Baumhauerite is a lead arsenic sulfide mineral. Sterling Hill material is antimonian with a composition of Pb 50.3, Sb 10.5, As 16.2, S 23.1, total = 100.1 wt. %.
Baumhauerite is a rare mineral from Sterling Hill and is unknown from Franklin.
Baumhauerite occurs as prismatic, acicular, black crystals approximately 1 mm in length. Physical and optical properties were not determined due to the small crystal size. The crystals have a supercell with c = 23.8 A (Dr. Joel Grice, pers. comm.).
Baumhauerite was found on the 900 level at Sterling Hill by John Kolic. Dissolution of the calcite matrix revealed a number of associated minerals including molybdenite-2H, tennantite, arsenopyrite, and seligmannite. Associated gangue minerals are realgar, diopside, barite, fluorapatite and tourmaline. Baumhauerite is commonly associated with molybdenite. (Dunn, 1995)

 Location Found: Ogdensburg
 Year Discovered: 1902
 Formula: Pb12As16S36
 Essential Elements: Arsenic, Lead, Sulfur
 All Elements in Formula: Arsenic, Lead, Sulfur
 IMA Status: Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
 To find out more about this mineral at minDat's website, follow this link   Baumhauerite

Dunn, Pete J. (1995). Franklin and Sterling Hill New Jersey: the world's most magnificent mineral deposits. Franklin, NJ.: The Franklin-Ogdensburg Mineralogical Society. p.553

The Picking Table References
 PT Issue and PageDescription / Comment
View IssueV. 29, No. 2 - Fall 1988, pg. 10Uncommon Sulfosalts From Sterling Hill, Dr. Pete J. Dunn
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