Ludlamite
Mineral Fe2+3(PO4)2·4H2O
About it
Bright apple-green tablets of iron phosphate, prized from Bolivian tin mines such as Huanuni and from the Blackbird mine in Idaho. Named for English collector Henry Ludlam.
- Type
- Mineral
- Group
- Phosphate
- Formula
- Fe2+3(PO4)2·4H2O
- Hardness (Mohs)
- 3.5
- Specific gravity
- 3.12–3.19
- Streak
- greenish white
- Lustre
- vitreous (glassy)
- Crystal system
- Monoclinic
- Colours
- apple green, bright green, colourless
- Transparency
- transparent, translucent
- Cleavage and fracture
- perfect in one direction
Typical values: real specimens vary. For more, see mindat.org.