Brazilianite
Mineral NaAl3(PO4)2(OH)4
About it
Bright chartreuse to yellow-green, glassy crystals from granite pegmatites, sometimes cut as gems. First described from Minas Gerais in Brazil in the 1940s; also found at the Palermo mine in New Hampshire.
- Type
- Mineral
- Group
- Phosphate
- Formula
- NaAl3(PO4)2(OH)4
- Hardness (Mohs)
- 5.5
- Specific gravity
- 2.98–2.99
- Streak
- white
- Lustre
- vitreous (glassy)
- Crystal system
- Monoclinic
- Colours
- chartreuse, yellowish green, greenish yellow, yellow
- Transparency
- transparent, translucent
- Cleavage and fracture
- good in one direction; conchoidal fracture
Typical values: real specimens vary. For more, see mindat.org.