How can I make replica meteorites for class activities?
Mix plaster or clay with small beads for chondrules and iron filings or steel shot for metal, shape them, and paint the outside black to model fusion crust.
Replica meteorites let every pupil handle a 'specimen' and allow tests such as magnetism and density without risk to real meteorites.
Materials. Plaster of Paris or air-drying clay, small beads, dried lentils or couscous for chondrules, and either iron filings, steel shot or small steel washers for metal. Black and brown paint, gloves and eye protection.
Method. 1. In a disposable container, mix plaster with water as directed, wearing gloves. For clay, knead it. 2. Add beads for chondrules. 3. For a magnetic, dense replica, add steel shot or washers. Iron filings can also be used, but handle them carefully, because they are messy and can irritate eyes, and keep them contained in the mixture. 4. Shape into rounded lumps and press thumbprint dents into the surface to model regmaglypts. 5. Allow to dry fully. 6. Paint the outside black for fusion crust, leaving one face unpainted or sanding a 'window' to show the inside.
Variations. Make 'iron meteorites' from heavy, smooth lumps containing more steel, and 'carbonaceous chondrites' from dark grey clay with white specks for CAIs.
Uses. Use replicas in identification tests, density measurements, strewn field hunts outdoors and sorting activities.
Safety. Plaster heats up as it sets; do not encase hands or body parts in it. Wear gloves and eye protection. Do not pour plaster waste down sinks.
Label replicas clearly to avoid confusion with real specimens.
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