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Mineralpedia Details for Brookite

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Brookite

Brookite

Named for Henry James Brook, an English crystallographer and mineralogist. An uncommon but widespread mineral that occurs as an accessory in alpine veins through gneiss and schist, in contact metamorphism zones, hydrothermal veinlets, and commonly as a detrital mineral. Localities for fine crystals of Brookite include in Wales, France, Switzerland, Austria, Norway, Russia, Italy, Brazil, and the United States, among several others. Associated minerals include anatase, rutile, titanite, orthoclase, quartz, hematite, calcite, chlorite, and muscovite.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/brookite.pdf

Formula
TiO2 
Crystal System
Orthorhombic 
Crystal Habit
Tabular, Platy 
Cleavage
Indistinct, None, None 
Luster
Sub Metallic 
Color
brown, light brown, dark brown, dark reddish brown, orange 
Streak
yellowish white 
Class
Orthorhombic - Dipyramidal 
Fracture
Sub Conchoidal 
Hardness
5.5-6 
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Brookite from Kharan dist., Baluchistan, Pakistan

Brookite
            from Kharan dist., Baluchistan, Pakistan

Deep reddish brown, thin platy, perfectly formed crystals to 2cm perched atop a clear Quartz matrix.

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Brookite from Magnet Cove, Hot Spring Co., Arkansas, United States

Brookite
            from Magnet Cove, Hot Spring Co., Arkansas, United States

Rich and excellent specimen from this prolific and famous deposit with orthorhombic octahedral Brookite crystals from 3mm to 10mm

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Brookite from Christy dep., Magnet Cove, Hot Spring Co., Arkansas, United States

Brookite
            from Christy dep., Magnet Cove, Hot Spring Co., Arkansas, United States

Shiny black singles and groups of Brookite crystals to 5mm with Quartz.

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Brookite from Intschi Tobel, Intschi, Reuss Valley, Uri, Switzerland

Brookite
            from Intschi Tobel, Intschi, Reuss Valley, Uri, Switzerland

Sharp, brownish red bladed crystal to 7mm with adularia.

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