A Geoscience Digital Image Library

TitleCuspidine and calcite
DescriptionCuspidine is a sorosilicate with the chemical formula Ca4Si2O7(F,OH)2. Cuspidine appears as a fluorescent yellow under ultraviolet light. It is an uncommon mineral. It is found in only a few locations in the world. Cuspidine has been found at Franklin, New Jersey as glassy-white fragments of crystals associated with nasonite and in metamorphosed limestone blocks elected from Monte Somma and in the peperino of the Alban Hills. All sites it has been found at confirm its pneumatolytic origin. This sample is approximately 12 cm.
LocationUSA ▹ California. Near Crestmore.
PhotographerShannon Heinle. 2002-01-17.
CollectionUniversity of North Dakota Mineralogy Collection #1316.
Key wordscuspidine, sorosilicate, frankline, monte somma, alban hills
Tech details657 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens.
GeoDIL number2127