Yes, malachite has a crystal structure. It belongs to the monoclinic crystal system, meaning its crystals have three unequal axes, with two axes intersecting at a right angle and the third axis at an oblique angle.

Here's a breakdown of its structure:

* Chemical formula: Cu₂(CO₃)(OH)₂

* Crystal habit: Often found as radiating clusters of acicular (needle-like) crystals, or as botryoidal (grape-like) masses.

* Crystal structure: Monoclinic, with space group P21/c

* Unit cell dimensions: a = 5.61 Å, b = 11.87 Å, c = 15.96 Å, β = 98.7°

This structure is what gives malachite its characteristic vibrant green color and banded appearance. The layered structure of copper hydroxide and carbonate ions allows for the formation of these distinctive bands.