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Bustamite

Posted by Ralph Bottrill  
avatar Bustamite
December 28, 2009 09:22AM
Click here to view Best Minerals B and here for Best Minerals A to Z and here for Fast Navigation of completed Best Minerals articles.


Can you help make this a better article? What good localities have we missed? Can you supply pictures of better specimens than those we show here? Can you give us more and better information about the specimens from these localities? Can you supply better geological or historical information on these localities?


Bustamite
CaMn2+Si2O6 triclinic

Bustamite 6.2cm Broken Hill, New South Wales, Australia© Rob Lavinsky


A pyroxenoid, related to rhodonite and ferrobustamite. A relatively uncommon mineral found in some metamorphosed manganese deposits, usually massive, and an occaisional lapidary material. The best specimens have arguably come from either the Broken Hill or Franklin mines, but few come out from either area these days.


Australia
New South Wales, Yancowinna Co., Broken Hill

Bustamite 4cm tall© Rob Lavinsky


Bustamite has been found in several mines in the Broken Hill district, most notably the North mine, but also the ZC and NBHC mines (see below). It is not always easy to confirm the precise provenance however. Specimens were locally abundant and in good large crystals. Most specimens came out in the 1960's and 70's; they are now becoming rare. Most occured as somewhat rounded, pink to brown prismatic crystals in calcite with hedenbergite, galena and sphalerite. Some was quite fibrous, and pale pink to white in colour, in late stage vughs.


Australia
New South Wales, Yancowinna Co., Broken Hill, North Mine (North Broken Hill Mine; NBH Mine)

Bustamite FOV 3cm wide© Greg Murray
Bustamite ~6cm wide©


Australia
New South Wales, Yancowinna Co., Broken Hill, Zinc Corporation Mine (ZC Mine; NBHC Mine)

1.3 cm Bustamite xl on Galena© Knut Eldjarn
Bustamite 10cm wide©


Japan
Honshu Island, Kanto Region, Tochigi Prefecture, Kanuma

Bustamite ~2.5cm tall©



South Africa
Northern Cape Province, Kalahari manganese fields, Hotazel, Wessels Mine (Wessel's Mine)

Bustamite 9.4cm tall© Rob Lavinsky


Bustamite is fairly uncommon for the Kalahari district, but some massive pink material was suitable for lapidary purposes.


United Kingdom
England, Devon, Okehampton area (Northern Dartmoor), Meldon Quarry (British Rail Quarry; British Railways Quarry; B. R. Quarry)

Bustamite 9cm wide© Ian Jones



USA
New Jersey, Sussex Co., Franklin Mining District, Franklin, Franklin Mine

Bustamite 20cm wide© 2003 John H. Betts
Bustamite crystal 8cm tall© Martins da Pedra


This is the type locality, and produced some of the best specimens (arguably equal to those from Broken Hill).



Click here to view Best Minerals B and here for Best Minerals A to Z and here for Fast Navigation of completed Best Minerals articles.

Regards,
Ralph



Edited 6 time(s). Last edit at 08/06/2010 01:51PM by Rock Currier.
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