From reading Neonknight’s quote from the Ortofon website, I have a hunch what they are saying is that when you heat Aluminum Oxide to 1600 degrees C, it will form a ceramic-like substance, but being an oxide of aluminum, I am not sure it meets the formal definition of a "ceramic", as summarized in Wiki and elsewhere: "Ceramic material is an inorganic, non-metallic, often crystalline oxide, nitride, or carbide material. Some elements, such as carbon or silicon, may be considered ceramics. Ceramic materials are brittle, hard, strong in compression, and weak in shearing and tension."
So, since the body is an oxide of Aluminum, which is a metal, the body of the Ortofon cartridges does not meet this formal definition. Other sources give essentially the same definition, including the "non-metallic" qualifier.
So, since the body is an oxide of Aluminum, which is a metal, the body of the Ortofon cartridges does not meet this formal definition. Other sources give essentially the same definition, including the "non-metallic" qualifier.