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0 item @ $0.00  

Goethite

#AH51850

Goethite

#AH51850
Availability
Sold
Size
8 x 5 x 2.5 cm - Sm Cabinet 
Formula
FeO(OH) (RRUFF)
Locality
Lower Mesabi Range, Itasca Co., Minnesota, United States

An ore specimen of Goethite with a band or seam of Goethite across the face and glistening crystals, which resemble Manganite, on the other half. 

Goethite forms from weathering of primary iron ores like magnetite and pyrite, which involves oxidizing ferrous iron to ferric (Fe III) iron. It contains roughly 63% iron. It typically occurs in Banded Iron Formations (BIF's) in the iron ranges of Minnesota. The Mesabi Range is one the major iron ranges in upper Minnesota, which has produced amazing specimens of Goethite and many other iron minerals. Iron ore deposits were first discoverd in 1844 in the Marquete Range and later in the Mesabi Range in 1866. Ore was first mined in 1890 in the Mesabi Range.

Goethite

Formula
FeO(OH) 
Crystal System
Orthorhombic 
Crystal Habit
Acicular, Reniform, Radial 
Cleavage
Perfect, Distinct, None 
Luster
Adamantine - Silky 
Color
brown, reddish brown, yellowish brown, brownish yellow, ocher yellow 
Streak
yellowish brown 
Class
Orthorhombic - Dipyramidal 
Fracture
Hackly 
Hardness
5-5.5 

Data courtesy of Webmineral.

Collection
Arnold G Hampson Collection
Mineralpedia
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On Dakota Matrix
Previously Sold Goethite
On Dakota Matrix
Other Available Goethite
WebMineral
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Mindat
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