Quartz with Calcite and Prehnite, on Matrix - NBB 061

Measurements:  82 x 45 x 36 mm 

Description:  A beautiful specimen consisting of several lovely quartz crystals, some with a faint amethyst colouring, and some having beautiful red and blueish hematite inclusions, along with several calcite and a few straw-coloured prehnite crystals, on a basalt matrix. 

The harlequin crystal appears to be without any damage. Some of the other crystals have a few minute to small nicks. There is some damage towards some of the edges of the specimen, and near the side are the remains of a quartz crystal that broke off previously.

The specimen, which has been trimmed on one of its short sides, displays well on a flat surface.

Weight of Specimen:  97.3 g

Chemical Composition:  SiO₂  (quartz)
                                       Ca₂Al₂Si₃O₁₀(OH)₂  (prehnite)                                                                 CaCO₃  (calcite)                    .

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

Location:  Brandberg, Namibia.

Specimen Code:  NBB 061

US $ 120