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PhotosMagnesite - Mount Brussilof mine, Radium Hot Springs, Golden Mining Division, British Columbia, Canada

7th Apr 2016 15:57 UTCRichard Gunter Expert

Magnesite, Sphalerite, Galena

Mount Brussilof mine (Bay Mag Mine), Radium Hot Springs, Golden Mining Division, British Columbia, Canada

This looks more like a Dolomite crystal than a Magnesite. Is it possible to have a side view of the blade to see if it is twinned?

7th Apr 2016 16:11 UTCRob Woodside 🌟 Manager

The hillocky surface is reminiscent of magnesite, the hexagonal outline suggests dolomite. However the dolomite was quite smooth and not "hillocky"

7th Apr 2016 16:15 UTCRichard Gunter Expert

Hi Rob:

I agree; the hexagonal outline was why I asked. Magnesite is not twinned from here that I know of but most of the flattened Dolomite shows some twinning.

7th Apr 2016 16:18 UTCRob Woodside 🌟 Manager

message sent

8th Apr 2016 02:39 UTCChristopher O'Neill

All,

Here are some additional photos that may help. It is wedge shaped like an ax.

It is also fluorescent pale orange red in short, mid and long wave UV - similar to Brumado, Bahia, Brazil.

8th Apr 2016 02:46 UTCReiner Mielke Expert

Test with HCl. Magnesite will not dissolve in cold HCl but dolomite will. Use a known piece of dolomite as a standard.

8th Apr 2016 03:13 UTCChristopher O'Neill

Reiner,

Don't have HCl - does the dolomite from this locality have similar or any red fluorescence?

Chris

8th Apr 2016 14:01 UTCReiner Mielke Expert

You can buy HCl in most hardware stores or pool supply stores it is usually called muriatic acid.

8th Apr 2016 17:37 UTCRichard Gunter Expert

Hi Christopher:

UV response at Mt. Brussilof is localized and may possibly be due to heavy metal contamination. My sample of Dolomite associated with Pyrite-Svanbergite-Fersmite fluoresces a weak yellow in SW UV but the Dolomite and Magnesite samples from non-heavy metal bearing portions of the deposit do not have any fluorescence.