By Tony Hisgett from Birmingham, UK (BayldoniteUploaded by tm) [CC-BY-2.0], via Wikimedia Commons
Bayldonite is a nondescript greenish material that has been cut into cabochons by enterprising collectors of the unusual. Cut bayldonites are a rarity, nonetheless, and are seldom seen in collections. The luster of cabochons is sometimes almost metallic and provides a curious appearance to the cut stones. Bayldonite provides a curious appearance to the cut stones. Bayldonite is compact but too soft for rings; it could be worm in bola ties and pendants.
Bayldonite Value
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Bayldonite Information
| Data | Value |
| Name | Bayldonite |
| Crystallography | Monoclinic. Fibrous concretions; massive, granular. |
| Colors | Various shades of yellowish green. |
| Luster | Resinous. |
| Hardness | 4.5 |
| Density | 5.5 |
| Birefringence | 0.004 |
| Cleavage | Not observed |
| Dispersion | No data. |
| Stone Sizes | Cabochons only for massive, fibrous material from Tsumeb. |
| Luminescence | None |
| Spectral | Not diagnostic |
| Formula | (Pb, Cu)3 (AsO4)2(OH)2 |
| Pleochroism | No data. |
OPTICS: α= 1.95; β = 1.97 γ = 1.99
Biaxial (+), 2V large
OCCURRENCE: Secondary mineral in Pb-Cu deposits.
England; France.
Tsumeb, Namibia: only major occurrence
COMMENTS: Bayldonite is a nondescript greenish material that has been cut into cabochons by enterprising collectors of the unusual. Cut bayldonites are a rarity, nonetheless, and are seldom seen in collections. The luster of cabochons is sometimes almost metallic and provides a curious appearance to the cut stones. Bayldonite provides a curious appearance to the cut stones. Bayldonite is compact but too soft for rings; it could be worm in bola ties and pendants.
NAME: After Mr. John Bayldon.
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