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Some nouns like "apple" and "watermelon" are sometimes count nouns, and sometimes non-count nouns, depending on how we're thinking about them, not whether they're solid or broken.

When we're thinking of individual pieces of fruit, "apple" and "watermelon" are count nouns:

I have an apple in my lunch.

We almost ate a whole watermelon.

When we think of them as ingredients or a general substance, they are non-count nouns:

This pie needs more apple.

There's watermelon all over the lawn.

With "mirror", generally speaking, when it's broken, we don't think of it as a mirror anymore because it doesn't reflect images, so it's not a mirror. We think about it as a general substance:

*Our living room mirror broke, and now there's glass all over the carpet."

Mirrors stop being mirrors when they break, and become glass.

Some nouns like "apple" and "watermelon" are sometimes count nouns, and sometimes non-count nouns, depending on how we're thinking about them, not whether they're solid or broken.

When we're thinking of individual pieces of fruit, "apple" and "watermelon" are count nouns:

I have an apple in my lunch.

We almost ate a whole watermelon.

When we think of them as ingredients or a general substance, they are non-count nouns:

This pie needs more apple.

There's watermelon all over the lawn.

With "mirror", generally speaking, when it's broken, we don't think of it as a mirror anymore because it doesn't reflect images, so it's not a mirror. We think about it as a general substance:

"Our living room mirror broke, and now there's glass all over the carpet."

Mirrors stop being mirrors when they break, and become glass.

Some nouns like "apple" and "watermelon" are sometimes count nouns, and sometimes non-count nouns, depending on how we're thinking about them, not whether they're solid or broken.

When we're thinking of individual pieces of fruit, "apple" and "watermelon" are count nouns:

I have an apple in my lunch.

We ate almost a whole watermelon.

When we think of them as ingredients or a general substance, they are non-count nouns:

This pie needs more apple.

There's watermelon all over the lawn.

With "mirror", generally speaking, when it's broken, we don't think of it as a mirror anymore because it doesn't reflect images, so it's not a mirror. We think about it as a general substance:

*Our living room mirror broke, and now there's glass all over the carpet."

Mirrors stop being mirrors when they break, and become glass.

Some nouns like "apple" and "watermelon" are sometimes count nouns, and sometimes non-count nouns, depending on how we're thinking about them, not whether they're solid or broken.

When we're thinking of individual pieces of fruit, "apple" and "watermelon" are count nouns:

I have an apple in my lunch.

We almost ate a whole watermelon.

When we think of them as ingredients or a general substance, they are non-count nouns:

This pie needs more apple.

There's watermelon all over the lawn.

With "mirror", generally speaking, when it's broken, we don't think of it as a mirror anymore because it doesn't reflect images, so it's not a mirror. We think about it as a general substance:

*Our living room mirror broke, and now there's glass all over the carpet."

Mirrors stop being mirrors when they break, and become glass.

Some nouns like "apple" and "watermelon" are sometimes count nouns, and sometimes non-count nouns, depending on how we're thinking about them, not whether they're solid or broken.

When we're thinking of individual pieces of fruit, "apple" and "watermelon" are count nouns:

I have an apple in my lunch.

We almost ate a whole watermelon.

When we think of them as ingredients or a general substance, they are non-count nouns:

This pie needs more apple.

There's watermelon all over the lawn.

With "mirror", generally speaking, when it's broken, we don't think of it as a mirror anymore because it doesn't reflect images, so it's not a mirror. We think about it as a general substance:

*Our living room mirror broke, and now there's glass all over the carpet."

Mirrors stop being mirrors when they break, and become glass.

Some nouns like "apple" and "watermelon" are sometimes count nouns, and sometimes non-count nouns, depending on how we're thinking about them, not whether they're solid or broken.

When we're thinking of individual pieces of fruit, "apple" and "watermelon" are count nouns:

I have an apple in my lunch.

We ate almost a whole watermelon.

When we think of them as ingredients or a general substance, they are non-count nouns:

This pie needs more apple.

There's watermelon all over the lawn.

With "mirror", generally speaking, when it's broken, we don't think of it as a mirror anymore because it doesn't reflect images, so it's not a mirror. We think about it as a general substance:

*Our living room mirror broke, and now there's glass all over the carpet."

Mirrors stop being mirrors when they break, and become glass.