_____ is a crystalline allotrope of carbon with 60 carbon atoms having a spherical shape.

Explanation

**Step-by-Step Solution:**

1. **Understanding Allotropes of Carbon**: Allotropes are different forms of the same element in the same physical state. Carbon has several allotropes, including diamond, graphite, and fullerenes.

2. **Identifying the Allotrope**: The question specifies a crystalline allotrope of carbon that has 60 carbon atoms and a spherical shape.

3. **Recognizing the Structure**: The allotrope with 60 carbon atoms arranged in a spherical shape is known as Buckminsterfullerene. It is also commonly referred to as "buckyballs" due to its resemblance to a soccer ball.

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