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Blue Spinel from Afghanistan. Most blue spinel is rather opaque and not very intensely colored, but these crystals from Afghanistan are...gemmy, fairly well-formed, and cobalt blue... ..z

moqui marbles, utah Iron oxide concretions (Moqui marbles) Moqui Marbles, hematite concretions, from the Navajo Sandstone of southeast Utah. Scale cube, with "W", is one centimeter square. The Navajo Sandstone is also well known among rockhounds for its hundreds of thousands of iron oxide concretions

from Etsy

Solid Detroit Agate / Fordite Cabochon Early 1960's Material (suzybones)