Question

what do you mean by green sand​

Answer 1

Green sand also called “glauconite” , greensand is a material from the ocean floor that is mined to be used as a soil conditioner or fertilizer. It has a bluish-green color and is made of marine potash, silica, iron oxide, magnesia, lime, phosphoric acid, and about 30 other trace minerals.

The sand is not green in color nor do the molds use “greensand,” a greenish color sandstone. Instead the sand is called “green” because it has moisture in it (like green wood) before the sand dries out when molten metal is poured in the mold.

Green sand is an aggregate of sand, bentonite clay, pulverized coal and water. Its principal use is in making molds for metal casting. ... Green sand (like other casting sands) is usually housed in what foundry workers refer to as "flask", which are nothing other than boxes without a bottom or lid.

Green sand consists of high-quality silica sand, about 10 percent bentonite clay (as the binder), 2 to 5 percent water and about 5 percent sea coal (acarbonaceous mold additive to improve casting finish). The type of metal being cast determines which additives and what gradation of sand is used.
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Answer 2

green sand means a type of sand which has noticible amount of green particles or clay minerals

these types of sand is generally found in under shallow sea or ocean