cobalt bloom

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Related to cobalt bloom: Annabergite, Red cobalt

cobalt bloom

(Minerals) another name for erythrite1
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ɪˈrɪθ raɪt, ˈɛr əˌθraɪt)

a mineral, hydrous cobalt arsenate, Co3As2O8∙8H2O, occurring as a powdery, usu. red incrustation on cobalt minerals; cobalt bloom.
[1835–45; < Greek erythr(ós) red + -ite1]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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Noun1.cobalt bloom - a reddish mineral consisting of hydrated cobalt arsenate in monoclinic crystalline form and used in coloring glass; usually found in veins bearing cobalt and arsenic
mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
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A good indicator was the pink colouration of the cobalt bloom. The 1906 Bureau of Mines Report described the difficulties encountered in this form of mining:
[This agrees with the modern geological map of the area.] About a mile WNW of Vermaak's there is another mine in the same range, and the lovely rash on the rocks shows cobalt bloom, and an attempt with the hammer produces cobaltite.
By far the most plentiful variety of erythrite is the so-called "cobalt bloom," which is actually a mass of velvety, pale pink microcrystals growing perpendicular to the matrix surface, or in some cases as puffballs.