Sulfur doesn't have one specific crystal shape. It can exist in various crystal forms, each with a unique structure.

Here are some common crystal forms of sulfur:

* Rhombic Sulfur: The most common form, it has an orthorhombic crystal system with a complex unit cell containing 16 sulfur atoms arranged in a twisted ring structure. It's yellow and brittle.

* Monoclinic Sulfur: This form is unstable at room temperature and converts to rhombic sulfur over time. It has a monoclinic crystal system and a needle-like appearance.

* Plastic Sulfur: This form is rubbery and is produced by rapidly cooling molten sulfur. It's not strictly a crystal but an amorphous form.

* Other forms: Sulfur can also form other allotropes, like cyclic S₈, which has a crown-shaped structure.

Therefore, when talking about sulfur's crystal shape, you need to specify which form you're referring to.