Reifschlager Gallery of The Rockwell Museum–pre 2000

Moss Agate, as the name implies, is another Carder treatment of his desire to produce in glass an object of mineral origin. Many different finely ground particles of varied colored glasses were picked up on a piece of crystal, heated, and the rock-like formation then pulled into shape with a hook similar to the famed Larson hook for pulling feathers, whereupon it was coated with another layer of clear crystal and given a final form.

Moss Agate is another production which originated in England while Mr. Carder was associated with Stevens and Williams. Its original introduction in the late 19th century apparently met with seemingly the same reception accorded it in the United States under the Steuben label some forty years later. It was not popular.
abstracted from Eric E. Ericson’s A Guide To Colored Steuben Glass 1903-1933 Book Two, p. 71

Other Examples of Moss Agate