any way to style points based on two attributes?

JSL

I've got a set of gravels with diameter and lithology attributes. Is there any way to style them so size depends on diameter and color depends on lithology?

JSL

I figured out a method:

Split the layer into sublayers by lithology

Select all the layers and use Options->Point styles->Classify to classify all the layers by the size attribute

Select each layer individually and change the color scheme for that layer.

The end result will be points that have the same size classification but are colored differently by lithology