mineral specimens
rare minerals
mineral dealer
systematic minerals
Black Hills minerals
fine minerals
mineral dealer
Dana minerals
IMA minerals
mineral collections
rock and minerals
gem crystal
0 item @ $0.00  

Tourmaline in Andesite breccia silver - gold ore

#49109

Tourmaline in Andesite breccia silver - gold ore

#49109
Availability
Sold
Size
16 x 13 x 9 cm - Cabinet 
Formula
A(D3)G6(T6O18)(BO3)3X3Z (RRUFF)
Locality
Blue Bird mine, Colorado dist., Jefferson Co., Montana, United States
Tagged
ore specimen

This is a large, heavy specimen of brecciated andesite flooded with black tourmaline during the mineralization. It is sawed and polishd on one side. It is fascinating to look at all the different angular clasts which range in size from 2 to 60mm. Sulfides can be seen replacing some of the clasts and as fine disseminations and thin 1mm or less veinlets. 

The Blue Bird was mined for Silver, but also produced gold, copper, lead, zinc and antimony from 1887 to 1957. 

Tourmaline

Formula
Ca,Na,K[(Al,Fe2+,Fe3+,Li,Mg2+,Mn2+)3](Al,Cr3+,Fe3+,V3+)6(Si6O18)(BO3)3(O,OH)3(F,O,OH) 
Crystal System
Trigonal 
Fracture
Irregular/Uneven-Conchoidal 
Hardness

Data courtesy of Webmineral.

Collection
Chris van Laer Collection

All photos by Dakota Matrix and are Copyrighted © and may not be used without permission. Copyright © 2023 - Dakota Matrix Minerals, Inc. Privacy | Terms & Conditions | Site Map