No, it is more of a ceramic I think.....I did find a little background info on it :In the late fifties and early sixties Hull followed the trends in casual living coming from California and developed the House and Garden series. This was a ovenproof heavy ware with thick lines expected to withstand years of abuse both inside the kitchen and outside at the barbecue. The first in this series was the Mirror Brown series and other smaller series were developed from this pattern including the Rainbow series with colors Tangerine, Green agate and butterscotch. This grouping became known as the Rainbow series. Next came Crestone in the House and Garden series. This series continued until 1967 when it was discontinued leaving only the Mirror Brown as the sole survivor of the House and Garden Series. During the 70s and 80s the Hull company stayed afloat by depending on their floral (Imperial) and House and Garden products. The House and Garden was again expanded to include two new colors of gray and tan with some new designed pieces and the bringing back of the pigs and the gingerbread man, the hen on a nest, new designed gravy bowls, lazy susans' and others. The company final shut down in 1985. Hull dinnerware was as common as American Apple Pie until the mid 1980's. Now it has become very difficult to find.