Based on the Random House Dictionary, © Random House, Inc. 2012.
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| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
| a gadget; dingus; thingumbob. |
| erythrite (ɪˈrɪθraɪt) | |
| —n | |
| 1. | Also called: cobalt bloom a pink to purple secondary mineral consisting of hydrated cobalt arsenate in monoclinic crystalline form. Formula: Co3(AsO4)2.8H2O |
| 2. | another name for erythritol |
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erythrite
arsenatearsenate mineral in the vivianite group, hydrated cobalt arsenate [Co3(AsO4)28H2O]. Erythrite, which is used as a guide to the presence of cobalt-nickel-silver ores because of its crimson or peach-red colour, occurs as radiating crystals, concretions, or earthy masses in the oxidized zone of cobalt and nickel deposits. It forms a complete solid-solution series with annabergite, in which nickel replaces cobalt in the erythrite structure. As the nickel content increases, the colour lightens to white, gray, or pale green. Erythrite occurs in Schneeberg, Ger.; Allemont, France; Cornwall and Cumberland, Eng.; Chile; Morocco; and the southwestern United States. For detailed physical properties, see arsenate mineral (table)
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