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Yogo sapphire
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Yogo sapphires are blue sapphires, a colored variety of corundum, found in the US state of Montana, primarily in Yogo Gulch in Judith Basin County. Yogo sapphires are typically cornflower blue, a resu
A 0.65-carat (0.130 g) cornflower blue Yogo sapphire
A 0.65-carat (0.130 g) cornflower blue Yogo sapphire
A 0.43-carat (0.086 g) teardrop-shaped cornflower blue Yogo sapphire
A 0.43-carat (0.086 g) teardrop-shaped cornflower blue Yogo sapphire
A 0.37-carat (0.074 g) brilliant cut purple Yogo sapphire. Only about two percent of Yogo sapphires are purple.
A 0.37-carat (0.074 g) brilliant cut purple Yogo sapphire. Only about two percent of Yogo sapphires are purple.
An uncut/rough yellow sapphire found at the Spokane Sapphire Mine near Helena, Montana
An uncut/rough yellow sapphire found at the Spokane Sapphire Mine near Helena, Montana
Corundum
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Corundum is a crystalline form of aluminium oxide typically containing traces of iron, titanium, vanadium, and chromium. It is a rock-forming mineral. It is a naturally transparent material, but can h
Yogo sapphire
…Yogo sapphires are blue sapphires, a colored variety of corundum, found in the US state of Montana, primarily in Yogo Gulch (part of the Little Belt Mountains) in Judith Basin County. Yogo sapphires are typically…
Several corundum crystals
Several corundum crystals
Corundum from Brazil, size about 2 cm × 3 cm (0.8 in × 1 in)
Corundum from Brazil, size about 2 cm × 3 cm (0.8 in × 1 in)