Italcementi Quarry, Magrè, Schio, Vicenza Province, Veneto, Italy

Fe³⁺O(OH)

Crystal System: orthorhombic
Colour: brownish black, yellow-brown or reddish brown
Lustre: adamantine, silky, metallic, dull
Habitus: prismatic or tabular 
Hardness: 5 - 5½
Fracture:  irregular/uneven
Cleavage: perfect {010}; {100} less perfect.
Density: 4.18 g/cm³ 
Origin and geological occurrence: a weathering product derived from numerous iron-bearing rocks in oxydizing environment. Goethite is also a primary precipitate in hydrothermal, marine, and bog environments upon oxidation of reduced iron-bearing waters. 

www.mindat.org 
Smorf link

Samples:

	4.18 Goethite Mammilary aggregate of fibrous-radiated crystals of goethite. Rio Marina, Elba Island, Tuscany, Italy.  #oxides
	4.27 Goethite Mammillary aggregate of goethite.   #oxides