Barylite
Mineral BaBe2Si2O7
About it
Heavy, colourless to white barium-beryllium silicate sought by fluorescent collectors at Franklin, New Jersey; also from Långban, Sweden, and fine crystals from Colorado.
- Type
- Mineral
- Group
- Silicate (sorosilicate)
- Formula
- BaBe2Si2O7
- Hardness (Mohs)
- 7
- Specific gravity
- 4–4.1
- Streak
- white
- Lustre
- vitreous (glassy), greasy
- Crystal system
- Orthorhombic
- Colours
- colourless, white, blue
- Transparency
- transparent, translucent
- Cleavage and fracture
- good in two directions
- Under UV light
- often blue to violet under shortwave UV
Typical values: real specimens vary. For more, see mindat.org.