The first tektites was found in 1787 in the Moldau River of Czechoslovakia. The original names was moldavites. Tektites are usually translucent, and occur in a range of colors from green to brown.
crystal structure
Amorphouse
Composition
Mainly silicon dioxide
hardness
5
lustre
Vitreous
Remark
Several ideas have been put forward to explain the mysterious origin of tektites. One theory is that they came to earth from outer space, melting as they passed through the atmosphere and thus forming their characteristic shape and surface texture.
source: Gemstones, Cally Hall 1994
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