A Geoscience Digital Image Library

DescriptionThaumasite is a hydrated calcium silicon carbonate sulfate hydroxide with the chemical formula Ca3Si(CO3)(SO4)(OH)6-12H2O. It is sometimes classified as a silicate and can be classified as a carbonate but is predominately classified as a sulfate. Thaumasite is almost entirely water. Four out of every five atoms in this mineral is either a part of a water molecule or a hydroxide. Thaumasite is a fairly rare mineral and its name comes from the Greek thaumasion meaning “surprising”. This sample is approximately 7 cm.
LocationUSA ▹ New Jersey. Near Patterson.
PhotographerShannon Heinle. 2002-01-22.
CollectionUniversity of North Dakota Mineralogy Collection #1899.
Key wordsthaumasite, sulfate, silicate, carbonate
Tech details199 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens.
GeoDIL number2171