A Geoscience Digital Image Library

DescriptionPrehnite, Ca2Al2Si3O10(OH)2, is a green to grayish-white or colorless orthorhombic mineral occurring as granular masses and crystal aggregates, having a specific gravity of 2.90 to 2.95 and a hardness of 6 to 6.5 on the Mohs scale. Typical prehnite forms rather thick crusts with a rough or crystaline texture. It is found in cavities in basic igneous rocks and with hydrothermally altered rocks. Prehnite was named after the Dutch Colonel, H. Von Prehn (1733-1785).
LocationUSA ▹ New Jersey. Near Patterson.
PhotographerShannon Heinle. 2002-02-07.
CollectionUniversity of North Dakota Mineralogy Collection #1269.
Key wordsprehnite, new jersey, silicate
Tech details545 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens.
GeoDIL number2258