Assertion: sea urchin's spine | /r/HasProperty | brown
Facets:
Source sentences:
text: Although sand dollars are often thought of as white, when they are alive they are covered in spines that may be purple, brown or tan in color.
text: species are generally sub-circular, measuring approximately 2–4 inches across, and are coated with spines that are purple, reddish-purple or brown in color.