sxiv is described as 'image viewer' and is an app in the Photos & Graphics category. There are three alternatives to sxiv for Linux and Linux Mint. The best alternative is Eye of GNOME, which is both free and Open Source. Other great apps like sxiv are feh (Free, Open Source) and xviewer (Free, Open Source).
Eye of GNOME is the official image viewer for the GNOME Desktop environment. With it, you can view single image files, as well as large image collections. The Eye of GNOME supports a variety of image file formats.
feh is an X11 image viewer aimed mostly at console users. Unlike most other viewers, it does not have a fancy GUI, but simply displays images. It is controlled via commandline arguments and configurable key/mouse actions.