Final answer:
The Black Penny was made of Iron and was believed to cure mental disorders in cattle, but there is no scientific evidence to support this belief.
Step-by-step explanation:
The Black Penny was believed to be useful in curing mental disorders in cattle, but it is important to note that this belief is not scientifically supported. The Black Penny was made of Iron. However, it is crucial to rely on veterinary expertise and follow evidence-based practices for the proper treatment of mental disorders in livestock.