Mispickle Arsenopyrite Brandy Gill Cumbria Genuine Mineral Specimen with Certificate of Authenticity

Genuine Mispickle (Arsenopyrite) – Brandy Gill, Eden, Cumbria

This Mispickle specimen, also known scientifically as Arsenopyrite, comes from Brandy Gill in the Eden district of Cumbria, England. It is a genuine British mineral specimen carefully selected for its crystal character, metallic lustre and notable locality. The photograph provided shows the exact specimen you will receive. Please refer to the images for full sizing details and accurate scale.

This crystal includes a Certificate of Authenticity lifetime guarantee generic card confirming its genuine origin and mineral identification.

Mineral & Geological Classification – Arsenopyrite (Mispickle)

Arsenopyrite is an iron arsenic sulfide mineral with the chemical formula FeAsS. It belongs to the sulfide mineral group and is the most common arsenic-bearing mineral found in hydrothermal ore deposits.

Mineral Name: Arsenopyrite
Common Historical Name: Mispickle
Chemical Formula: FeAsS
Mineral Group: Sulfide
Crystal System: Monoclinic
Hardness: 5.5–6 on the Mohs scale
Lustre: Metallic
Colour: Steel grey to silver-white

Arsenopyrite typically forms well-defined prismatic or wedge-shaped crystals, often with striated faces. Fresh surfaces display a bright metallic sheen, while weathered areas may develop darker tarnish tones due to oxidation.

Geological Setting – Brandy Gill, Eden, Cumbria

Brandy Gill is part of the mineralised zones of Cumbria, an area known for its complex geology and historic mining activity. The region features mineral veins associated with hydrothermal processes linked to ancient tectonic events and intrusive activity.

Arsenopyrite in this locality formed within hydrothermal veins cutting through host rocks, where mineral-rich fluids deposited iron, arsenic and sulfur under elevated temperatures and pressures. These hydrothermal systems are often associated with quartz veins and may occur alongside minerals such as galena, sphalerite, pyrite and chalcopyrite.

The Eden district has a long mining heritage, and specimens from named Cumbrian localities are sought after by collectors due to their documented provenance and regional geological importance.

Crystal Characteristics & Notable Traits

Arsenopyrite crystals commonly exhibit:

• Sharp prismatic or wedge-shaped crystal forms

• Distinct crystal striations

• Bright metallic silver-grey surfaces

• Subtle iridescent tarnish on exposed areas

The metallic lustre reflects light strongly, giving the specimen a striking appearance in display. The monoclinic crystal structure results in characteristic angular growth patterns that distinguish arsenopyrite from similar-looking sulfide minerals.

Natural surface textures, growth lines and minor oxidation features are part of the mineral’s geological history and confirm authenticity.

Geological Importance & Collectibility

Arsenopyrite is an important ore mineral for arsenic and is also associated with gold-bearing hydrothermal systems in certain geological settings. Its presence can indicate specific temperature and chemical conditions during mineralisation.

Specimens from Brandy Gill, Cumbria, are valued by collectors of British minerals due to the locality’s recognised mining heritage. The historical name “Mispickle” adds further traditional interest for mineral enthusiasts.

This specimen offers both geological relevance and locality significance, making it a desirable addition to mineral cabinets, educational collections or regional displays.

Because this is a genuine natural specimen, each piece displays unique crystal structure and surface character. The photograph shows the exact specimen you will receive.

Authenticity & Presentation

This Mispickle (Arsenopyrite) specimen from Brandy Gill has been carefully chosen for quality, metallic lustre and locality provenance. Included with your purchase is a Certificate of Authenticity lifetime guarantee generic card confirming its genuine origin from Eden, Cumbria.

Combining classic hydrothermal sulfide mineralisation with documented British locality, this Arsenopyrite specimen offers mineral authenticity, geological interest and collector appeal in one carefully selected piece.