Marialite
Mineral Na4Al3Si9O24Cl
Also called Scapolite and Wernerite
About it
The sodium-chlorine scapolite: square prisms with a fibrous look along their length. Yellow and violet gem scapolite from Tanzania and Madagascar is mostly marialite.
- Type
- Mineral
- Group
- Silicate (tectosilicate), scapolite group
- Formula
- Na4Al3Si9O24Cl
- Hardness (Mohs)
- 5.5–6
- Specific gravity
- 2.5–2.62
- Streak
- white
- Lustre
- vitreous (glassy), pearly, resinous
- Crystal system
- Tetragonal
- Colours
- colourless, white, yellow, pink, violet, blue, grey
- 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.