Druse formed by Manganite, with a geode in which crystals of the Manganite itself stand out, with prismatic habit, parallel growths, very lustrous, dark gray in color and with silvery reflections. The specimen as a whole is accompanied by fine lamellar Calcite crystals, of spheroidal habit, crowning a group of Manganite crystals.
The area of Bridge of Don, a suburb of Aberdeen, is underlain by Devonian Old Red Sandstone sandstones and conglomerates, locally covered by Quaternary glacial deposits. Along the River Don, secondary manganese mineralization, including Manganite, has been reported, related to fractures and alteration zones within the sedimentary sequence.
Bridge of Don (suburb of Aberdeen), Grampian Scotland / United Kingdom
Specimen size: 4.6 × 3.4 × 2.9 cm = 1.81” × 1.34” × 1.14”
Main crystal size: 0.3 × 0.1 cm = 0.12” × 0.04”
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