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PhotosRutile - Monte Lake, Kamloops Mining Division, British Columbia, Canada

8th Jan 2015 15:25 UTCRichard Gunter Expert

Goethite, Quartz

Monte Lake, Kamloops Mining Division, British Columbia, Canada

I would be wary this was not Goethite. Has it been tested?

8th Jan 2015 15:51 UTCUwe Kolitsch Manager

I agree, message sent.

8th Jan 2015 19:24 UTCTony Peterson Expert

Not been tested but that can be arranged. Can anyone point me to a goethite specimen that resembles this?

Tony

8th Jan 2015 19:45 UTCReiner Mielke Expert

How about this one? http://www.mindat.org/photo-46896.html

8th Jan 2015 21:26 UTCRichard Gunter Expert

Goethite, Quartz

Walker Valley, Skagit County, Washington, USA

Or this one?

8th Jan 2015 21:46 UTCTony Peterson Expert

Yes, those are convincing. I will make a note in the caption and arrange for analysis.

Richard, the caption for your image indicates a very small FOV: what is it?

thanks,

Tony

8th Jan 2015 23:05 UTCRichard Gunter Expert

Hi Tony:

I borrowed that image from the Walker Valley, Washington locality. Have a look at the Goethite from there for several more sample and the FOV for that photo. My Goethite on Amethyst from there would require a microscope to see and is too small for my photographic equipment.

9th Jan 2015 00:24 UTCReiner Mielke Expert

Tony,

If you can get off one crystal and put it in oxalic acid that should tell you which it is. Rutile is insoluble whereas geothite is slowly soluble.

9th Jan 2015 06:36 UTCMarek Chorazewicz

Gentlemen,

I've seen those little brushes too on a few quartz samples I've found at the Monte Lake roadcut. I assumed it was goethite based on John Ratcliffe's Canadian Rockhound 1999 article about Kamloops zeolites. He did not mention rutile from there.

Best Regards,

MarekC