As might be guessed, stibiconite forms in the oxidation zone of antimony sulfides. The two different valences occupy different sites in the structure of the mineral, since the size of the atoms diminsh greatly when reduced in charge. Some of the finest stibiconites, producing wonderful pseudomorphs, occur in a few new antimony mines that have yet to produce any unaltered stibnite clusters. It is hoped that these mines will break through the oxidation layers into some pockets of amazingly stunning stibnite specimens. These stibiconites, although in their own right magnificent, only tease the stibnite collectors as to what once was there.
Color is white or gray but usually tinted brown or yellow.
Luster is earthy. Transparency crystals are opaque. Crystal System is isometric, possibly. Streak is white. Associated Minerals include stibnite , valentinite , and other antimony oxides.