Crystalite or Crystallite: How To spell?

The word Crystalite is misspelled against Crystallite, a noun meaning "A minute mineral form like those common in glassy volcanic rocks and some slags, not having a definite crystalline outline and not referable to any mineral species, but marking the first step in the crystallization process. According to their form crystallites are called trichites, belonites, globulites, etc."