Tourmaline on Quartz – NER 022

Dark blue tourmaline crystal on quartz

Measurements:  45 x 34 x 23 mm  

Description:  A dark blue tourmaline crystal (26 mm long), together with a few small bits of tourmaline crystals, sits partially embedded in a piece of quartz matrix.

The main tourmaline crystal has a small, stable crack, a large pressure mark and a few small nicks.

Weight of Specimen:  49.8 g

Chemical Composition:  Na(Li,Al)3Al6(BO3)3Si6O18(OH)4  (tourmaline)
                                 SiO2  (quartz)

Hardness on Mohs Scale:  (tourmaline)  7 - 7.5

Location:  Karibib, Erongo Region, Namibia.

Specimen Code:  NER 022

US $ 12

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