Bayldonite
Bayldonite is a rare copper-lead arsenate mineral known for its green to bluish-green color. It is primarily a collector’s mineral due to its rarity and composition, rather than a gemstone used in jewelry.
About
Bayldonite
Bayldonite is a rare mineral composed of copper, lead, and arsenate, with the chemical formula PbCu₃(AsO₄)₂(OH)₂. It belongs to the arsenate mineral group and crystallizes in the monoclinic crystal system. The mineral was first discovered in England and is named after John Bayldon, an English metallurgist. Bayldonite is typically found in shades of green, bluish-green, or yellowish-green. Its color is mainly due to the presence of copper within its structure. The mineral usually occurs in massive or microcrystalline forms rather than well-formed crystals, although small crystals can sometimes be observed. It has a vitreous to resinous luster and is generally translucent to opaque.it relatively soft and prone to scratches. Its specific gravity ranges between 5.3 and 5.5, reflecting its heavy metal content, particularly lead.
Physical & Chemical Properties
| Name | Bayldonite |
|---|---|
| Scientific Name | Bayldonite |
| Mineral Group | Arsenate |
| Hardness (Mohs) | 4.5 – 5 |
| Color | Green, bluish-green, yellowish-green |
| Origin | England (type locality), Namibia, Morocco, USA, Germany |
| Chemical Formula | PbCu₃(AsO₄)₂(OH)₂ |
Quick Facts
| Crystal System | Monoclinic |
|---|---|
| Specific Gravity | 5.3 – 5.5 |
| Birthstone | NA |
| Refractive Index | 1.85 – 1.95 |
| Optical Character | Biaxial |
| Dispersion | Low |
| Major Sources | Green, bluish-green, yellowish-green |
| Treatments | Bayldonite is usually untreated |
| Price Range | $20 – $80 |
| Care Instructions | Avoid direct skin contact Handle with care Keep away from moisture and chemicals Store in a safe, dry place |