Meionite
Mineral Ca4Al6Si6O24CO3
Also called Scapolite and Wernerite
About it
The calcium-carbonate scapolite, in square prisms in marble and skarn; Ontario and Quebec's Grenville marbles give fluorescent crystals. First described from Monte Somma, Italy.
- Type
- Mineral
- Group
- Silicate (tectosilicate), scapolite group
- Formula
- Ca4Al6Si6O24CO3
- Hardness (Mohs)
- 5–6
- Specific gravity
- 2.74–2.78
- Streak
- white
- Lustre
- vitreous (glassy), pearly, resinous
- Crystal system
- Tetragonal
- Colours
- colourless, white, grey, pink, violet, yellow
- Transparency
- transparent, translucent
- Cleavage and fracture
- distinct prismatic in two directions
- Under UV light
- often yellow or orange under longwave UV
Typical values: real specimens vary. For more, see mindat.org.