Red Marcasite in Agate - Design-Ready Set

Bring a striking piece of geological history into your collection with this raw Red Marcasite specimen. Known for its distinct metallic luster and fascinating crystal habits, this specimen features a naturally occurring red-to-brown iron oxide coating (often hematite or limonite) that beautifully contrasts with its pale brass-yellow interior.

Marcasite is an iron sulfide mineral, meaning it shares the same chemical formula as pyrite ($FeS_2$) but crystallizes in a completely different orthorhombic system. This structural difference gives marcasite its signature brittle, tabular crystals and unique geological personality.

Why You'll Love It

Unique Presentation: The natural red oxidation layer gives this specimen an earthy, rustic exterior that peels back to reveal glints of metallic silver and brassy undertones.

Geological Wonder: Perfect for educators, mineral enthusiasts, or anyone fascinated by polymorphism—the phenomenon where two distinct minerals share the exact same chemical makeup but form different crystal shapes.

Statement Display: Its unique color profile and metallic catching ability make it a standout piece for shelves, desks, or crystal grids.

Specimen Details

Mineral Class: Sulfide (Orthorhombic crystal system)

Chemical Composition: Iron Sulfide ($FeS_2$) with natural iron oxide surface layers

Texture: Raw, unpolished crystalline clusters with varied surface geometry

Color: Rusty brick red, deep crimson tones, and metallic brassy gold/silver highlights

Care and Handling

Because marcasite is an iron sulfide, it is sensitive to high humidity and moisture. To preserve the vibrant red coating and the integrity of the metallic crystals underneath, keep your specimen in a dry environment and clean it only with a soft, dry brush. Avoid water exposure.

Note: Each mineral specimen is a completely unique product of nature. Expect natural variations in shape, size, color intensity, and crystal distribution from the piece pictured.