Quartz Crystal with Three Other Minerals, on Matrix – NBB 177 

Measurements:  56 x 22 x 17 mm

Description:  A lovely, gemmy,  clear quartz crystal with very pale green bits of prehnite attached to its surface. Along with a few calcite and analcime crystals at its base, it sits on a small matrix of quartz and basalt rock. There is a very faint light smoky phantom.

There are a few natural pressure marks to the specimen, and only a few extremely minute nicks to the termination (hardly visible with the naked eye). There is a small quartz crystal fused to the side of the quartz crystal, which has lost its termination.

Weight of Specimen:  17.8 g

Chemical Composition:  SiO₂  (quartz)
                                       Ca₂Al₂Si₃O₁₀(OH)₂  (prehnite) 
                                        NaAl(Si₂O₆)•(H₂O)  (analcime)   
                                        CaCO₃  (calcite)                     

Hardness on Mohs Scale:  (quartz)  7      
                                          (prehnite)  6-6.5                                                                                                        (analcime) 5  
                                          (calcite)  3     

Location:   Brandberg, Namibia.    

Specimen Code:  NBB 177

US $ 40