 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
 |
|
|||||||||||||||||||||
 |
 |
 |
 |
 |
 |
 |
 |
 |
|
|||||||||||||
 |
 |
 |
 |
 |
 |
|
||||||||||||||||
 |
 |
 |
 |
|
||||||||||||||||||
 |
 |
 |
 |
|
||||||||||||||||||
 |
 |
 |
|
|||||||||||||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|||||||||||||||||||||
|
|
|
|
|
|
|
|
|
|
|||||||||||||
|
|
|
|
|
|
|
||||||||||||||||
|
|
|
|
|
||||||||||||||||||
|
|
|
|
|
||||||||||||||||||
|
|
|
|
|||||||||||||||||||
CaCO3
Orthorhombic
Aragonite, a calcium carbonate mineral, was first reported by Dana (1868) and is known from both Franklin and Sterling Hill. It is relatively uncommon and was found in abundance but once; calcite is much more common locally. The known occurrences are secondary; aragonite occurs as acicular crystals and druses in veins and cavities. Physical and chemical data have not been published, but Frondel (1972) reported the presence of Zn in some specimens. The fluorescence in ultraviolet is white or pale green in shortwave and longwave ultraviolet.
The best aragonite specimens are found at Sterling Hill, where they formed in the pits and the mud zone as large (up to 45 cm) plate-like masses of crystals which are up to 5 cm in length, but quite variable. These specimens are generally free of associated minerals. An occurrence associated with oxidized sulfides was reported by Jenkins and Misiur (1994). Aragonite occurs at Franklin sporadically as large, splayed 5 cm masses and as acicular to prismatic crystals found uncommonly in secondary veins and vugs.
 |
|
|||
|
|
||||
|
||||
| Copyright © 1995 by Pete J. Dunn |
Website
by Herb Yeates
|
|||
|
|
|
|||
|
Link
to homepage
|
||||
|
This
page created: January 11, 2001 |
||||
|
|
|
|||
