Australasian tektite specimen. All are about 1–2" long by ½"–¾" wide. Some have smooth concave surfaces formed by air pockets. Color is nearly opaque black.
The pics are an average representative of our current inventory. You may not receive these exact specimens, but some like them. We try to prioritize the largest specimens to ship first.
You will receive ~one~ tektite specimen
Tektites are formed when large meteors impact the Earth. The material ejected from the impact crater is heated and fused into glass. This tektite is from the Australasian strewnfield, which covers the area within the blue region in the map below and is estimated to have been caused by an impact 790,000 years ago.
All Australasian tektites have a similar chemical composition,which is why they are thought to be from the same impact. The location of the impact crater is still unknown, but recent studies suggest it is most likely in what is now Vietnam.
Image: Meteor Crater
The overwhelming consensus of Earth and planetary scientists is that tektites consist of terrestrial debris that was ejected during the formation of an impact crater. During the extreme conditions created by an hypervelocity meteorite impact, near-surface terrestrial sediments and rocks were either melted, vaporized, or some combination of these, and ejected from an impact crater. After ejection from the impact crater, the material formed millimeter- to centimeter-sized bodies of molten material, which as they re-entered the atmosphere, rapidly cooled to form tektites that fell to Earth to create a layer of distal ejecta hundreds or thousands of kilometers away from the impact site.
The terrestrial source for tektites is supported by well-documented evidence. The chemical and isotopic composition of tektites indicates that they are derived from the melting of silica-rich crustal and sedimentary rocks, which are not found on the Moon. In addition, some tektites contain relict mineral inclusions (quartz, zircon, rutile, chromite, and monazite) that are characteristic of terrestrial sediments and crustal and sedimentary source rocks. Also, three of the four tektite strewnfields have been linked by their age and chemical and isotopic composition to known impact craters. A number of different geochemical studies of tektites from the Australasian strewnfield concluded that these tektites consist of melted Jurassic sediments or sedimentary rocks that were weathered and deposited about 167 My ago. Their geochemistry suggests that the source of Australasian tektites is a single sedimentary formation with a narrow range of stratigraphic ages close to 170 Mya more or less. This effectively refutes multiple impact hypotheses.
Although the formation of and widespread distribution of tektites is widely accepted to require the intense (superheated) melting of near-surface sediments and rocks at the impact site and the following high-velocity ejection of this material from the impact crater, the exact processes involved remain poorly understood. One possible mechanism for the formation of tektites is by the jetting of highly shocked and superheated melt during the initial contact/compression stage of impact crater formation. Alternatively, various mechanisms involving the dispersal of shock-melted material by an expanding vapor plume, which is created by a hypervelocity impact, have been used to explain the formation of tektites. Any mechanism by which tektites are created must explain chemical data that suggest that parent material from which tektites were created came from near-surface rocks and sediments at an impact site. In addition, the scarcity of known strewn fields relative to the number of identified impact craters indicate that very special and rarely met circumstances are required for tektites to be created by a meteorite impact.
This was a really nice specimen of Tektite and came packaged very well! Shipping was super fast too. I have purchased several fossils/rocks/minerals from this shop and all of them have been high quality.