Georgetown Mining District, Deer Lodge County, Montana, USA

Native gold in limonite. The gold probobly came from pyrite that decomposed to limonite. The field of view is .75mm. Photographed by Karl Volkman. Collected by and in the collection of Donald Volkman

© Karl Volkman 04/06

Another relatively unknown mineral, ludwigite (Mg2Fe3+BO5) typically forms in magnesian iron skarns and contact metamorphic deposits. It forms a series with vonsenite. In this large and rich specimen from the Pomeroy iron mine in Montana, it has formed bright black, radial fibrous aggregates. Old material and a rare Montana piece of some note. Ex. ...

© Rob Lavinsky & irocks.com

A mass of crystals up to 6mm across. Collected by, and in the collection of, Donald Volkman. Photographed by Karl Volkman.

© Karl Volkman 1/18/08

Groups of elongated arsenopyrite crystals to 1mm long on matrix. Etched out of a calcite vein. Photographed by Karl Volkman. In the collection of Donald Volkman.

© Karl Volkman 12/07

6.3 x 5.9 x 3.3 cm. A bright, richly burnished, 6 mm gold crystal cluster perched atop milky quartz from the much less well-known Atlantic Cable (Cable) Mine of Montana. This mine was located in 1866 and not mined for very long. Old, historic, seldom available material. Ex. Smithsonian Collection, with label.

© Rob Lavinsky & irocks.com

Dendritic crystallized native gold measuring to 0.35 cm in length are set on a 2.4 x 1.6 x 0.9 cm matrix. Ex Steve Pullman collection.

© Weinrich Minerals, Inc.

6.3 x 5.9 x 3.3 cm. A bright, richly burnished, 6 mm gold crystal cluster perched atop milky quartz from the much less well-known Atlantic Cable (Cable) Mine of Montana. This mine was located in 1866 and not mined for very long. Old, historic, seldom available material. Ex. Smithsonian Collection, with label.

© Rob Lavinsky & irocks.com

Dendritic crystallized native gold measuring to 0.35 cm in length are set on a 2.4 x 1.6 x 0.9 cm matrix. Ex Steve Pullman collection.

© Weinrich Minerals, Inc.

A vein section of dark red massive cuprite with malachite. 533 grams. Ex. Dave Shannon from Laszlo Dudas. Collected in the early 1960's.

© Daniel Evanich 2022

Arborescent growth of very well defined octahedral Gold crystals, which includes small fragments of Quartz matrix. Of the best quality for a mine that is not too well known and from which specimens are rarely seen. Atlantic Cable Mine, Georgetown Sub-district, Deer Lodge County, Montana, USA. Reference: EM96AL7

© Fabre Minerals - https://www.fabreminerals.com

Light green malachite tube structures forming closely interwoven web-like pattern on an orangish-brown limonite layer all on a black hematite matrix.

© Bill Hamel

Multiple shades of green fibrous malachite covering the surface of an opened cavity in limonite on massive cuprite. Ex. Dave Shannon from Laszlo Dudas. Collected in the early 1960's.

© Daniel Evanich 2022

Arborescent growth of very well defined octahedral Gold crystals, which includes small fragments of Quartz matrix. Of the best quality for a mine that is not too well known and from which specimens are rarely seen. Atlantic Cable Mine, Georgetown Sub-district, Deer Lodge County, Montana, USA. Specimen size: 2.6 × 1.5 × 1.5 cm = 1.02” × ...

© Fabre Minerals - https://www.fabreminerals.com

Black aggregate of acicular, radiating 1 cm Ludwigite needles and 5 mm aggregates of metallic Magnetite. This is a better photograph taken against a white background.