Phlebolith

Phlebolite is a natural inorganic mineral substance that is formed as a result of recrystallization of basic rocks - igneous and metamorphic quartzite-sandstones containing an increased amount of plagioclase. Does not contain organic impurities and compounds.

Also, phleboliths are known as eternal stones. Phleboliths are most often decorative items due to their natural beauty, transparency or color. In India, phleboliths have a long history of use as building materials. Ancient architects used phlebolite slabs as ordinary stones for construction. Geology also confirms that phleboliths were abundant in the past. They formed mainly in a fossilized siliceous rim containing plagioclase. This area is northwest of Kolkata and east of Rajendranagar. These ancient rocks contain a variety of limestone, calcareous conglomerate and calciphyres.

Phlebolithic rock formations were widespread throughout the world both in the past and today. These were probably unique natural phenomena. The phlebolithic reef forms alternating layers of well-sorted sand and marl, as well as volcanic debris, which give it a grayish or black color with a greenish tint. It has a regular structure that varies noticeably along the strike. Some phlebovite rock outcrops are up to 150 m thick and have a surface area of ​​up to 4 km².

The structure and composition of the phlebolith determine its biochemical characteristics. The composition contains trace elements - cobalt, nickel, zinc, copper, manganese, molybdenum, chromium, lead and rare earths (except lanthanides). They also studied acids formed due to the disintegration of calcareous shells of mollusks.