use a chisel on the soft clay.
mix clay with water
you take a piece of clay and use it on a bucket of water, voila, soft clay.
if you go to the mining spot on the side of ice mountain you can find clay there. from one blood185 on runescape you can also mine clay in the dwarven mines
You can buy soft clay on ge, and you can buy a key mold.
InstructionsItems Needed: Jug (of water), 40 crafting (optional - Brown Apron for crafting guild), PickaxeMine some Clay.Use the Clay with Jug of Water to get soft clay. ( if you mine the clay with bracelet of clay - enchanted Sapphire Bracelet - you skip this process as you mine the clay.)Use the Soft Clay on the Potters Wheel to make the Pot shape.Fire The Pot at the Firing Oven to finish.
You just use pottery clay. In runescape, you mine clay.
Gold, silver and clay.
Mine clay, use with bucket of water to get soft clay then spin it at crafting guild then fire it in furnace at crafting guild.Note: You need 40 crafting to access guild.
Clay goes for 177Gp each Soft-Clay goes for 244GP each
it is not hard,only when put in oven,so it is soft