Agate teapot - line in handle

Since last summer I own this little agate carved teapot. I'm not familiair with gemstones in general. I believe this is called 'banded agate'; see the nice strokes. Unfortunately, there seems to be a line in the handle, as pictured. I suppose this is a crack line. Is it? Strangely enough, as far as I can see, this seems the only line. I would think a crack in a handle would feature at least two lines. However, it could have been under pressure, without actually breaking, maybe during the carving process.