10 grams of ground cinnamon is a small amount that measures 0.353 oz (10 g). To visualize this, it is about the size of a cherry tomato when poured into a loose pile.

In kitchen measures
1.35 tablespoons
4.06 tsp · 1.35 tbsp · 0.085 cups
about the size of a cherry tomato
Ground cinnamon typically ranges 0.45–0.6 g/mL depending on how it's packed. A firmly packed scoop weighs more.