Iron Pyrite (Fool's Gold) in Quartz Matrix
Mineral Specimen / Raw Gold Impersonator · Pyrite (Iron Disulfide, FeS2)
Purity: 0% (Non-precious Iron Disulfide)
Type
Mineral Specimen / Raw Gold Impersonator
Purity
0% (Non-precious Iron Disulfide)
Gold Type
Pyrite (Iron Disulfide, FeS2)
Weight
Estimated 50-150 grams for the hand-sized cluster
Description
A striking example of iron pyrite, colloquially known as 'Fool\'s Gold,' embedded within a host rock of quartz and metamorphic matrix. This specimen displays the characteristic cubic crystal structure and metallic luster that historically deceived prospectors. While lacking in precious metal content, it serves as a fascinating geological study of sulfide minerals and leurre (lure) of the gold rushes.
Key Features
Cubic crystal habit, striations on crystal faces, brassy metallic luster, and heavy weight relative to size
Color & Finish
Brassy, metallic yellow with a greenish-black streak and high-luster cubic faces
Hallmarks & Stamps
None; natural mineral specimen lacks man-made markings
Dimensions Estimate
Approx. 40mm x 30m x 25mm based on visual perspective
Gemstones & Inlays
None; quartz/silica matrix surrounds the crystalline pyrite structures
Clasp & Closure
None (unprocessed natural state)
Chain & Links
N/A (natural stony matrix)
Craftsmanship Details
Natural crystalline formation; high-quality geometric growth layers visible in the main crystal cluster
Authentication Indicators
Visual 'Fool\'s Gold' indicators: sharp crystal edges, greenish-black powder when scratched (unlike gold\'s yellow streak), and brittle fracture
Origin & Maker
Natural geological formation; commonly found in Peru, Spain, or USA
Era & Period
Contemporary Geological Sample (Geological Age: Millions of years)
Age Estimate
Millions of years old; recently mined/collected
Cultural Significance
Famous for misleading miners during the California Gold Rush; widely used in jewelry during the Victorian era under the name 'marcasite.'
Condition Notes
Fair to Good; shows typical weathering, fracturing in the matrix, and some oxidized dulling on the metallic faces
Value Estimate
$5.00 - $15.00 (Collectible mineral value only; zero melt value)
Care & Maintenance
Keep dry as humidity can lead to 'pyrite disease' (oxidation); clean only with a soft brush, avoid water and chemicals
Similar Items
Chalcopyrite (Peacock Ore), Arsenopyrite, and Native Gold nuggets (which are softer and lack cubic structure)
Interesting Facts
Pyrite can actually strike sparks against steel, leading to its name derived from the Greek word for 'fire.'