Formula: (Fe3+2Ti)O5 multiple oxide, member of the armacolite-pseudobrookite series
Specific gravity: 4.39
Streak: Reddish brown to ochre yellow
Colour: Black, dark reddish brown
Solubility: Soluble in hot hydrochloric and sulphuric acid
Volcanic igneous environments
Pseudobrookite is usually formed from hot vapours in volcanic rocks, associated with
apatite and rutile.
At Riveau Grande, Puy de Dome, pseudobrookite occurs in cavities in andesite with tridymite, hypersthene and sanidine.
On the Island of Reunion in the Indian Ocean it is a product of hot volcanic gases acting on basalt.
At Hessen-Brucker, Hessen, it is a product of hot volcanic gases acting on basalt.
Pseudobrookite occurs on lava from the 1872 eruption of Vesuvius with hematite, magnetite and sellaite.
In Uroiu, Transylvania, pseudobrookite occurs in cavities in andesite with tridymite, hypersthene and garnet.
At Red Cone, Crater Lake, Oregon, pseudobrookite occurs in cavities in basalt with hypersthene and apatite.
In the Thomas Range, Utah, pseudobrookite is occurs in cavities in rhyolite associated with topaz, bixbyite, hematite, red beryl and ilmenite.
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