It’s countable. Raspberries

They're countable. I bought some raspberries at the store. I dropped a raspberry on the floor.

Raspberries are countable. I bought some raspberries at the store. I ate some strawberries for breakfast. I put some blueberries on my pancakes. Also, I can say these 3 phrases without the word "some" and it has the same meaning. I bought raspberries at the store. I ate strawberries for breakfast. I put blueberries on my pancakes. Если говорить о баночке с ягодным вареньем, то можно использовать форму слова в единственном числе. "What kind of jam do you have?" "I have strawberry." Good luck!

Of course ‘raspberry’ can be both countable and uncountable. It’s uncountable as a flavor, countable as a piece of fruit. I taste some raspberry in the muffin. There’s no raspberry in the recipe.

berry -- berries 8I