In almost any mining area
One place where you can mine clay in Runescape is South of Varrock. It's right by the Champion's Guild, which is South-West of the dark wizards circle. If you look on your map (it's not East of the wizards) you'll find it very easily. There you'll find 2 clay rocks that respawn pretty fast, and if you add water to the clay you'll get soft clay which is used for pottery and such.
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Well a good place to mine clay is between the cities of varrok and lumbrige. When you are in lumbrige ( the place where you first start off) go north and just before you reach the windmill there is a path going north. Follow it, you should be passing a cart on that road. Once u reach the end of the road the mine will be in front of you. When done mining clay you can deposit it in a bank which is north of the mine, just follow the city wall.
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.
Follow these easy steps to craft a clay ring:1. Go to the mine south-west of varrok.2. Mine one clay rock.3. Buy a clay mould at the G.E.4. Use the clay with a bucket of water.5. Use the soft clay with a ring mould.6. Use the ring mould with a furnace.7. Tadaa! A clay ring.
In barbarian village
Clay goes for 177Gp each Soft-Clay goes for 244GP each