וַתַּ֖עַל שִׁכְבַ֣ת הַטָּ֑ל וְהִנֵּ֞ה עַל־פְּנֵ֤י הַמִּדְבָּר֙ דַּ֣ק מְחֻסְפָּ֔ס דַּ֥ק כַּכְּפֹ֖ר עַל־הָאָֽרֶץ׃
And when the layer of dew was gone up, behold upon the face of the wilderness a fine, scale-like thing, fine as the hoar-frost on the ground.
Read kabbalistic (mystical) interpretation of Exodus 16:14: and classical mystical sources.