The Levallois technique is also attested on quartzite, schist or lydite cutting devices, regular parallel surface products and faceted heels.
2.
A "'touchstone "'is a small tablet of dark stone such as fieldstone, slate, or lydite, used for assaying precious metal alloys.
3.
The term " basanite " has occasionally been used to refer to a variety of jasper, a black flinty or cherty jasper found in several New England states of the US . Such varieties of jasper are also informally known as " lydian stone " or " lydite " and have been used as touchstones in testing the purity of precious metal alloys.
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