I found an answer to my question regarding existing eucyptite...

I found an answer to my question regarding existing eucyptite deposits. I now doubt that there are any ASX companies with eucryptite deposits because the document I found, a very useful one but dated 2016, says that eucryptite was formerly an important Lithium ore that was primarily mined in Zimbabwe but now has little economic importance as new deposits are relatively rare.

Now a holder again.

Fly ZNC fly!!

BTW, the document I came across is a Lithium profile from the British Geological Survey. It has the some of the most useful but reasonably high-level information that I have yet seen on lithium mineralogy: https://www2.bgs.ac.uk/mineralsuk/download/mineralProfiles/lithium_profile.pdf. Well worth having a look if you are serious about battery-grade lithium.

You may find it interesting that this lithium profile assigns eucryptite a lithium content of between 2.1 and 5.53 (Li%). Eucryptite is either colourless, brown or white while spodumene is either colourless, white, grey, pink, lilac, yellow or green. The data might be a little dated as it assigns a lower Li% than is now commonly accepted. Still worth a read IMO.