Clinohedrite
Mineral CaZn(SiO4)·H2O
About it
Colourless to faintly purple crystals known almost only from Franklin, New Jersey, where fluorescent collectors seek it for its orange glow under shortwave UV.
- Type
- Mineral
- Group
- Silicate (nesosilicate)
- Formula
- CaZn(SiO4)·H2O
- Hardness (Mohs)
- 5.5
- Specific gravity
- 3.28–3.33
- Streak
- white
- Lustre
- vitreous (glassy)
- Crystal system
- Monoclinic
- Colours
- colourless, white, pale amethyst
- Transparency
- transparent, translucent
- Cleavage and fracture
- perfect in one direction
- Under UV light
- orange under shortwave UV
Typical values: real specimens vary. For more, see mindat.org.