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Corundum

Yogo Gulch, Yogo District, Little Belt Mountains, Judith Basin County, Montana, USA

RRUFF Project Specimen ID: R060020Locality: Yogo Gulch, Montana, USASource: American Museum of Natural History 98807 Water rounded light blue fragment

Corundum (Var: Sapphire)

Yogo Gulch, Yogo District, Little Belt Mountains, Judith Basin County, Montana, USA

0.7x0.6x0.2 cm

Corundum (Var: Sapphire)

Yogo Gulch, Yogo District, Little Belt Mountains, Judith Basin County, Montana, USA

0.8 x 0.8 x 0.1 cm. A rarely seen, fairly sharp, euhedral, blue/purple, flattened hexagonal crystal of Sapphire from the famous gem gravels of Montana. This crystal has good gemminess and color for the locality, and was personally collected by Richard Kosnar on a trip to Montana in 1979. The piece might possibly be a twin as it appears to have a ...

Corundum

Yogo Gulch, Yogo District, Little Belt Mountains, Judith Basin County, Montana, USA

2.7 x 1.1 x 0.8 cm. This is a rare Montana corundum (sapphire) crystal. This is not a flat/compressed "disc" either, bur rather a robust, prismatic hexagonal crystal. It's not gem quality or brightly colored, but it does have a blue-grey hue on the exterior.

Aragonite

Yogo Gulch, Yogo District, Little Belt Mountains, Judith Basin County, Montana, USA

12.7 x 8.2 x 4.3 cmThis piece came to us with a hand-written label stating that it was from the Yogo Mine in Montana. I don't know specifically it was found directly at the Yogo Sapphire Mine, or someplace nearby. Calcite has been reported from Yogo Gulch, so it stands to reason that aragonite could be found there as well. It honestly looks ...

Aragonite

Yogo Gulch, Yogo District, Little Belt Mountains, Judith Basin County, Montana, USA

12.7 x 8.2 x 4.3 cmThis piece came to us with a hand-written label stating that it was from the Yogo Mine in Montana. I don't know specifically it was found directly at the Yogo Sapphire Mine, or someplace nearby. Calcite has been reported from Yogo Gulch, so it stands to reason that aragonite could be found there as well. It honestly looks ...

Aragonite

Yogo Gulch, Yogo District, Little Belt Mountains, Judith Basin County, Montana, USA

12.7 x 8.2 x 4.3 cmThis piece came to us with a hand-written label stating that it was from the Yogo Mine in Montana. I don't know specifically it was found directly at the Yogo Sapphire Mine, or someplace nearby. Calcite has been reported from Yogo Gulch, so it stands to reason that aragonite could be found there as well. It honestly looks ...

Aragonite

Yogo Gulch, Yogo District, Little Belt Mountains, Judith Basin County, Montana, USA

12.7 x 8.2 x 4.3 cmThis piece came to us with a hand-written label stating that it was from the Yogo Mine in Montana. I don't know specifically it was found directly at the Yogo Sapphire Mine, or someplace nearby. Calcite has been reported from Yogo Gulch, so it stands to reason that aragonite could be found there as well. It honestly looks ...

Hematite, Pyrite

Yogo Gulch, Yogo District, Little Belt Mountains, Judith Basin County, Montana, USA

A cluster of several cubic Pyrite crystals is completely replaced by red-brown Hematite. Collected from the wash plant sluice during the period when Votex Mining was operating the Yogo Gulch claim.Personal collection of Sharon Cisneros.

Aragonite

Yogo Gulch, Yogo District, Little Belt Mountains, Judith Basin County, Montana, USA

12.7 x 8.2 x 4.3 cmThis piece came to us with a hand-written label stating that it was from the Yogo Mine in Montana. I don't know specifically it was found directly at the Yogo Sapphire Mine, or someplace nearby. Calcite has been reported from Yogo Gulch, so it stands to reason that aragonite could be found there as well. It honestly looks ...

Yogo Gulch, c. 1950

Yogo Gulch, Yogo District, Little Belt Mountains, Judith Basin County, Montana, USA

East wall of Yogo Gulch as seen from the valley of Kelly Gulch. The cleft in the limestone cliff marks the fracture zone along which the sapphire-bearing dike was emplaced. Source: Clabaugh, S.E., Corundum Deposits of Montana (1952) USGS Bulletin 983, Fig. 5.