Sassolite

Sassolite is a borate mineral, and is the mineral form of boric acid. It occurs in volcanic fumaroles and hot springs, as well as in bedded sedimentary borate deposits. Its mineral form was first noted in the early 19th century, and was named after Sasso, Italy, where it was found. Usually coloured white to gray, it is colourless in transmitted light, and can also take on a yellow colour from sulfur impurities, or brown from iron oxides.
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General Information:
 Chemical Formula:
H3BO3
 Composition:
(Molecular Weight = 27.82 gm)
Boron 38.86 % B 
Hydrogen 3.62 % H 
Oxygen 57.52 % O 
 Empirical Formula:
B(OH)
 Environment:
Volcanic fumaroles and hot springs.
 Locality:
Sasso and the Tuscan lagoons, between Volterra and Massa Marittima, Italy.
 Name Origin:
Named after its locality.
Physical Properties:
 Cleavage:
[001] Perfect
 Color:
white, gray, yellow, or brown.
 Density:
3.3 - 3.5, Average = 3.4
 Diaphaniety:
Transparent
 Habits:
Platy - Sheet forms (e.g. micas)., Encrustations - Forms crust-like aggregates on matrix., Tabular - Form dimensions are thin in one direction.
 Hardness:
1 - Talc
 Luminescence:
Fluorescent.
 Luster:
Vitreous - Pearly
 Streak:
white
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B: (Kimia) sasolit
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