This is from 1925, old for sure but I know you like digging through old data!
https://pubs.geoscienceworld.org/segweb/economicgeology/article-abstract/20/7/646/14707/Geology-of-the-Etta-spodumene-mine-Black-Hills?redirectedFrom=PDF
Can be accessed here
https://sci-hub.se/https://doi.org/10.2113/gsecongeo.20.7.646
"The huge crystals of spodumene in the Etta are so large, even for pegmatites, that some abnormal conditions must have prevailed at the time of formation..."
It appears reading that article from 1925, the formation of the large spodumene crystals in the Black Hills region can be attributed to the specific geological and mineralogical conditions of the area, including the presence of the Harney Peak granite and the pegmatites intruded into the pre-Cambrian metamorphic rocks, as well as the intense alteration of the schist at the contact point with the pegmatite.
Not much help, but may assist your research @anatol
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