Minas Gerais, Brazil Displaying the very large and superb, deep purple gem quality crystals for which the finest amethyst of the Minas Gerais region is famous, a matched pair of amethyst geode halves exhibits a desirable cathedral shape. Geodes are formed within voids produced by gas bubbles in volcanic rock, into which mineral-laden water seeps, then crystallizes over the eons. These are exceptional display specimens. Each specimen measures approximately 26 x 26 x 9in
Minas Gerais, Brazil Displaying the very large and superb, deep purple gem quality crystals for which the finest amethyst of the Minas Gerais region is famous, a matched pair of amethyst geode halves exhibits a desirable cathedral shape. Geodes are formed within voids produced by gas bubbles in volcanic rock, into which mineral-laden water seeps, then crystallizes over the eons. These are exceptional display specimens. Each specimen measures approximately 26 x 26 x 9in
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
