Prehnite, Calcite and Epidote on MatrixNBB 150

Prehnite, calcite and epidote, on matrix

Measurements:  54 x 44 x 20 mm

Description:  A high quality prehnite aggregate shares a basalt matrix with calcite crystals and bits of epidote, as well as a few very minute (?)analcime crystals. 

The prehnite apears to be undamaged, but some of the calcite crystals are badly damaged.

Weight of Specimen:  53.7 g

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

                                        NaAl(Si2O6)•(H2O)  (analcime) 

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

                                           (analcime)  5 

Location:  Brandberg, Namibia.

Specimen Code:  NBB 150

US $ 65

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