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Schorl

schorl
Rough schorl

Schorl is the black , iron-rich form of tourmaline, and is very common. The opaque, prismatic crystals may be several metres in length.

Schorl is found in pegmatites. During the Victorian era, black tourmaline was widely used for mourning jewellery, but today it has little, if any, value as a gemstone.

Schorl Pictures

Schorl (black tourmaline) with striations

Chemical Composition : Complex borosilicate
Crystal System / Forms :

Trigonal


Cuts & Uses :

Brilliant, Mixed.


Hardness : 7.5
Lustre : Vitreous
Refractive Index / Birefringence :

1.62-1.64 / 0.018


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