Quartz, Calcite, Prehnite and Epidote on Matrix BARG 025

Yellow fluorite crystal specimen

Measurements:  87 x 58 x 21 mm  

Description:  Quartz and calcite crystals share a matrix of mixed minerals with prehnite and epidote. About three of the very small quartz crystals have reddish hematite specks and threads in them. 

Damage is limited to a few minute to very small nicks to the crystals, and damage to the edges of the specimen.

Weight of Specimen:  84.2 g

Chemical Composition:  SiO2  (quartz)
                                   CaCO3   (calcite)                               
                                   Ca2Al2Si3O10(OH)2
   (prehnite)  
                                   Ca2(Fe3+, Al)3(SiO4)3(OH)   (epidote)    

Hardness on Mohs Scale:  (quartz)  7 
                                                (
calcite)  3
 
                                      (prehnite)  6-6.5
                                      (epidote) 7                                                

Location:  Brandberg, Namibia.

Specimen Code:  BARG 025

US $ 45




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