Do you mean 'earthen'? Earthen is an adjective (a word used to describe a noun), not a noun (a naming word), so you can't say 'an earthen', you have to say 'an earthen something or other'. Earthen means that it is made out earth, in other words, that it is made from clay.
The dance form that is linked with the earthen lamp is the Garba Raas. This is an Indian dance. The name 'Garba' is a derivative of 'Garbhadip' or 'lamp inside an earthen pot.'
(of a floor or structure) Made of compressed earth: "an earthen dam".(of a pot) Made of baked or fired clay.
Earthen dams have very wide base and suitable to pervious foundation.
clay
An earthen pot has small pores in its walls. When water is poured into it, some of it seeps through these pores to its outer surface. On reaching there, it evaporates.The heat required for evaporation is taken from the earthen pot and from the water in it. As a result, the water in an earthen pot gets cooled down.
Earthen pots have tiny holes in them through which some of the water keeps seeping. But it is not noticeable. The water which is now outside the earthen pot evaporates. Durin evaporation, the water gain heat energy from the surroundings to evaporate. Thus the surroundings and the water in the earthen pot loses heat energy and cools gradually.
earthen lamps
An earthen pot can be any dimension that the creator wishes. They come in sizes from very small to larger architectural statement pieces.
Potter .
Earthen Lamp
An earthen pot to store water is called a "matka" in India. It is commonly used to keep water cool in hot regions.