If we tweak Variscite we can make a good Emerald/Howlite fusion. Especially considering that it has Howlite's actual image.
[img]http://orig14.deviantart.net/dfed/f/2015/023/e/e/emm_gem_fusions_by_crazyspaced_by_deitydeviantwarrior-d8f4sqq.jpg[/img]