Spinach jade refers to a color associated with which mineral?

Spinach jade is specifically associated with nephrite, a variety of jade. Nephrite is characterized by its darker, more opaque green hues, which can resemble the color of cooked spinach. This term is often used to describe nephrite that has a rich green color, akin to the green of fresh spinach leaves.

In contrast, jadeite, another type of jade, can exhibit a wider range of colors, including intense greens, but it is not typically referred to as spinach jade. Chrysoprase is a green variety of chalcedony, and while it can have vibrant colors, it is distinct from jade in terms of mineral composition and characteristics. Serpentine, although it can also display green hues, is a different mineral entirely and does not fall under the jade classification. Therefore, the association of spinach jade is correctly aligned with nephrite due to its specific green coloration.