Joaquinite is a cyclosilicate with 4-membered silica rings. The individual silica rings are bonded together by titanium (Ti) and iron (Fe), while barium (Ba) and cerium (Ce) are the charge-balancing cations. Water is also present in the structure. Joaquinite has a monoclinic crystal system.
Highlighting FeaturesSilicon (Si) atoms A 4-member silica ring Oxygen (O) atoms Barium (Ba) atoms Cerium (Ce) atoms Iron (Fe) atoms Titanium (Ti) atoms Show the silicate backbone All atoms
Joaquinite was discovered in California. It is rather rare, but is a good example of a 4-membered cyclosilicate structure.
Dowty, E. 1975. Crystal structure of joaquinite. American Mineralogist 60:872-878.