different between grapholite vs graptolite

English

grapho- +? -lite, from Ancient Greek ??????? (gráphein, “writ?”) and ????? (líthos, “stone”).

grapholite (countable and uncountable, plural grapholites)

From Ancient Greek ??????? (graptós, “painted, marked with letters”) +? -lite.

graptolite (plural graptolites)

Any of a group of extinct aquatic colonial invertebrates, of the class Graptolithina, from the Cambrian and Carboniferous periods.
- 2004, Richard Fortey, The Earth, Folio Society 2011, p. 70:
  The samples were black shale, and on the shales were some ancient fossils called graptolites.

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