Cobalt bloom

Erdkobalt, m. earthy cobalt, asbolite. — griiner —, nickel ocher (annabergite) roter —, cobalt crust (earthy erythrite) roter strahli-ger —, cobalt bloom (erythrite),... 

Cobalt bloom. Cobalt glance. Cobaltite See Erythrite See Cobaltite CoAsS Silver- 6-2 6-5 Cubic... 

Cobalt Arsenates.—The ortho-arsenate, Co3(As04)2.8IT20, occurs in nature as erythrite or cobalt bloom in the form of monoclinic crystals isomorphous with vivianite, Fes(P04)2.8lI20, and perhaps with nickel ochre, Ni3(As04)z.8H20. Its crystallographic elements are ... 

Cobalt bloom. Co3(As)4)2 8H20. A natural hydrated cobalt arsenate. 

Synonyms erythritol cobalt bloom cobalt arsenate... 

Smaltite, also known as skutterudite or tin white cobalt, is a cobalt arsenate mineral with composition (Co,Ni)As3 , in which the cobalt content exceeds that of nickel iron is a common impurity. It occurs as metallic silver-white cubes or with massive form, often with pink surfaces caused by oxidation (cobalt bloom) to erythrite q.v.). Smaltite is named after its discovery at Skutterud (Norway) and its use in the production of smalt q.v.). If forms in hydrothermal veins associated with cobalt deposits in areas such as Cobalt (Ontario, Canada), Freiberg (Germany), Andalusia (Spain) and Cornwall (England). 

Effects of Pentavalent Sb Ions on the Adsorption of Divalent Co-57 on Hematite. Benjamin and Bloom reported that arsenate ions enhance the adsorption of cobaltous ions on amorphous iron oxyhydroxide (J 6). Similarly, when divalent Co-57 ions were adsorbed on hematite together with pentavalent Sb ions, an increase of adsorption in the weakly acidic region was observed. For example, when 30 mg of hematite was shaken with 10 cm3 of 0.1 mol/dm3 KC1 solution at pH 5.5 containing carrier-free Co-57 and about 1 mg of pentavalent Sb ions, 95 % of Co-57 and about 30 % of Sb ions were adsorbed. The emission spectra of the divalent Co-57.ions adsorbed under these conditions are shown in Figure 8 together with the results obtained under different conditions. As seen in Figure 8, the spectra of divalent Co-57 co-adsorbed with pentavalent Sb ions are much different from those of Co-57 adsorbed alone (Figure 3). These observations show a marked effect of the.co-adsorbed pentavalent Sb ions on the chemical structure of adsorbed Co-57. 

Trace metal adsorption on goethite is reportedly increased by the presence of sulphate ions (Balistrieri and Murray, 1982). Arsenate and antimony oxyanions enhance uptake of cobalt on ferrihydrite and hematite, respectively (Benjamin and Bloom,... 

Peach Bloom. A glaze effect on pottery produced by the Chinese and characterized by its soft pink colour with patches of deeper red. It is achieved by the addition of copper oxide to a high-alkali glaze but requires very careful control of the kiln atmosphere the bloom results from incipient devitrification of the glaze surface. Peacock Blue. A ceramic colour made from a batch such as 33% Cobalt oxide, 7% standard black (q.v.), 45% China Stone, 15% Flint. 

---