Materials
- Sandstone62
- Soapstone (metamorphic rock)58
- Plate glass45
- Slate (rock)40
- Quartz (mineral)39
- Wood (plant material)29
- Flint (rock)27
- Horn (animal material)23
- Conifer root20
- Granite (rock)19
- Metal17
- Mammal bone16
- Petrified wood14
- Charcoal (material)13
- Mussel shell13
- Acetate film (16 mm)12
- Asbestos12
- Ocher (pigment)12
- Redbud bark11
- Basalt (basic igneous rock)9