"novel aspect" is correct and usable in written English. You can use it to refer to something innovative, new, or unique. Example sentence: This project has a novel aspect that sets it apart from other similar endeavors.
The most novel aspect of her argument concerns the present.
One novel aspect of the report is a specific list of "Reasons for Concern".
What has been advertised as the most important, and novel, aspect of the Marja operation got under way on Saturday.
One novel aspect of the pilot was its scoring system.
A novel aspect of the current model is the inclusion of nosocomial infections.
An additional novel aspect of this study is the choice of the scenarios.
The novel aspect of gStore-D is the adoption of "partial evaluation and assembly" framework.
Being a terminologist, I care about word choice. Ludwig simply helps me pick the best words for any translation. Five stars!
Maria Pia Montoro
Terminologist and Q/A Analyst @ Translation Centre for the Bodies of the European Union