Assertion: sea urchin's spine | /r/HasProperty | purple
Facets:
value: in color
type: OTHER
value: usually
type: DEGREE
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.
text: The test is densely clothed in long and sharply pointed spines that are usually purple but are occasionally other colours including dark brown, light brown and olive green.