Quick note on the "Hip 36601 C1A site 5 Polonium" location in Horizons - seems to be not spawning. I collected only a single needle crystal of Polonium. all the rest, c.6, were crystal shards of various G3-4 mats.
I think you may confusing things and went in a GEO site instead of a BIO site
BIO sites will contain only Crystalline Shards and will drop ONLY the advertised G5 material, in the case of Hip 36601 C1A that is only Polonium
Edit: and usually you can fill your stash 0-150 without depleting a Crystalline Shard location (in Horizons)