Carl Linnaeus, The Lapland Journey, translated by Peter Graves (Edinburgh: Lockharton Press, 1995), p. 159.
Jokkmokk [2], 25/07/1732, ¶866:
There is said to be no clay in Lappnrark but I found it in 2 places, both in lakes; wherever there was sand on the shores there was mainly clay on the bottom. The places wereRandijaur and Skalkaträsk.