Sodium Selenite also known as a Disodium salt of Selenious Acid is a white solid, highly soluble in water, solubility in water : about 85 gms /100ml @ 20°c., but not soluble in ethanol. It has the Mol. Formula Na2SeO3 with Selenium having (+4 )oxidation state
Sodium Selenite is a white, sand-like solid. It is used to remove green color from glass, as a laboratory chemical and as a medication.
it is not the same material. But given the names, it is fairly common for people to mistake one for the other. While it does appear in crystal form, Sodium Selenite is as inorganic form of the element selenium.