It contains sharp crystals that can cause even more pain to your dog. (snowyswan.com)
When Thomas Loy of ANU examined the surface of the Kilu Cave tools under a microscope, he detected evidence of starch grains and long, sharp crystals known as raphides, which are found in plants such at nettles. (newscientist.com)
When uric acid levels in the body get too high, the acid hardens into sharp crystals that are deposited in joints. (health.com)