31. There are several others, such as ammonium oxalate . 32. However, rhubarb is high in oxalates , which tend to retard calcium absorption. 33. Antifreeze is ethylene glycol, and it metabolizes into oxalate crystals in the kidneys. 34. An autopsy on April 27 found calcium oxalate crystals in Thompson's kidneys. 35. The oxalates are converted to oxides by annealing. 36. The mineral form of sodium oxalate is natroxalate. 37. Calcium oxalate is a common compound found in many fungi, including the earthstars. 38. It has few to many calcium oxalate crystals that are 3 8 ?m diameter. 39. Oxalotrophic bacteria are capable of using oxalate as a sole carbon and energy source. 40. But sodium oxalate has to be heated to 520 degrees to zap the ozone pollution.