Adamite
Mineral Zn2(AsO4)(OH)
Take care.
- Contains arsenic: Wash your hands after handling it, don't make dust, and never heat it.
About it
Bright yellow to lime-green sprays and crystals on limonite that glow vivid green under UV; copper makes it greener and cobalt makes it violet. A classic from the Ojuela mine at Mapimí, Mexico.
- Type
- Mineral
- Group
- Arsenate, olivenite group
- Formula
- Zn2(AsO4)(OH)
- Hardness (Mohs)
- 3.5
- Specific gravity
- 4.32–4.48
- Streak
- white to pale green
- Lustre
- vitreous (glassy)
- Crystal system
- Orthorhombic
- Colours
- yellow, yellow-green, colourless, violet, pink, green
- Transparency
- transparent, translucent
- Cleavage and fracture
- good in one direction; uneven to subconchoidal fracture
- Under UV light
- bright green under longwave and shortwave UV
Typical values: real specimens vary. For more, see mindat.org.