A Geoscience Digital Image Library

TitleCyanotrichite with allophane, azurite and hisingerite
DescriptionThis sample contains light blue cyanotrichite, dark blue azurite, brown hisingerite, and yellowish allophane. Hisingerite and allophane belong to the same mineral group. Allophane is a hydrated aluminum silicate; hisingerite is a hydrated iron silicate hydroxide. Both are generally poorly crystalline or even amorphous, so their compositions are variable. Cyanotrichite is a hydrated copper-aluminum sulfate hydroxide. Azurite is a copper carbonate hydroxide. These are all secondary minerals, often associated with ore deposits.
LocationUSA ▹ Idaho ▹ Lemhi County
PhotographerNessa Eull. 2001-06-06.
CollectionUniversity of North Dakota Mineralogy Collection #814.
Key wordscyanotrichite, allophane, azurite, hisingerite, Idaho
Tech details831 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens.
GeoDIL number638