A synthetic fluorophlogopite mica (KMg3AlSi3OioF2), in which the (OH) ions that are normally found in normal micas were completely replaced by fluorine, has been synthesized. This material has essentially the same physical and electrical properties as natural phlogopite mica, except with somewhat lower flexibility. To grow large, usable sheets of mica, it is necessary to obtain preferred crystal orientation, which depends primarily on controlled thermal gradients, batch composition, and rate of cooling. Platinum ciucibles were found to be the best material for holding the batch during the melt. Data on the physical, electrical, thermal, and chemical properties of the synthetic mica are given.