Large Pyrite Cube in Matrix | Spain

These pyrite cubes may appear to be man-made at first, but they are in fact completely natural! Originating from the "Ampliación a Victoria" mine near Navajún, Spain, these cubes are renowned for their stunning shine, near-perfect cubic formation, and sculptural appearance. A must-have for any mineral collector!

Cube size approx 15mm x 15mm

Matrix approx 2" x 1"

Iron pyrite - commonly called “fool’s gold” - is a shiny, metallic mineral made of iron and sulfur (FeS₂). It earned its nickname because its bright, brassy-yellow color can easily trick people into thinking it’s real gold.

What it looks like

Pyrite is famous for its mirror-like metallic luster and pale gold color. Unlike real gold, which looks softer and richer in tone, pyrite often appears slightly more silvery or brassy. One of its coolest traits is how it forms: perfect geometric shapes, especially cubes with fine parallel lines (striations) on their faces. You’ll also see it in clusters, nodules, or radiating “sun” formations.

Key physical properties

• Hardness: 6–6.5 on the Mohs scale (much harder than gold)

• Streak: Greenish-black to brownish-black

• Luster: Metallic and reflective

• Crystal system: Isometric (that’s why you get those cubes)

• Brittleness: Breaks or shatters rather than bends