Rocks natural

Schidlowski, M. (1988). A 3 800 million year isotopic record of life from carbon in sedimentary rocks. Nature 333,313-318. 

Determining multiple length scales in rocks), Nature 406, July 13, 178-181. 

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Sobolev, N.V. Shatsky, V.S. 1990. Diamond inclusions in garnets from metamorphic rocks. Nature, 343, 742-746. 

The above discussion has not covered all hardness test methods. However, the development of principal test methods for this parameter has been surveyed accurately as far as possible, chiefly with respect to minerals, in order to demonstrate both the difficulty of selecting a suitable method for testing a particular material (mineral or rock, natural or artificial), and the difficulty of interpretating the results given the wide variety of published test results. These contain errors arising from lack of knowledge of the precise type of measurement, for a material with stated strength properties. 

A. Thorpe, and F. E. Senjtie Comparison of the chemical composition and magnetic properties of tektites and glasses formed by fusion of terrestrial rocks. Nature [London] 187, 1089—1092 (1960). 

See Rosing, M.T., 1999, 13C-depleted carbon microparticles in >3700-Ma sea-floor sedimentary rocks from West Greenland, Science 283 674-676 Shen, Y., Buick, R., and Canfield, D.E., 2001, Isotopic evidence for microbial sulphate reduction in the early Archaean era, Nature 410 77-81 and Shidlowski, M.A., 1988, A 3800-million-year isotopic record of life from carbon in sedimentary rocks, Nature 333 313-318. 

The primary raw materials for nitrogen fertilizers are natural gas, naphtha, fuel oil, and coal. The manufacturing of phosphate fertilizers most often requires phosphate rock. Naturally occurring potassium salts form the basis of the production of most potash fertilizers. 

Kurz M. D. (1986) Cosmogenic helium in a terrestrial igneous rock. Nature 320, 435 -439. 

Leythaeuser, D., Schaefer, R.G. and Yukler, A., 1980. Diffusion of light hydrocarbons through nearsurface rocks. Nature, 284 522-525. 

Dahlgrcn, R. A. (1994). Soil acidification and nitrogen saturation from weathering of ammonium-bearing rock. Nature 368, 838-811. 

Andrews JN, Kay RLF (1982) Natural production of tritium in permeable rocks. Nature 298 361-363... 

Kuroda PK (1960) Nuclear fission in the early history of the Earth. Nature 187 36-38 Kurz MD (1986) Cosmogenic helium in a terrestrial igneous rock. Nature 320 435-439 Kurz MD, Jenkins WJ, Hart SR (1982) Helium isotopic systematics of oceanic islands and mantle heterogeneity. Nature 297 43-47... 

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