Description
A beautiful negative impression pseudomorph of Goethite after Marcasite, featuring preserved crystal outlines and a partially polished surface that highlights the specimen’s natural sparkle and metallic lustre. The polished areas reveal the internal texture and subtle sheen of the iron oxide, while the unpolished surfaces retain the raw, earthy character typical of Yorkshire mineralisation.
This contrast between polished and natural surfaces gives the piece strong display appeal and allows you to appreciate both the geological structure and the natural oxidation process that transformed the original Marcasite into Goethite.
Origin
This specimen originates from Yorkshire, UK, a region known for its historic mining spoil heaps across the Yorkshire Dales National Park. The most notable occurrences of Goethite pseudomorphs after Marcasite are found in the shallow dumps of Swaledale and Wensleydale, where centuries of weathering oxidised iron sulphides such as Marcasite and Pyrite into Goethite while preserving their original crystal architecture.
Collectors value these Yorkshire pseudomorphs for their rarity, geological history, and the way they capture the oxidation process in remarkable detail — especially negative impressions like this one, which preserve the external crystal form rather than the internal structure.
Finish
Partially Polished Freeform Specimen.
Dimensions
- 7.5cm x 5cm x 3cm at widest points (approximately)
- 0.148kg
Important Information
The item pictured is the exact item you will receive. Please pay attention to the actual size given in the listing as the pictures are generally enlarged to show details. Colour may be a little different due to the colour calibration of each individual monitor or light levels.
