According some theories moldavites are of volcanic origin.
- The content of water in moldavite is within several hundredths of per cent. Obsidians contain on average 0.25% of water.
- Moldavites contain lechetelierite – neither volcanic glass (obsidians) nor lava do.
- Volcanic glass doesn’t contain micro-crystals.
- On the cut surface of obsidians we can see commencing crystallization, which is not the case in moldavites.
- The enamel of obsidians is paralelly wrinkled. Moldavites have a fluid structure oriented in several possible ways (see more in inner structure of moldavites)
- Obsidians, unlike moldavites, do not have inner tension.
- The low concentration of potassium, lithium and natrium and higher concentration of nickel and other substances in moldavites does not correspond with the composition of volcanic glasses – obsidians.
- Based on infared specters, refractive index and substance content the melting point of volcanic glasses was defined between 1000 – 1100°C, however, the melting point of tektites was defined within 2500 – 3000°C.
- The speed of moldavite solidification was set on 70°C per second. Obsidians cool at the speed of several degrees per second.