What is Meteorite Hamilton and why it matters
Meteorite Hamilton is a named meteorite, typically an ordinary chondrite recovered in witnessed fall conditions, valued by collectors and studied by scientists to understand planetary formation, early solar system processes, and impact history. This profile explains verified classification, composition, recovery timeline, and how to distinguish authentic specimens from misidentified stones.
Classification and composition basics
Ordinary chondrite characteristics
Most stones labeled Meteorite Hamilton fall under the ordinary chondrite group, specifically types H, L, or LL, based on metal content and magnetic response. Key minerals include olivine and pyroxene, with a chondritic texture that preserves early solar system dust and crystals. Nickel-iron metal appears as discrete flakes or rims, diagnostic for meteorites versus terrestrial rocks.
Mineral and element signature
Spectroscopic and laboratory measurements reveal common elements such as iron, nickel, chromium, and cobalt, alongside trace phosphides and sulfides. Olivine fayalite (Fa) and pyroxene compositions are recorded in classification tables to help confirm the meteorite type when comparing laboratory results.
| Attribute | Verified Detail | Source Type |
|---|---|---|
| Official designation | Hamilton (falls/ finds) | Meteoritical Bulletin |
| Primary class | Ordinary chondrite (H/L/LL group) | Laboratory classification |
| Key minerals | Olivine, pyroxene, nickel-iron | Petrographic report |
| Typical texture | Chondrules and matrix | Microscopy |
| Common recovery region | Reported localities linked to Hamilton area | Recovery records |
Documented falls, finds, and recovery timeline
Recovery records and Meteoritical Society entries list dates, locations, and mass recovered for each Hamilton event. Witnessed falls add confidence to authenticity, while find dates often reflect later discovery after weathering. Reported coordinates and mass estimates support proper cataloging and research context.
How fall histories are recorded
When a fireball is observed and fragments are recovered, entries are added to official databases with unique identifiers, mass, and locality details. These records help researchers track fragment distributions and compare mineralogy across samples collected over time.
Physical identification for collectors
Authentic Meteorite Hamilton specimens often show a black to dark gray fusion crust, regmaglypts, and internal magnetic response. Chondrules visible in cut and polished faces, together with a nickel-iron content that triggers a compass, are strong indicators. Terrestrial lookalikes such as some basalts or slag lack these combined traits.
- Fusion crust and flow lines on the surface
- Regmaglypts or thumbprint-like depressions
- Magnetic response from nickel-iron metal
- Chondrules visible in polished sections
- Typical mass range for recovered fragments
Scientific and cultural significance
Ordinary chondrites like Meteorite Hamilton serve as samples of asteroidal material, preserving records of thermal processing, aqueous alteration, and collisions in the early solar system. For collectors, verified documentation and provenance are essential to ensure ethical acquisition, accurate valuation, and contribution to scientific study.
Care, storage, and further verification
Practical handling guidance
Minimize long-term exposure to water and acidic soils to reduce rusting of metal grains; short-term field checks for magnetic response and chondrule integrity are acceptable. Document find location, mass, and photographs to support future classification and comparison with database entries.
Next steps for verification
Consider thin-section petrography, bulk composition analysis, and magnetic susceptibility testing for definitive classification. Cross-reference descriptors with the Meteoritical Bulletin and consult experienced curators or commercial labs when confirming identity or value.
Frequently asked questions
- Is Meteorite Hamilton a specific fall or a regional name?
- What ordinary chondrite group does it belong to?
- How can I verify a suspected specimen is genuine?
- What role do fusion crust and regmaglypts play in identification?
- Where are the primary recovery localities recorded?