Quartz with Tourmaline NAM 020

Green tourmaline crystals in quartz

Measurements:  150 x 100 x 60 mm

Description:  Green tourmaline crystals sit in quartz, along with lots of mica and feldspar. Some tourmaline crystals run into the quartz. 

Most crystals are damaged. A small area on the specimen has been trimmed.

Weight of Specimen:
 
1 168 g  (1.168 kg)

Chemical Composition:  Na(Li,Al)3Al6(BO3)3Si6O18(OH)4 (tourmaline) 
                                        SiO2 (quartz)
                                        KAlSi3O8 (feldspar)
                                         
KAl2(Si3Al)O10(OH,F)2 (mica)
                       
Hardness on Mohs Scale:   (tourmaline)  7 – 7.5
                                            (quartz)  7
                                            (feldspar)
  6 - 6.5
                                            (mica
2-2.5

Location:  Karibib district, Erongo region, Namibia.

Specimen Code:  NAM 020

R 450

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