Amethyst Quartz and Laumontite Crystals on Matrix - NBB 188

Amethyst quartz and laumontite crystals on matrix







Measurements:  40 x 32 x 29 mm

Description:  Two small, undamaged amethyst quartz crystals share a feldspar / quartz matrix with small, white laumontite crystals. Laumontite crystals from this area is not very common.

Weight of Specimen:  21.9 g

Chemical Composition:   SiO2  (quartz)
                                       CaAl2Si4O12  4H2O  (laumontite) 
                                       KAlSi3O8
 (feldspar) 

Hardness on Mohs Scale:  (quartz)  7
                                          (laumontite)  3 - 4
                                          (feldspar)
  6 - 6.5

Location:  Brandberg, Namibia.

Specimen Code:  NBB 188

US $ 55


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