Tugtupite
Mineral Na4AlBeSi4O12Cl
Also called Reindeer stone
About it
Pink to crimson massive material from Greenland's Ilímaussaq complex that deepens in colour under UV or sunlight and fades in the dark. Glows vivid red under UV.
- Type
- Mineral
- Group
- Silicate (tectosilicate), sodalite group
- Formula
- Na4AlBeSi4O12Cl
- Hardness (Mohs)
- 4–6.5
- Specific gravity
- 2.33–2.36
- Streak
- white
- Lustre
- vitreous (glassy)
- Crystal system
- Tetragonal
- Colours
- pink, crimson, red, white, bluish
- Transparency
- transparent, translucent
- Cleavage and fracture
- distinct; uneven fracture
- Under UV light
- bright red under shortwave and longwave UV
Typical values: real specimens vary. For more, see mindat.org.