..., British Guiana. The pebbles, normally under a centimeter in size, but occasionally ten times as large, were described by Bracewell (1946) as a new mineral, merumite. Actually, merumite is not a simple mineral, or even an essentially single though impure species, but rather an aggregate of eskolaite...

... sands, merumite, carbonatites, pegmatites, and marl. The Silvermine area occurrence appears to be a variation in the suite of late carbonates and rare phosphates that are universally present in tin–tungsten type mineralization. Copyright © 1984 by the Mineralogical Society of America 1984 ...

..., a polymorph of CrOOH, is a rare mineral, previously described from only three locations. It is named for the type locality in Guyana where it occurs as a component of so-called “merumite” pebbles in gold and diamond placer deposits in the Merume River ( Milton and Narain 1969 ; Milton et al. 1976...

... C. Chao E.C.T. ( 1958 ) Eskolaite, Cr 2 O 3 , in “merumite” from British Guyana . American Mineralogist 43 , 1203 . Milton C. Appleman D. Chao E.C.T. Cuttita F. Dinnin J.L. Dwornik E.J. Hall M. Ingram B.L. Rose H.J. Jr. ( 1968 ) Mineralogy...

... analogue, β-CrOOH. Guyanaite, β-CrOOH, is named after localities along the Merume River, Mazaruni district, Guyana ( Milton & Narain, 1969 ; Milton et al ., 1976 ), where it is found in hydrothermally formed Cr-rich alluvial shingle deposits named merumite. In these rocks, guyanaite is intergrown...

... important questions to be made. Mcconnellite (CuCrO 2 , R $\bar{3}$ m , a  =  b  = 2.983(4) Å, c  = 17.16(3) Å) was known from only one locality – Merume River, Kamakusa, Potaro-Siparuni Region, Guyana, in hydrothermal Cr-bearing ore, so called, ‘merumite’ type (Milton et al. , 1976...

...) polymorphs: bracewellite, grimaldiite, and guyanaite, all with Cr 3+ , encountered in merumite (hydrothermally altered cinder and sandstone). These minerals can bear minor V but, judging by field and laboratory data, they crystallize at temperatures of 140 °C and higher, which rules out precipitation from...

.... There are three CrOOH polymorphs: α-CrOOH, grimaldiite, β-CrOOH, guyanaite, and γ-CrOOH, bracewellite. These phases are rare and only occur in a few locations with merumite, a hydrated Cr-hydroxide ore discovered in Guyana, being the most prominent host of all three phases ( Bracewell 1946 ; Milton et al. 1976...

... complex (Kola Peninsula) . Zapiski RMO 6 , 41 – 54 . Milton , C. , Appleman , D.E. , Appleman , M.H. , Chao , E.C.T. , Cuttitta , F. , Dinnin , J.I. , Dwornik , E.J. , Ingram , B.L. , Rose , H.J. , Jr. , 1976 . Merumite...

.... , 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. ( 1976 ) Merumite—A Complex Assemblage of Chromium Minerals from Guyana. Geological Survey Professional Paper 887 , U.S. Government...

.... , 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. ( 1976 ) Merumite, a complex assemblage of chromium minerals from Guyana . U.S. Geological Survey Professional Paper 887 , 1 – 29...

...-8 . Milton , C. , Appleman , D.E. , Appleman , M.H. , Chao , E.C.T. , Cuttitta , F. , Dinnin , J.I. , Dwornik , E.J. , Ingram , B.L. , Rose , H.J. Jr. , 1976 . Merumite, a complex assemblage of chromium minerals from...