OR: (more often) tektite
Generic name for natural glasses such as moldavite, australite, javanite, indochinite, philippinite, billitonite, javaite, thailandite, queenstownite, and bediasite, all of which take their name from their place of their origin. Moldavite is the only variety of interest to gemology.
NOTE: "A natural glass formed from meteorite impact melting the local rock. Depending on the nature of the latter, the composition of tektites is variable. Hence, many varietal names are given to tektites from different localities." MINDAT.ORG.
ETYM: Du Greek 'têktos' meaning molten.
QUASI-SYN: Darwin glass