Tiny real geodes, Mexico. 1:12 or 1:24. Sold individually

Tiny real geodes!  Sometimes called baby geodes, these come from Mexico.  All are mounted so that they are ready to display as shown.  These specimens can work in 1:12 or 1:24 scales.  I've shown them on a 1:24 table. 

Left: 3/8 inch (0.95 cm) wide, 5/16 inch (0.8 cm) tall.

Centre: 7/16 inch (1.1 cm) wide, just over 3/16 inch (0.5 cm) tall.

Right: 3/8 inch (0.95 cm) wide, 5/16 inch (0.8 cm) tall.