Sulfur

specimen number:
2072367

location:
San Felipe, Baja California, Mexico

description:
Attractive slightly translucent yellow crystals of sulfur measuring to 0.7 cm in size across the top of matrix. Minimal damage present, overall in good condition.

The San Felipe area, specifically the San Felipe sulfur district in Baja California, Mexico, is situated along the western margin of the Gulf of California. Geologically, the sulfur deposits are of volcanic-fumarolic origin, formed as native sulfur precipitated from hydrogen sulfide gases associated with late Cenozoic geothermal activity and faulting within the Salton Trough. The mineral typically occurs as bright yellow, crystalline masses or fine-grained coatings within porous volcanic tuffs and breccias. Historically, mining and quarrying for sulfur in this region intensified in the mid-20th century, with significant commercial operations occurring between the 1940s and the 1960s to support industrial and agricultural demand. While the most active period of extraction has passed, the district remains a notable geological site for studying sulfur deposition in active tectonic zones. As of 2026, the area is better known for its geothermal potential and as a historical mineral locality, with the rugged coastal landscape still bearing the evidence of these mid-century industrial efforts.

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