Affiliation:
1. Diamond and Precious Metal Geology Institute, Siberian Branch of the Russian Academy of Sciences
Abstract
Oxalates, which are salts of oxalic acid, belong to a large group of organic minerals or biominerals that can occur both in the natural environment and inside living organisms, which makes them valuable for various sciences. We have discovered, for the first time, oxalates in several natural samples from the Daldynsky kimberlite field, the basin of the middle course of the Markha River, and the coastal outcrop on the Allah Yun River. We also confirmed their presence in kidney and gallbladder stone samples in the human body. X-ray phase analysis allowed us to establish the presence of weddellite or whewellite in association with quartz, dolomite, feldspar, mica, and chlorite in the samples under study. Meanwhile, the composition of the kidney stone in the human body represents a mixture of whewellite with uricite, the composition of the stone from the gallbladder includes uricite, whewellite, ammonium urate and brushite. Possible reasons for the formation of one- and two-in-one modifications of calcium oxalates in nature are also discussed. We conclude that these minerals are more widespread than previously assumed.
Publisher
Academy of Sciences of the Republic of Sakha (Yakutia)
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