Natural Pyrite Cube in Matrix from Spain – Pyritecube on Stone, Cubic Pyrite Crystal, iron Pyrite

Key Features:

• Origin: Navajún, Spain. Genuine Naturally Formed iron Pyrite cubes.
• Color: Metallic gold
• Size: Matrix size: 2-3 cm; Pyrite cube: 1 cm
• Weight: typically 20-30g
• Composition: Iron disulfide (FeS₂). Iron (Fe): 46.6%, Sulfur (S): 53.4%
• Crystal System: Cubic
• Hardness: 6-6.5 on the Mohs scale
• Crystal Form: Natural cubic pyrite crystals with impeccable structure and brilliant metallic sheen.
• Uses: Collection display, educational purposes, unique gifts for kids and adults

Please Note: Chosen at random. Photos are for reference only.

Pyrite Cube Formation and Composition

Pyrite, commonly known as "fool's gold," is composed of iron disulfide (FeS₂). These natural pyrite cubes from Spain are found embedded in a host rock, known as the matrix. They form in sedimentary environments under low-temperature conditions. Pyrite often forms in association with other minerals, including quartz and calcite, but in this case, the sharp cubic form of the pyrite is the standout feature, perfectly accentuated by the matrix.

Why Is It Cubic?

Pyrite is part of the cubic crystal system, meaning its atoms are arranged in a symmetrical, three-dimensional grid. This is what gives pyrite its distinct cube-like shape. The iron and sulfur atoms bond together in a regular, repeating pattern, resulting in pyrite's perfect geometric formations. The sharp, natural cubic appearance of these Spanish specimens is highly prized among mineral collectors for its precision and brilliance.

Are Pyrite cubes naturally formed?

Yes. Pyrite crystallizes in the cubic system, which means its natural crystal habit often results in well-defined, geometric cube shapes. These cubic forms are particularly striking due to their sharp edges and metallic luster. Pyrite forms under various geological conditions, often in sedimentary, metamorphic, or hydrothermal environments, where iron and sulfur combine to create the mineral. The cube-shaped crystals are a natural consequence of pyrite's internal molecular structure and can appear in remarkable, nearly perfect forms in nature.

Uses of the Mineral

Pyrite has been used historically in a variety of practical ways. As a source of sulfur, it has been used in the production of sulfuric acid. While pyrite is not a significant source of iron, its ability to create sparks when struck made it valuable in early firearm mechanisms and fire-starting tools. Today, pyrite’s primary value lies in its appeal as a collector’s mineral, with its metallic luster and distinct geometric forms.

Interesting Facts

• Pyrite gets its name from the Greek word “pyr,” meaning fire, because striking pyrite produces sparks.
• It is often found in coal deposits, where it can cause acid mine drainage due to its sulfur content when exposed to water and oxygen.
• Pyrite has been mistaken for gold throughout history, earning it the nickname "fool’s gold," but unlike gold, it is brittle and will break when struck.
• Some of the finest natural pyrite cubes, like these, are sourced from Navajún, Spain, where the crystals are renowned for their clarity and near-perfect geometry.