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Iron formations  -- (Precambrian banded iron formations) near Negaunee, Michigan

Iron formations -- (Precambrian banded iron formations) near Negaunee, Michigan

Jarosite, Goethite KFe3+3(SO4)2(OH)6, FeO(OH) Locality: La Estrella mine, Jaroso Ravine, Sierra Almagrera, Cuevas del Almanzora (Cuevas de Vera), Almería, Andalusia, Spain Field of View: 3 mm Beautiful jarosite twins. Petr Fuchs’ Photo

Jarosite, Goethite KFe3+3(SO4)2(OH)6, FeO(OH) Locality: La Estrella mine, Jaroso Ravine, Sierra Almagrera, Cuevas del Almanzora (Cuevas de Vera), Almería, Andalusia, Spain Field of View: 3 mm Beautiful jarosite twins. Petr Fuchs’ Photo

Hessionite Garnets - Jeffrey mine, Québec, Canada

Hessionite Garnets - Jeffrey mine, Québec, Canada

Phyllotungstite, CaFe+++3H(WO4)6•10(H2O), Clara Mine, Rankach valley, Oberwolfach, Wolfach, Black Forest, Baden-Württemberg, Germany. Fov 2 mm. Copyright: © MinTreasure.com

Phyllotungstite, CaFe+++3H(WO4)6•10(H2O), Clara Mine, Rankach valley, Oberwolfach, Wolfach, Black Forest, Baden-Württemberg, Germany. Fov 2 mm. Copyright: © MinTreasure.com

Malachite (curly) on Dolomite from Mockleiten Mine, Tyrol, Austria

Malachite (curly) on Dolomite from Mockleiten Mine, Tyrol, Austria

Tiny crystals of Analcime studding a vermiform clay mineral / Five Mile Quarry, Washington

Tiny crystals of Analcime studding a vermiform clay mineral / Five Mile Quarry, Washington

Mordenite (yellow) on chalcedony (smooth white) with white okenite (not so smooth white), Neer Road Pit, Neer Road, Goble, Oregon // Rudy Tschernich collection and photo

Mordenite (yellow) on chalcedony (smooth white) with white okenite (not so smooth white), Neer Road Pit, Neer Road, Goble, Oregon // Rudy Tschernich collection and photo

Thomsonite Maunganui Bluff, Kaipara, Northland, North Island, New Zealand

Thomsonite Maunganui Bluff, Kaipara, Northland, North Island, New Zealand

Erionite - Phelps Dodge Corporation Well No. 1, Little Ajo Mts, Ajo District, Pima Co., Arizona, USA Size: 0.88 mm

Erionite - Phelps Dodge Corporation Well No. 1, Little Ajo Mts, Ajo District, Pima Co., Arizona, USA Size: 0.88 mm