At-A-Glance
Country of Origin
NJ
United States
Photos
Essential Information
Specimen ID
6489
Mineral Name
Hendricksite
Mineral Variety
Caswellite
Chemical Formula
K(Zn,Mg,Mn)3Si3AlO10(OH)2
Subcollection
Franklin and Sterling Hill Suite
Additional Details
Associated Minerals
Rhodonite
Andradite
Calcite
Specimen Number
F116
Notes for Researchers
7/462c
Physical Description
Nice reference specimen showing various stages of alteration in caswellite. “Caswellite” is a local term for hydrothermally altered mica, in large part originally hendricksite. The mineralogical composition of caswellite is different from specimen to specimen and is another topic deserving of modern study.
Geographic Origin
Locality Nickname
Franklin, New Jersey
Locality Lat/Long
41.1220409, -74.5804378
Mining District
Franklin Mining District
Mine Name
Franklin Mine