EX6F4: It is not a Stibiconite, as these are often labeled. We have analyzed it and we can confirm that it is a Stibnite that is covered with native Sulfur. The crystal is quite large, with perfectly defined edges and faces and it is almost completely covered by the sulfur, which makes it a neat yellow color.
As we normally do in these cases we will send a copy of the analysis.
Xikuangshan Sb deposit, Lengshuijiang, Loudi Prefecture, Hunan Province  China (1999)

Specimen size: 27.7 × 3.7 × 1.7 cm = 10.91” × 1.46” × 0.67”