Geodes of (?) Shattuckite and Calcite, on Matrix – NKO 017

Dioptase crystals on matrix



Measurements:  32 x 27 x 24 mm

Description:  An exposed geode of (what looks like) shattuckite and calcite, sits on a dolomite matrix. There is also a small geode at the back of the bigger geode, as well as a few minute to very small dioptase crystals on the specimen. Image bottom left shows the bottom of the specimen.

There is some damage to the exposed edges of the geode.

Weight of Specimen:  12.2 g  

Chemical Composition:  Cu5(OH)2(SiO3)4  (shattuckite) 
                                       CaMg(CO3)2 
(dolomite)  
                                       Cu2+SiO2(OH)2  (dioptase)
                                      
Hardness on Mohs Scale:  (shattuckite)  3.5
                                       
 (dolomite)  3.5-4
                                         (dioptase)  5
                                 
Location:  Kaokoland, Northern Namibia.

Specimen Code:  NKO 017

US $ 20

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