Forsteritic olivine

Grandstaff, D. E. (1986), The Dissolution Rate of Forsteritic Olivine from Hawaiian Beach Sand", in S. M. Colman and D. P. Dethier, Eds., Rates of Chemical Weathering of Rocks and Minerals, Academic Press, pp. 41 -59. 

Figure 1,17 Absorption spectrum of a forsteritic olivine under polarized light. Ordinate axis represents optical density (relative absorption intensity, ///q). From R. G. Burns (1970), Mineralogical Applications of Crystal Field Theory. Reprinted with the permission of Cambridge University Press.

Grandstalf D. E. (1980). The dissolution rate of forsterite olivine from Hawaiian beach sand. In Third International Symposium on Water-Rock Interaction Proceedings, Alberta Research Council, Edmonton. 

The observation that Cr and Ni are enriched in earliest minerals crystallizing from magma such as chromite and forsteritic olivines discussed in earlier sections ( 8.5) has led to the widespread use of the abundances of these particular... 

Radiative heat transport through olivine has been discussed extensively (e.g., Fukao et al., 1968 Shankland, 1970 Schatz and Simmons, 1972 Scharmeli, 1979 Shankland et al., 1979). The radiative thermal conductivity, Kt of forsteritic olivine increases with rising temperature and would contribute to heat flow in the Upper Mantle (Shankland et al., 1979). However, values of Kt for olivine are considered to be rather low to satisfactorily explain the dissipation of the Earth s internal heat by radiation and lattice conduction alone. Note, however, that Fe2 CF transitions in almandine, pyroxenes (M2 site) and, perhaps, silicate perovskites absorb strongly in the wavelength range 1,250 to... 

Figure 17 Backscattered electron images of three chondrules in Tieschitz (H/L3.6) chondrite. (a) Type lA porphyritic chondrule composed largely of forsteritic olivine (ol), mesostasis (mes), metallic Fe,Ni droplets (white). Dusty olivines are relict, FeO-rich olivines that crystallized elsewhere and formed tiny metallic Fe,Ni particles when heated in the chondrule melt, (b) Type IIA porphyritic chondrule containing large euhedral, FeO-bearing, olivine phenocrysts, dark mesostasis (mes), and white sulfide droplets (sf). (c) Nonporphyritic chondrule containing fine pyroxene crystals that appear to radiate from the upper edge of the chondrule.

Figure 22 Combined elemental map in magnesium (red), calcium (green), and A1 K (blue) X-rays ((a), (b)) and backscattered electron images ((b), (d)) of two barred or skeletal olivine chondrules, and a combined X-ray map (e) and NiKa scanning map (f) of a zoned Fe,Ni metal grain with an enclosed cryptocrystalline chondrule (CC) in the CBb chondrite HaH 237 (Krot et al, 2002a). The chondrules, which contain forsteritic olivine (ol), low-calcium pyroxene (px), high-calcium pyroxene (cpx) and mesostasis (mes), lack rims and relict grains and clearly formed in a dust-free environment from total melts (reproduced by permission of University of Arizona on behalf of The Meteoritical...

Grandstaff, D.E. 1986. The dissolution rate of forsteritic olivine from Hawaiian beach sand, p. 41-59. In S.M. Colman and D.P. Dethier (ed.) Rates of chemical weathering of rocks and minerals. Academic Press, New York. 

Orthosilicates Forsterite Olivine and garnet refer to Oxide a (nm) c (nm) Density (g/cnf)... 

Van Herk, X, Pietersen, H.S., Schuiling, R.D. (1989). Neutralization of industrial waste acids with olivine - the dissolution of forsteritic olivine at 40-70°C. Chemical Geology, 76, 341-352. 

FIG. 6 Variation in dissolution rates of albite (NaAISi3 Og ) and forsterite olivine (Mg2 Si04) as a function of solution pH. (From Refs. 25 and 26.)... 

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