It depends on what type of stone veneer you are using! There are many different types of mortars and grouts that can be used for stone veneers, so it's best to consult with a professional to find the right one for your project.

There is no definitive answer to this question as it can vary based on the type of stone veneer and the substrate (e.g., masonry, concrete, metal, etc.) on which it is being installed. That said, some typical mortar options include Portland cement-based mortars, lime-based mortars, or epoxy-based mortars. Your best bet is to consult with a qualified masonry contractor or stonemason to find the right mortar for your specific application.