Description
A striking negative impression pseudomorph of botryoidal Goethite after Marcasite, showing beautifully preserved crystal forms with a partially polished finish. The polished areas reveal the specimen’s natural sparkle and metallic lustre, while the unpolished surfaces retain the raw, earthy texture typical of Yorkshire iron oxide minerals. The contrast between polished and natural surfaces gives this piece exceptional character and display appeal.
Goethite pseudomorphs after Marcasite are highly sought after by mineral collectors in Yorkshire, where historic mining districts produced some of the UK’s most iconic iron sulphide replacements. Over centuries of weathering, the original Marcasite oxidised completely into Goethite, yet the crystal shapes remained perfectly preserved — a classic example of pseudomorphism.
Origin
This specimen comes from Yorkshire, UK, a region famous for its historic mining spoil heaps in the Yorkshire Dales National Park, particularly around Swaledale and Wensleydale. These shallow dumps are known for producing distinctive Goethite pseudomorphs after Marcasite, formed through long‑term oxidation of iron sulphides. Collectors prize these pieces for their geological history, rarity, and unique botryoidal textures.
Finish
Partially Polished, Freeform Specimen.
Dimensions
- 11cm x 10cm x 7.5cm at widest points (approximately)
- 0.629kg
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.
