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List of Hardware Components is missing oscillator
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iCEstick.md's list of Hardware Components is missing the oscillator.
Page 2 of Lattice's document "iCEstick Evaluation Kit User's Guide" mentions:
Discera 12Mhz MEMS oscillator
This shows up as X1 in the schematic in Appendix A. Its output pin 3 is fed to both the FTDI chip's pin 2 as well as the iCE40HX1K-TQ144's pin 21.
Discera looks to now be part of Microchip. No exact part number is given, but it is perhaps one of these:
https://www.digikey.com/short/002nnwhz