Geco Mine, Gemmell Township, Thunder Bay District, Ontario, Canada

A couple of large cordierite crystals embedded in quartz. The crystals are gemmy on the inside and altered to chlorite on the outside. Specimen is 13.0cm across.

© David K. Joyce

The sample size is 3 cm x 2 cm These are coarse-grained euhedral Gahnite crystals in Quartz. The sample was purchased from Dr. George Robinson in 1979. The Canadian Mineralogist article has an average of 7 microprobe analyses of the Geco Mine Gahnite as: (Zn.41Mg.30Fe.28Mn.01)1.00Al1.99O4. This is close to the midpoint of the ...

8.7 x 8.7 x 5.7 cm. An exceptional pair of large cordierite crystals, with chalcopyrite, from this metamorphosed Cu-Zn mine in Ontario. The cordierites have a good, almost waxy, luster, and are actually glassy in the interior. One of the crystals is terminated, and both are set within metallic, iridescent, massive chalcopyrite. Crystals this large ...

© Rob Lavinsky & irocks.com

A specimen of glassy and in places transparent clean cordierite showing yellow dark blue dichroism when turned. X Tim Baker. Tim Baker was the sample man at the mine. The scale under the specimen is an inch with a rule at one cm.

© Rock Currier

A specimen of dark glassy gahnite with chalcopyrite and quartz. X Tim Bakker. According to Rock Currier, he was the sample man at the mine. The scale under the specimen is one inch on the left side of the mark and one centimeter on the right side of the mark. I found a town hall meeting from Manitouwadge, May 30, 1988: Female Narrator ...

© Craig Wilson

Blue cordierite crystal section, some parts are transparent/gemmy, with a few very tiny gahnite spinels (not visible on these photographs). Accompanied with handwritten note by dr Timothy Bakker (see label). Acquired in July-2024 (thank you Eric M.!)

© Mathauser

A light bubble gum pink coloured specimen of rhodonite with a tiny pocket of crystals. X Tim Bakker. According to Rock Currier, he was the sample man at the mine. The scale under the specimen is one inch on the left side of the mark and one centimeter on the right side of the mark. I found a town hall meeting from Manitouwadge, May 30, ...

© Craig Wilson

The Geco mine in 1975. The mine is probably of most interest to collectors for the gem grade Cordierite that it produced. I got a few specimens of gemmy material from a sample man who worked at the mine. More than 20 years later I was in Elco,Nevada attend an MSHAW safety training course so I could go collect under ground in an active mine that ...

© Rock Currier

One of the workings at the Geco mine. The Geco mine is a lead zinc mine. Of most interest to the collector is perhaps the gem quality Cordierite that the mine produced.

© Rock Currier

Welcome to the Geco Mine. The Geco mine is a lead zinc mine. Of most interest to the collector is perhaps the gem quality Cordierite that the mine produced.

© Rock Currier

Part of the mill at the Geco mine. The Geco mine is a lead zinc mine. Of most interest to the collector is perhaps the gem quality Cordierite that the mine produced.

© Rock Currier

A lake near the Geco Mine. The Geco mine is a lead zinc mine. Of most interest to the collector is perhaps the gem quality Cordierite that the mine produced.

© Rock Currier

The lead-zinc-silver mine of the Geco Mines Limited, ca. 1965. The shaft head-frame (at right) is 222 feet high. One of the highest buildings in Northern Canada. Vintage picture postcard, published by Alex Wilson Publications Ltd., Dryden, Ontario. The card was sent on 23 August 1969 from Manitouwadge to St. George, Ontario. G. Grundmann ...

© Alex Wilson Publications Ltd., Dryden, Ontario.

A handwritten (by blue pen) note by dr Timothy Bakker, accompanying the cordierite: "Cordierite from our Noranda Mine (Geco Division) here at Manitouwadge where I am employed. Crystals are rare but are usually are large and broken as a result of mining." Below is written, lightly, in pencil: "Ontario". Sadly, I do not know if was written by ...

© Mathauser

A light bubble gum pink coloured specimen of rhodonite with a tiny pocket of crystals. X Tim Bakker. According to Rock Currier, he was the sample man at the mine. The scale under the specimen is an inch with a score at one cm. I found a town hall meeting from Manitouwadge, May 30, 1988: Female Narrator says "Tim Baker, once a horticulturist ...

© Craig Wilson

A specimen of dark glassy gahnite with chalcopyrite and quartz. X Tim Bakker. According to Rock Currier, he was the sample man at the mine. The scale under the specimen is an inch with a score at one cm. I found a town hall meeting from Manitouwadge, May 30, 1988: Female Narrator says "Tim Baker, once a horticulturist in Holland, now a ...

© Craig Wilson