Pseudobrookite

Emmelberg, Üdersdorf, Daun, Eifel, Rhineland-Palatinate, Germany © Chinellato Matteo

Formula: Fe2TiO5
Environment:  Magmatic, post-volcanic or young volcanic rocks.
Locality: Vesuvius and Etna, Italy.
Name Origin: From the Greek pseudo – “I mislead” and the mineral brookite.

History

Authors (inventeurs) : KOCH
Discovery date: 1878
Town of Origin : DEALUL UROIU (ARANYI-HEGY), COMTE DE HUNEDOARA, TRANSYLVANIE
Country of Origin : ROUMANIE

Optical properties

Optical and misc. Properties :  Translucide  –   Opaque
Refractive Index: from 2,38 to 2,42
Axial angle 2V : 50°

Physical properties

Hardness : 6,00
Density : 4,39
Color : black; brownish black; reddish brown; yellow
Luster : adamantine; metallic
Streak : reddish brown; yellowish brown; yellow brown
Break : sub-conchoidal; irregular
Cleavage : yes

Photo:

A long thin Pseudobrookite (2 mm) glued together with Topaz crystals – Locality: Wannenköpfe, Ochtendung, Eifel region, Germany © Fred Kruijen.
Pseudobrookite Locality: Topaz Mountain, Thomas Range, Juab County, Utah, USA Size: 2.7 x 2.0 x 1.6 cm. © Rob Lavinsky / iRocks
A nice Pseudobrookite “brush”, 0.9mm long. – Locality: Wannenköpfe, Ochtendung, Eifel region, Germany © Fred Kruijen

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