Fairfieldite
Mineral Ca2Mn2+(PO4)2·2H2O
About it
White to pale yellow, pearly bladed or fibrous aggregates in phosphate-rich granite pegmatites. Named for Fairfield County, Connecticut, where it was found at Branchville.
- Type
- Mineral
- Group
- Phosphate, fairfieldite group
- Formula
- Ca2Mn2+(PO4)2·2H2O
- Hardness (Mohs)
- 3.5
- Specific gravity
- 3.07–3.1
- Streak
- white
- Lustre
- pearly, vitreous (glassy)
- Crystal system
- Triclinic
- Colours
- colourless, white, pale yellow, greenish white
- Transparency
- transparent, translucent
- Cleavage and fracture
- perfect in one direction
Typical values: real specimens vary. For more, see mindat.org.