in this case fossilized resin. It is not a mineral. It is relatively soft (2-3 on the Mohs scale) and can be scratched easily. By the same token it polishes easily, as explained above. If dropped on a concrete or ceramic tile floor it may break, chip or shatter. A drop on a wooden or asphalt tile floor should not result in any damage. It is at least partially soluble in many chemicals - alcohols, chloroform, acetone and others. When not worn it should be stored in a soft-lined container or pouch. It should not be exposed for long periods to air or to direct sunlight. It is believed that exposure for long periods to air results in evaporation of some volatile components and results in crazing and cracking of the surface in three years or more. In the laboratory, exposure to strong ultra-violet light for a week reduced a piece of amber to a pile of powder. Application of a silicone-based wax (e.g., Turtle Wax) every 4-6 months restores the shine and helps to reduce evaporation and perhaps oxidation.