Alternatively, the structure can be described as an approximately hexagonal close-packed array of oxygen anions, with M two types of octahedral site (M1 and M2). England & Wales License. Your browser does not support the video tag. Olivine in lunar basalt sample 12002. crossed polars As of 2020, Schmitt remains the only professional scientist to have set foot on another solar system body. Plan view of the structure of olivine (click on image to view larger version). These days, NASA and others are using Kilbourne Hole to test equipment and methods which might someday be used on other solar system bodies. You can read them here, here, and here. His 330-page Science Training History of the Apollo Astronauts is available online, and talks about their training at Kilbourne Hole in some detail. This is a barred olivine chondrule from the Cole Creek meteorite, an ordinary chondrite found in Nebraska in 1991. Click here for crossed polars: https://youtu.be/3AjgwewWfsk Magnifi…, Barred olivine chondrule from the Cole Creek meteorite in cross polarized light. This page concerns itself with olivine in general. This is known as complete solid solution. The Lunar and Planetary Institute hosts dozens of documentation photos of 12002 here and 12005 here, including photos of the hand samples from which they were cut. Olivine at mindat.org. Kilbourne Hole served as a training site for Apollo astronauts whose missions included geologic sampling on the moon. Olivine in lunar basalt sample 12005, crossed polars. Xenobombs are pretty great. A plan view of the structure projected along the x-axis is shown below. Olivine in another xenobomb Olivine in plane polarized light. close packing were ideal, the M1 and M2 sites would be regular octahedra, and identical in size, but since the packing is cations occupying half of the octahedral sites, and Si cations occupying one eighth of the tetrahedral sites. b = 1.04 nm, c = 0.61 nm. NASA has brief but full descriptions of 12002 here and 12005 here. Olivine in gabbro, crossed polars As mentioned previously, there is a size mismatch of only about 7% between Mg2+ and Fe2+, He collected Troctolite 76535, the most interesting sample returned from the moon. an excellent overview of the geologic setting and features of Kilbourne Hole. Rotating VR model of the olivine structure: oxygen atoms are shown in red, silicon atoms in blue, M cations occupying M1 sites in yellow, and M cations occupying M2 sites in purple, Creative Commons Attribution-NonCommercial-ShareAlike 2.0 UK: Magnification: 40x Rock: gabbro To view this mineral in crossed polars, click here: https://youtu.be/0AxsEeyMIHU To explore…, Olivine in cross polarized light. Callan Bentley is (rightly) rather taken with xenobombs, and has published three blog posts about them. Olivine has an orthorhombic structure. Space exploration enthusiasts should absolutely scroll to the Bonus Content section at the bottom of this page to learn about NASA using Kilbourne Hole as an Apollo training site and modern equipment testing site. If you need end member-specific information, please see the forsterite and fayalite pages. If you need end member-specific information, please see the forsterite and fayalite pages. Barred olivine chondrule from the Cole Creek meteorite rotating in plane polarized light. One example is olivine , which can vary from Mg 2 SiO 4 (forsterite) to Fe 2 SiO 4 (fayalite). Science Training History of the Apollo Astronauts, the most interesting sample returned from the moon. There’s a picture of Troctolite 76535, at least, and it’s studded with olivine, so the argument can be made that it still belongs on this page. Such a mineral can also consist of any intermediate percentage of either end-member. A typical set of lattice parameters for an unspecified composition are: a = 0.49 nm, Olivine sand from Hawaii Olivine in lunar basalt sample 12005, plane polars William C. Phinney coordinated the Apollo astronauts’ science training. Olivine filling the vesicles in a porphyritic vesicular basalt from Hawaii Olivine is a solid solution series mineral whose two most common end members are forsterite (Mg) and fayalite (Fe). not ideal, the M2 sites are slightly larger and more distorted than the M1. Magnification: 40x Rock: gabbro To view this mineral in plane polars, click here: https://youtu.be/Qpbc1xR3gSc To explore a…. The Footsteps of Apollo Astronauts, another blog post from NASA Earth Observatory, features geologist and Apollo 17 astronaut Jack Schmitt. Olivine in lunar basalt sample 12002, plane polars This page concerns itself with olivine in general. solution where the iron and magnesium atoms can be substituted for each other without significantly changing the crystal This Notes from the Field blog post from NASA Earth Observatory discusses the technologies they’re testing at Kilbourne Hole. The video toward the end is particularly informative. If the hexagonal Olivine in gabbro, plane polars The lunar samples were imaged by, and are used with the permission of, Paul Karabinos. Mg. Fayalite (Fe2SiO4) and forsterite (Mg2SiO4) form a substitutional solid Olivine Olivine is a name for a series of minerals with the formula M2SiO4, where M is most commonly Fe or Mg. Fayalite (Fe2SiO4) and forsterite (Mg2SiO4) form a substitutional solid solution where the iron and magnesium atoms can be substituted for each other without significantly changing the crystal structure. The New Mexico Bureau of Geology and and Mineral Resources has published an excellent overview of the geologic setting and features of Kilbourne Hole. Olivine in a mantle xenolith, or “xenobomb”, from Kilbourne Hole in New Mexico On image to view larger version ) them here, and here detail... Missions included geologic sampling on the moon you need end member-specific information, please see the forsterite fayalite! 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