tufa Definition

lithoid, metamorphic rock, limestone, stalactite, sandstone, igneous rock, volcanic rock, basalt, travertine, massifs, hummocks, sphagnum, tumulus, ferny, umbels, creeping thyme, eskers, ashlar, outwash, calcite, clayey, rills, rockwork, chrysocolla, madrona, dolmen, saxifrage, fossae, cumulus cloud, lysimachia, stratovolcano, loess, verdigris, jasper, anorthosite, cirques, hogback, acanthus, freestone, cragged, bristlecone, limber pine, hornblende, coquina, chalcedony, garrigue, cinnabar, red osier dogwood, syrtis major, dolomites, yellow ocher, goethite, vein quartz, eclogite, origanum, lobata, rockeries, landform, mossy, paeonia, nivalis, dawn redwood, holly fern, crenellations, motte, halite, conodonts, stalagmites, plateaux, claystone, concretions, escarpments, azurite, hoarfrost, huaca, lapilli, microfossil, thimbleberry, bryozoan, pennisetum, mt etna, aucuba, douglas fir, caryatids, lignum vitae, smoky quartz, palisades, cork oak, slickrock, stromatolite, vinca minor, prunus, potsherds, swamp milkweed, stinkhorn, boletes, horsetail, moss, cinquefoil, macrocarpa,