Moldavite is formed from melted rock resulting from a meteorite strike. The surface of these small specimens can be rippled (roiled), wavy, pitted and generally not smooth. Not usually seen in jewelry, but its popularity is on the rise.

Moldavite from Besednice, Bohemia

Gemological information for Moldavite
Color	The color of moldavite varies from green to brownish green to black
Crystal Structure	Amorphous
Refractive Index	1.48 - 1.50
Durability	Moderately good
Hardness	5.5
Similar stones	Glass
Treatments	None
Country of origin	Found in many locations, the location is usually part of the name i.e. Georgiaite, Australite
Ultrasonic cleaning	Probably safe
Steam cleaning	Not safe
Warm soapy water	Probably safe
Chemical attack	Reacts to hydrofluoric acid
Light sensitivity	None
Heat sensitivity	Rapid temperature changes can cause breakage