Even low elemental concentrations and minute features in diamond can now be analyzed using instruments with higher sensitivity and resolution.As a result, study combining the inclusion and its diamond host is a powerful tool for geologic research, which itself has improved our understanding of diamond formation. These photos show inclusions of silicate minerals in natural diamond whose background reflectivity has been enhanced by faceting: almandine (left), magnified 10×; pyrope (center), magnified 40×; and diopside (right), magnified 30×. The purpose of this article is to describe our current understanding of where, how, when, and why natural diamonds have been formed.The ratio of normal carbon (carbon-12) to carbon-14 in the air and in all living things at any given time is nearly constant.Maybe one in a trillion carbon atoms are carbon-14.Research into natural diamonds (figure 1) has emerged over the last two decades as one of the keys to understanding the deep earth.Analytical advances, improved geologic knowledge, and the emergence of new diamond-producing regions (such as the Slave craton of Canada) have all contributed to this change.Science, Grade 5: b7(A, B, D), b8 (B, D), b9 (A, D), b10 (A).
It was found that certain fossils, now referred to as index fossils, were restricted to a narrow zone of strata.The most prized specimens for research are flawed with visible inclusions (figure 2), for these carry actual samples of mantle minerals from depths as great as 800 km beneath the surface.Diamond provides the perfect container for mantle minerals, isolating them from the high pressure and temperature reactions within the earth for geologic time scales.Science, Grade 4: (b)(3)(C), (b)(7)(A, B, C), (b)(8)(B, C), (b)(10)(A). Composite Volcano, Paricutin Cinder Cone, Earth—Moon Comparison, Soil Formation, Earthquake, Fault Line, Landslide, Mountains, Hills, and Valleys, Pie Slice of the Sun, Scale Model of the Earth-Moon System, Scale Solar System Model, Trilobites, Delta Deposition, Meandering Stream, Straight Cone Nautiloid, Porous and Impermeable, Primary Porosity-Roundness, Primary Porosity-Sorting, Groundwater Zones, Soil Creep, Formation of Coal, Formation of Petroleum, Water Cycle, Sundial, Ammonoid Evolution - Background Information, Ammonoid - Straight Suture, Ammonoid - Goniatitic Suture, Ammonoid - Ceratitic Suture, Ammonoid - Ammonitic Suture, Ammonoid Suture Pattern Activity These Block Models are corelated to the 2010 TEKS.At left, top to bottom: Pie Slice of the Sun, Sundial, and Give your students a copy of each pattern and let them make their own models. The models and activities in this book cover TEKS § 112.16.