Cuba, elements

The first source of chromium was found in the mineral crocoite. Today it is obtained from the mineral chromite (FeCr O ), which is found in Cuba, Zimbabwe, South Africa, Turkey, Russia, and the Philippines. Chromite is an ordinary blackish substance that was ignored for many years. There are different grades and forms of chromium ores and compounds, based on the classification of use of the element. Most oxides of chromium are found mixed with other metals, such as iron, magnesium, or aluminum. 

Cobalt ranks number 33 in abundance of the elements in the earth s crust, which contains on average 20-pg Co/g, although soil levels of up to 2000- J,g Co/g are found in Zaire and New Zealand. Significant deposits of cobalt are found in Canada, Russia, Zambia, and Congo, with these countries accounting for approximately 65% of the current total world supply. Smaller deposits are found in Cuba, New Caledonia, and Australia. Cobalt does not exist as the free metal in nature, but occurs in approximately 200 ores, of which smaltite (C0AS2), cobaltite (CoAsS), and linnaeite (C03S4) are commercially important. 

The harzburgites and dunites from the Oman and Cuba ophiolites show relatively homogenous PM-normalized trace-element patterns characterized by (i) a subtle (Cuba) to significant (Oman)... 

Figure 17 Abundances of lithophile trace elements normalized to PM values in ophiolitic peridotites from Oman and Cuba, and in abyssal peridotites from the East Pacific Rise and the Izu-Bonin-Mariana Forearc (whole-rock analyses). Ophiolitic peridotites data from Godard et al. (2000) (reproduced by permission of Elsevier from Earth Planet. Set Lett. 2000,180, 133-148) for Oman, and from Proenza et al. (1999) for Cuba abyssal peridotites data from Niu and Hekinian (1997a) and Godard (unpublished) for the East Pacific Rise, and from Parkinson and Pearce (1998) for the Izu-Bonin-Mariana Forearc. Normalizing values after Sun and McDonough (1989).

Imported Inorganic Chemical Elements, Oxides and Halogen Salts in Cuba, 2002... 

Nickel is widely distributed in nature forming about 0.008% of the earth s crust. It ranks 24th among the elements in order of abundance [2]. The most important nickel ores are pentlandite, a nickel/iron sulfide, and gamierite, a nickel/magnesium silicate containing 35% and 2.5% of nickel, respectively. Deposits of these ores are in Canada, New Caledonia, Cuba, the Dominican Republic, and Indonesia. 

B. Weniger and L. Robineau, in C. Gyllenhaal and D. D. Soejarto, eds., Elements for a Caribbean Pharmacopeia, Enda-Caribe, Ministry of Public Health, Cuba, 1988, p. 207. 

Weniger, B. andL. Robineau. 19. Elements for a Caribbean Pharmacopeia. Tramil 3 Workshop, Havana, Cuba. November 1988. 

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