Such is the story of an Arkansas man who drank so much iced tea that it led him to develop kidney failure. Three Arkansas doctors described the case in a letter published by the New England Journal of Medicine this week.
What is Marble? Marble is a metamorphic rock that forms when limestone is subjected to the heat and pressure of metamorphism. It is composed primarily of the mineral calcite (CaCO3) and usually contains other minerals, such as clay minerals, micas, quartz, pyrite, iron oxides, and graphite.
Marble's crystals are usually larger than limestone's crystals. Like limestone, marble is usually made of calcite, so it usually fizzes gently when you put a drop of white vinegar on it. Chert: Pieces of chalky white or dark chert are sometimes mixed with limestone gravel.