Pseudo-fossil (Amethyst Crystal)
Not applicable (Mineral specimen: Quartz var. Amethyst) • Non-biological / Mineral specimen (Crystalline Quartz)
Geological Period
Variable (Crystallization commonly occurs in Proterozoic to Cenozoic host rocks)
Estimated Age
Typically 50 to 500 million years (mineral age, not fossilized biological remains)
Preservation Type
Crystalline growth (not a preservation of biological material)
Condition Assessment
Fair; shows significant mechanical abrasion, lack of defined crystal faces (points), and surface scratching.
Taxonomic Classification
Inorganic; Class: Silicates; Group: Quartz; Variety: Amethyst
Morphological Description
Elongated, sub-hexagonal prismatic crystal structure showing conchoidal fracture patterns; exhibits translucent to transparent purple hue due to irradiation of iron impurities.
Rock Matrix
Matrix-free; typically associated with basaltic geodes, hydrothermal veins, or granitic pegmatites.
Formation & Location
Commonly found in the Rio Grande do Sul region of Brazil, Artigas in Uruguay, or Thunder Bay in Canada.
Size & Dimensions
Approximately 4-6 cm in length; consistent with typical small individual quartz points.
Value & Rarity
Estimated Market Value
$2 - $10 USD
Auction Estimate
$5 - $15 USD (as part of a bulk mineral lot)
Rarity Assessment
Common; amethyst is one of the most widely distributed and commercially available semi-precious minerals.
Scientific Significance
Provides data on hydrothermal fluid temperatures, chemical impurities (Iron), and geological ionizing radiation levels at the time of crystallization.
Preparation Recommendations
Clean with mild detergent and water; avoid prolonged exposure to direct sunlight to prevent fading of the purple pigment.
Notable Features
Distinctive purple zoning; the specimen is a mineral crystal often mistaken by novices for a fossilized tooth or claw due to its tapered shape.