Spinach, kiwi fruit, pineapple, fuchsia and rhubarb all produce microscopic needle-shaped crystals called raphides.
菠菜、奇异果、菠萝、紫红色和大黄都会产生称为针晶的微型针状晶体。
英语百科
Raphide
(重定向自Raphides)
Raphides are needle-shaped crystals of calcium oxalate as the monohydrate or calcium carbonate as aragonite, found in more than 200 families of plants.
Both ends are needle-like, but raphides tend to be blunt at one end and sharp at the other.