Material forming the cone is reported to be ‘calcareous’ - perhaps limestone like - not volcanic. Of additional note is the very spherical ‘dome’ in the center of the crater - again most unusual for either an impact crater or a volcano. However, vegitation is growing on the sides of the crater, contrary to the report.
Yeah, I saw vegetation taking root in some areas of the slope. The thing doesn’t look to be that old to me. In a hundred years are so, trees could take root.