Sassolite
Mineral B(OH)3
Take care.
- Damaged by water: Keep it dry: don't wash it, and keep it out of damp places.
About it
Soft, pearly flakes and crusts of natural boric acid, greasy to the touch, around hot springs and volcanic vents. Named for Sasso Pisano in Tuscany, Italy, where it forms in the fumarole fields.
- Type
- Mineral
- Group
- Borate
- Formula
- B(OH)3
- Hardness (Mohs)
- 1
- Specific gravity
- 1.46–1.5
- Streak
- white
- Lustre
- pearly, vitreous (glassy)
- Crystal system
- Triclinic
- Colours
- colourless, white, grey, yellowish
- Transparency
- transparent, translucent
- Cleavage and fracture
- perfect basal; greasy feel
Typical values: real specimens vary. For more, see mindat.org.