Weight (Specific Gravity): Moderately High – Ranges from 3.96 to 3.98. It has a noticeable “heft” compared to common quartz or calcite, but is not as extreme as lead-based minerals like Cerussite.
Treatment: Celestite is generally not treated. Its color is typically natural. Low-quality or pale material is occasionally dyed a more intense blue to imitate finer specimens. Synthetic celestite exists for industrial purposes but is uncommon in the gem and collector market.
Body (Clarity/Transparency): Celestite ranges from transparent to translucent. Fine gem-quality crystals are transparent. Its most critical gemological flaw is perfect cleavage in one direction, making it incredibly fragile to cut or wear. Crystals are often included or fractured. Its tenacity is brittle.
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