Classification and Physical Characteristics of NWA 16788
NWA 16788 is officially classified as a Martian shergottite, a type of igneous rock ejected from Mars by asteroid impacts and later recovered in Northwest Africa. The meteorite is part of the SNC group, which includes shergottites, nakhlites, and chassignites, and its classification is confirmed through oxygen isotope analysis and trapped gas bubbles matching the Martian atmosphere measured by NASA's Viking landers in the 1970s NASA. The specimen has a fusion crust formed during atmospheric entry and a interior texture of fine-grained pyroxene and plagioclase glass, typical of rapid cooling on the Martian surface.
Mineral Composition and Formation
The rock contains augite, pigeonite, and small amounts of olivine, with shock veins indicating a complex impact history on Mars. Studies published in peer-reviewed journals link this type of meteorite to young volcanic surfaces on Mars, with crystallization ages often estimated between 150 and 600 million years using cosmogenic isotope data ScienceDirect. The NWA 16788 meteorite is not a single stone but a find mass that has been divided into smaller specimens for research and sale.
Market Value and Collectible Status
As a Martian meteorite, NWA 16788 commands a premium price on the collector market, with per-gram values typically higher than common stony meteorites like ordinary chondrites. The value depends on the total known weight, the number of available slices, and the reputation of the dealer or auction house handling the sale, with major meteorite dealers in the United States and Europe listing similar Martian specimens at prices often exceeding several hundred dollars per gram.
Factors Influencing Price
Provenance, documentation, and the presence of a recognized classification from institutions like the Meteoritical Society directly increase the market value of individual pieces. Institutional buyers, including universities and museums, compete with private collectors, which can drive prices up for high-quality slices with visible chondrules or fusion crust Forbes. The trade is regulated in some jurisdictions by cultural property laws and import regulations, which can affect the liquidity of the meteorite market.
Scientific Research and Data Availability
Researchers study NWA 16788 and similar Martian meteorites to understand the geological history of Mars, including volcanic activity, weathering processes, and the possibility of past water interaction. The meteorite provides a terrestrial sample of Martian crust material without the cost and risk of a sample-return mission, making it a critical resource for planetary science Lunar and Planetary Institute. Data from such studies are often shared through databases like the Meteoritical Bulletin Database, which tracks all officially classified meteorites.
Current Research Applications
Geochemists analyze the isotopic ratios of noble gases and trace elements in NWA 16788 to refine models of Mars' interior structure and volcanic evolution. The meteorite's age and composition contribute to broader comparisons with data from Mars rovers and orbiters, helping to contextualize in-situ measurements with laboratory results Nature. Ongoing research continues to publish new findings on the shock history and terrestrial weathering of this and related Martian meteorites.