Cancrinite
Mineral Na6Ca2Al6Si6O24(CO3)2
About it
Yellow to orange masses with nepheline and sodalite in syenite; it fizzes in acid because of its carbonate. Bancroft, Ontario, and the Ilmen Mountains, Russia.
- Type
- Mineral
- Group
- Silicate (tectosilicate), cancrinite group
- Formula
- Na6Ca2Al6Si6O24(CO3)2
- Hardness (Mohs)
- 5–6
- Specific gravity
- 2.42–2.51
- Streak
- white
- Lustre
- vitreous (glassy), greasy, pearly
- Crystal system
- Hexagonal
- Colours
- yellow, orange, white, pink, blue, grey
- Transparency
- transparent, translucent
- Cleavage and fracture
- perfect prismatic
Typical values: real specimens vary. For more, see mindat.org.