from a net log:

Tier 1: Bronze, Flax, Cedar, Adobe, Sandstone, Garnet, Malachite, Turquoise, Dim Essence
Tier 2: Silver, Iron, Wool, Elm, Earthenware, Slate, Rose Quartz, Amethyst, Lapis Lazuli, Pale Essence
Tier 3: Steel, Gold, Cotton, Oak, Terra Cotta, Granite, Citrine, Jasper, Aquamarine, Glowing Essence
Tier 4: Cobalt, Platinum, Silk, Maple, Stoneware, Obsidian, Topaz, Opal, Jade, Bright Essence
Tier 5: Mithril, Ironsilk, Yew, Geostone, Marble, Emerald, Fire Opal, Peridot, Shining Essence
Tier 6: Adamantium, Steelsilk, Thornwood, Porcelain, Travertine, Diamond, Ruby, Sapphire, Radiant Essence

seems to be missing azulytes ... too tired to see if everything is covered above. :P