Druzy Pyrite
Pyrite (Iron Disulfide) · Mineral Specimen / Decorative Stone
Crystal System
Cubic (Isometric); habit is typically cubic, octahedral, or pyritohedral, but here it appears as a fine-grained druzy coating or massive micro-crystalline aggregate.
Mineral Group
Sulfides
Chemical Formula
FeS2
Formation Process
Primarily hydrothermal precipitation in veins or as an authigenic mineral in sedimentary rocks under low-oxygen conditions.
About This Crystal
The specimen exhibits an opaque, metallic luster with a brassy-yellow to greyish-gold hue. The surface is covered in a 'druzy' formation of tiny, individual reflecting crystal faces that create a sparkling effect.
Physical Characteristics
Color: Pale brass-yellow to gunmetal grey. Streak: Greenish-black to brownish-black. Fracture: Conchoidal to uneven. Specific Gravity: 4.9–5.2. Fluorescence: None.
Optical Properties
Opaque; metallic luster. Does not exhibit double refraction or pleochroism due to its isometric nature and opacity.
Hardness & Durability
Origin Region
Worldwide; notable sources include Peru (Huanzala), Spain (Navajún), Italy, and the USA. Commonly found in hydrothermal veins and sedimentary environments.
Hardness & Durability
Mohs Hardness: 6.0–6.5. Brittle tenacity. It is harder than most other sulfides but susceptible to 'pyrite disease' (oxidation) in high humidity.
Care & Maintenance
Keep dry to prevent oxidation; clean with a soft brush and avoid water or ultrasonic cleaners. Store in a low-humidity environment away from delicate minerals.
Rarity & Value
Common mineral; value is generally low for massive forms but increases for aesthetic druzy specimens and well-formed large crystals.
Special Characteristics
Known as 'Fool's Gold' due to its metallic luster and color. Exhibits striking reflective properties from multiple micro-facets in its druzy form.
Lore & History
Historically used by Native Americans for mirrors and as a spark-generator for fire. In lore, it is associated with abundance, protection, and the solar plexus chakra.