In what form is sulfur not found in nature? what sulfur can be obtained in the form of threads?

Sulfur does not occur in nature in a plastic form, only in a free state, in the form of sulfuric acid salts (sulfates) and in combination with metals (sulfides).
Getting Plastic Sulfur: If molten Sulfur is poured into cold water, an elastic, rubber-like mass is formed and even in the form of threads. But a short time passes, and the mass recrystallizes, again becomes hard and brittle, returns to its previous crystalline state.