Identify the figure of speech used in this sentence
He had a heart of stone.
The figure of speech used in the sentence "He had a heart of stone" is metaphor.
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.

### Instruction:
Identify the figure of speech used in this sentence

### Input:
He had a heart of stone.

### Response:
The figure of speech used in the sentence "He had a heart of stone" is metaphor.
Identify the figure of speech used in this sentence He had a heart of stone.
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