Dictionary of Gems and Gemology

2009 Edition
| Editors: Mohsen Manutchehr-Danai

nephroid

Reference work entry
DOI: https://doi.org/10.1007/978-3-540-72816-0_15151
a mineral, in which radiation aggregates terminate in a rounded mass with smooth, hummocky rounded surface. Also called  kidney-like,  kidney-shaped.  Mammillary.
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© Springer-Verlag Berlin Heidelberg New York 2009