It is usually associated with volcanic rocks such as pumice, however, sulfur sometimes occurs in sedimentary rocks. Sulfur should be kept from direct sunlight and handled as little as possible as even warm hands can cause the crystals to expand and crack. Sources are Mexico, Sicily, and Nevada. It is formed in igneous and metamorphic rocks and is quite common in pegmatite dikes associated with intrusions of granite. There are several different mineral varieties but only clear colorful ones are used as gems.
Sources are Brazil, pakistan, and California.
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