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Mineralpedia Details for Schwartzembergite

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Schwartzembergite

Schwartzembergite

Named after a man called Dr. Schwartemberg, who was most likely Dr. Adolf Emilio Schwartemberg, a Chilean assayer who first noticed the mineral. Found a just a few localities, Schwartembergite is a rare mineral that occurs in secondary oxidized zone of arid-climate metallic hydrothermal deposits. If Schwarzembergite comes in contact with hydrochloric acid, it will evolve chlorine gas. Schwazembergite is additionally unusual in that in contains iodine.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/schwartzembergite.pdf

Formula
Pb2+5H2I3+O6Cl3 
Crystal System
Tetragonal 
Crystal Habit
Druse, Crystalline - Fine 
Cleavage
Distinct, None, None 
Luster
Adamantine 
Color
yellow brown, light yellow, reddish brown 
Streak
light yellow 
Class
Tetragonal - Ditetragonal Dipyramidal 
Hardness
2.5 
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Schwartzembergite from San Francisco mine, Sierra Gorda dist., Antofagasta, Chile

Schwartzembergite
            from San Francisco mine, Sierra Gorda dist., Antofagasta, Chile

Tabular orange crystals, visibly much like Wulfenite, but tested out to be Schwartzemberite, an iodate of lead. It is also much rarer than Wulfenite and found in only two countries: Chile and Mexico. These crystals are excellent and measure about 1mm. There are several crystals is a 6mm vug. 

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Schwartzembergite from Unión Minera mine, Caracoles, Sierra Gorda dist., Antofagasta, Chile

Schwartzembergite
            from Unión Minera mine, Caracoles, Sierra Gorda dist., Antofagasta, Chile

Tiny 1mm fine micro crystals of this rare lead iodate sometimes confused with Wulfenite.

Click thumbnail images for larger view.

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