Römerite
Mineral Fe2+Fe3+2(SO4)4·14H2O
Also called Roemerite
Take care.
- Damaged by water: Keep it dry: don't wash it, and keep it out of damp places.
- Breaks down in damp air: Keep it dry and in steady humidity; some crumble or rot as they take on moisture.
About it
Rust-brown to yellow-brown granular crusts and small crystals formed where pyrite oxidizes in dry climates, often with copiapite. Soluble in water; named for German geologist Friedrich Römer.
- Type
- Mineral
- Group
- Sulfate, hydrated
- Formula
- Fe2+Fe3+2(SO4)4·14H2O
- Hardness (Mohs)
- 3–3.5
- Specific gravity
- 2.15–2.17
- Streak
- pale yellowish
- Lustre
- vitreous (glassy), resinous
- Crystal system
- Triclinic
- Colours
- rust brown, yellowish brown, violet-brown
- Transparency
- transparent, translucent
- Cleavage and fracture
- perfect in one direction
Typical values: real specimens vary. For more, see mindat.org.