Segnitite has since been found worldwide near similar locality types where rocks are rich in zinc and lead especially.

In fact, forms of beudanite are commonly confused with segnitite, as the sulfate and arsenate anions are readily exchangeable with each other.

In other words, segnitite samples from around the world can be very different from one another making it difficult to provide accurate chemical measurements.

The beudantite-corkite group lies in the middle third on the ternary diagram, possessing intermediate amounts of sulfur.

The lusungite group then has the lowest amount of sulfur, and has end members segnitite and lusungite, which then have varying amounts of arsenic to phosphorus; segnitite is the arsenic rich end member of the lusugnite group.

[2] Through electron microprobe analysis on the basis of 14 oxygen atoms, the empirical formula of segnitite was found to be (Pb1.05Ba0.03)1.08(Fe2.76Zn0.22Al0.17Cu0.01)3.16[(AsO4)1.85(PO4)0.05(SO4)0.04]1.94(OH,H2O)6.24.

Four alternative and simplified versions include: (1) PbFe3(AsO4)2(OH)5·H2O, (2) PbFe3(AsO4)2(OH,H2O)6, (3) PbFe3(AsO4)(AsO3OH)(OH)5, (4) PbFe3H(AsO4)2(OH)6, although the preferred formula is PbFe3H(AsO4)2(OH)6, which is most consistent with the space group (R3m) for Segnitite.

Segnitite has since been found in many localities in Western Europe, specifically in sites near Switzerland, Germany and Austria.

Segnitite is commonly found alongside many well known minerals including anglesite, galena, jamesonite, linarite, arsenopyrite, cerussite, covellite, cuprite, sphalerite, sulfur, beudantite, cassiterite, pyrite, smithsonite, carminite and plumbojarosite.