Lone Tree Mine, Buffalo Mountain Mining District, Humboldt County, Nevada
Miniature - 5.1 x 4.0 x 3.4 cm
54 grams
Specimen status: Reserved
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A patch of black, sparkling
dufrénite microcrystals associated with brown jarosite.
Typical association for the species/locality. And now
for today's mineral chemistry lesson: dufrénite is a
calcium mixed-valence iron phosphate hydroxide - Ca0.5 Fe 2+ Fe 3+ 5 (PO 4 ) 4 (OH) 6 ·2H 2 O
whereas jarosite is a potassium iron sulfate hydroxide -
KFe3+ 3 (SO 4 ) 2 (OH) 6 .
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