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Alum
2.2" Lab Grown Purple Violet Octahedral ALUM ...
$24.00$60.00
When grown in mineral-rich solutions under carefully controlled conditions, alum forms pristine, ast..
4.1" Green ALUM SharpGemmy Octahedral Crystal...
$24.00$60.00
The two large octahedral alum crystals on this piece are up to 2" across, and are gemmy and highly s..
4.4" ALUM Grass Green Octahedral Crystals to1...
$36.00$90.00
This specimen is a lab grown example of alum, in a vivid lime green color that is very eye catching...
4.8" Green ALUM Sharp Gemmy Octahedral Crysta...
$38.00$95.00
Here is a gorgeous specimen of lab-grown alum, with sharp skeletal crystals that are colored a highl..
5" Fruity Grape Purple-Violet ALUM Octahedral...
$50.00$125.00
The octahedral alum crystals on this piece are up to 1.8" across, and are clear and highly skeletali..