A peculiar occurrence of Magnetite in Upper Bunter Sands

John B. Scrivenor
1903 Mineralogical Magazine and Journal of the Mineralogical Society  
The specimen of Upper Bunter Sands, in which this magnetite occurs, was collected at Hinksford (Staffordshire), near Stourbridge. It is a white, very loosely coherent sand of medium grain ; and contains, as was found by separating the constituents in mercury-potassium iodide, turbid orthoclase, microcline, fragments of the micro-crystalline ground-mass of acid lavas or intrusive rocks, quartz, staurolite, tourmaline, garnet, zircon, rutile, muscovite, a little haematite, and abundant magnetite.
more » ... abundant magnetite. The grains of magnetite are very minute, averaging 0.067 mm., but nevertheless they present, with very few exceptions, a perfect crystal outline, that of a simple cube, or, in a few rare cases, that of a regular octahedron.
doi:10.1180/minmag.1903.013.62.11 fatcat:odb7n22zozcfxepvramwmljmpe