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Quartz Crystal with Analcime and (?)Pumpellyite on Matrix - NBB 193

Quartz crystal with analcime on quartz and basalt matrix

Measurements:  60 x 53 x 42 mm

Description:  Two quartz crystals have fused together, resulting in a crystal with two perfect terminations. Two of the shaft facets are partially covered with minute analcime and (?)pumpellyite crystals. A few minute hematite specks and threads are included.

The crystals share a basalt matrix with at least two calcite crystals and small quartz crystals. 

Towards the back of the biggest crystal is a neat pressure mark, at the base of the termination ridge. At the base of the main crystal is a thin flaw. Some of the small crystals along the edges of the matrix have some damage. 

The specimen displays well on a flat surface, with the main crystal at an angle of about 50º.

Weight of Specimen:  68.7 g

Chemical Composition:  SiO2  (quartz)
                                                         Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O  (pumpellyite-Mg)  

Hardness on Mohs Scale:  7  (quartz)
                                           5.5  (pumpellyite-Mg)

Location:  Brandberg, Namibia.

Specimen Code:  NBB 193

US $ 130

 

        
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