Roger Weller, geology instructor
email@example.com copyright 2010-R.Weller
In massive form, siderite looks like a calcite that is colored by iron oxide. Unlike
calcite, however, siderite will not fizz when subjected to hydrochloric acid.
Photo is copyright free only for non-commercial educational uses.
Just credit photo to R.Weller/Cochise College.
Specimen courtesy of Dave Dechant