Found large deep red stones that are soft they can be used to draw on rock with. what are they?

or:Found large deep red stones that are soft they can be used to draw on rock with. what are they?or:Clay if you can mold it,sandstone if you cant

or:Found large deep red stones that are soft they can be used to draw on rock with. what are they?

or:Clay if you can mold it,sandstone if you cant

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