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Name:From the Merume river, Guyana.
A Mixture Of:Bracewellite, Eskolaite, Gahnite, Gold, Grimaldiite, Guyanaite, Mcconnellite, Pyrophyllite, Quartz

Originally described as"Cr2O3.H2O" [American Mineralogist, 34, 339 (1949)], but now known to be mostly eskolaite, intergrown with varying proportions of four other fine-grained chromium minerals. Occurs as hard black pebbles in river placers. It is important to note that while merumite grains (which are known up to 8 cm in diameter) are currently unknown as a pure species, most grains rarely have more than a few species intergrown, including quartz, gold, pyrophyllite, gahnite, eskolaite, and sometimes other species the locality is known for. Fraudulently labeled specimens are more commonly known than verified specimens.

Classification of Merumite

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Type Occurrence of Merumite

Type Locality:Director Creek, Merume river, Kamakusa, Mazaruni District, Guyana

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Merumite

Reference List:

- +
Milton, C., Appleman, D. E., Appleman, M. H., Chao, E. C. T., Cuttitta, F., Dinnin, J. I., Dwornik, E. J., Ingram, B. L. and Rose, H. J., Jr. (1976): Merumite, a complex assemblage of chromium minerals from Guyana. U.S. Geol. Surv. Prof. Paper 887, 1-29. - American Mineralogist (1977), 62, 593 (abstract).

Internet Links for Merumite

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  • Localities for Merumite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    • Mazaruni District
      • Kamakusa
    Am. Mineral., 34, 339 (1949)
    Charles Milton et al. (1967)
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    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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