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Powder sulphur

Flowers Of Sulphur (FOS) is also known as yellow sulphur (sulfur) powder, is a bright yellow powder obtained from naturally-occurring volcanic brimstone deposits.
FOS is a natural mineral that has been used as a remedy for centuries. In ancient texts such as the bible it is called brimstone, and 2,000 years ago it was used as a remedy for skin disorders and other ailments.
You can buy flowers of sulphur at pet shops and animal stock feed stores. Farmers, those with animal stock, and pet breeders have used it for many decades, but the pharmaceutical and medical industries prefer that people do not know about it. It is too cheap and too effective.
When you look at Flowers of Sulphur under a microscope the crystals resemble flowers, hence the name.

SULPHUR LUMPS

Pure Sulfur is bright yellow. The color may be altered if impurities are present. Clay and selenium impurities, as well as volcanic mixtures in sulfur can cause it to be slightly red, green, brown, or gray. Sulfur often occurs in petroleum deposits, where it is found coated with greasy black petroleum. Sulfur crystallizes in the orthorhombic system, but an uncommon monoclinic form of sulfur also exists. This monoclinic form is scientifically considered a different mineral than Sulfur, and is scientific name is Rosickyite. Most dealers selling Rosickyite usually label the mineral as "Monoclinic Sulfur". Sulfur is soft, light in weight, and very brittle. Therefore, care must be exercised when handling and storing specimens. When kept moist or not allowed to dry when wet, hydrogen will mix with the Sulfur, forming hydrogen sulfide (H2S), which causes the deterioration of a specimen. To prevent this, Sulfur should not be stored under humid conditions. (See Storing minerals for more information). It is best not to wash Sulfur specimens, as warm water will dissolve it. Sulfur also the tendency to crack when exposed to even mild heat, including body heat. It must be handled as little as possible, and kept out of light to avoid it from cracking.