Yes, GEOMANCIES is a Scrabble word!

Letter values in Scrabble US: G 2, E 1, O 1, M 3, A 1, N 1, C 3, I 1, E 1, S 1.

Is it a valid word?

GEOMANCIES is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

divination by means of signs connected with the earth (as points taken at random or the arrangement of particles thrown down at random or from the configuration of a region and its relation to another)