18.2 x 8.6 x 5.5 cm (largest). A stunning large cabinet pair from a sliced and polished hollow, very elongate colony of coral - you can see the pattern on the outside - that has been replaced or filled inside with botryoidal and banded chalcedony. The lustrous botryoids have a gorgeous variety of color. They look like pearls. This is one of those unusual cases where biology meets mineralogy. This dramatic specimen is from the Hauck Collection.