Hey Sasha,
I use the same material for a hand drill hearth that I do for a bow drill hearth, only thinner. Specifically, I use woods like Basswood (Tilia americana), Eastern Cottonwood (Populus deltoides), Eastern White Cedar (Thuja occidentalis), Box Elder/Manitoba Maple (Acer negundo), Willow (Salix sp.), Staghorn Sumac (Rhus typhina) and others. Incidentally, in the foregoing list they go from my most favoured to ones, less so.
I think you're in California. There was a guy by the name of Storm and Firestorm that posted on different discussion forums. Unfortunately, he has sinced passed away. A very knowledgable man who did extensive testing of hand drill materials in your area. I'll see if I can find a link.
Doc