Use your hoe on the second floor of Moonlight Mine.
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Go to the cave by Jamie's house and take a hammer and a hoe, go to the second lvl and use the hoe on the ground and the gray stuff that pops up is clay. KEEP THE CLAY IN YOUR CABINET, AT LEAST 10!!!!! Sabriaia or whatever his name is will come to your town and you can buy the againg pot.
With clay you can make bricks and clay blocks (blocks identical to the ones you mined to obtain the clay). Brick are made by smelting the clay in a furnace, and clay blocks are crafted like this: E E E C C E C C E E = Empty C = Clay Bricks can then again be made into brick blocks, crafted in the same way as the clay blocks, just replacing the clay with brick.
mud+sand=clay
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.
Clay goes for 177Gp each Soft-Clay goes for 244GP each