The term for a format of an artwork (such as painting vs. sculpture), or its precise materials (such as stone) is

The term you are referring to is called the medium of an artwork. The medium refers to the specific materials or technique used to create a work of art. It can be categorized into various formats such as painting, sculpture, drawing, photography, printmaking, installation, etc.

To determine the medium of an artwork, you can follow these steps:

1. Observe the artwork: Look closely at the piece and take note of its physical components. Consider the texture, colors, materials used, and any other characteristics that are visible.
2. Research the artist: If you know the artist's name, you can conduct research to learn more about their preferred mediums or techniques. This can be done through books, websites, museum databases, or interviews.
3. Seek expert opinions: If you are uncertain, consult experts such as art historians, curators, or professionals in the art field who can provide insights based on their knowledge and expertise.
4. Utilize art databases: Online databases and resources dedicated to art can be useful in identifying the medium of a specific artwork. These platforms often provide detailed information about the artist and their works. Websites like Artsy, ArtNet, or museum websites are good places to start.

By combining visual examination, research, expert opinions, and utilizing various art resources, you can determine the accurate medium of an artwork.