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Pseudomorphs—Limonite after Siderite

These specimens are fine examples of pseudomorphs.  In these samples, an iron mineral (limonite) has replaced and taken the form of a carbonate mineral (siderite).  The result is limonite exhibiting rhombohedral form.  Limonite is not a particularly attractive mineral, but these pseudomorphs are interesting to collectors.

 Over $10

 

 

 

All specimens on this page are from Teller County, CO

ID# 400-6 A mass of dark reddish-brown limonite pseudomorph after siderite with grey microcline. The rhombohedral form of siderite is exhibited in multiple locations across the specimen. 

Teller County, Colorado $12

ID# 168-2 A mass of dark reddish-brown limonite pseudomorph after siderite with light green amazonite and dary smoky quartz. The rhombohedral form of siderite is exhibited in multiple locations across the specimen.  The base of the specimen is coated with multiple light green microcline and amazonite crystals.  The tip of the single large smoky quartz has been cut off

(why anyone would have cut it is beyond me).

Teller County, Colorado $12