Yugawaralite
Mineral CaAl2Si6O16·4H2O
About it
Colourless, flattened glassy crystals in altered volcanic rock, named for Yugawara hot spring in Japan; large crystals also come from Chena Hot Springs, Alaska, and Iceland.
- Type
- Mineral
- Group
- Silicate (tectosilicate), zeolite group
- Formula
- CaAl2Si6O16·4H2O
- Hardness (Mohs)
- 4.5–5
- Specific gravity
- 2.2–2.23
- Streak
- white
- Lustre
- vitreous (glassy), pearly
- Crystal system
- Monoclinic
- Colours
- colourless, white
- Transparency
- transparent
- Cleavage and fracture
- distinct in two directions
Typical values: real specimens vary. For more, see mindat.org.