Ulexite

Name:
Ulexite
Detailed information:

Chemistry name:	cotton balls
M Formula:	NaCaB5O9•8H2O
Properties:
White color; silky luster. Mohs hardness 1–2.5, d 1.96. Usually found as rounded, loose-textured masses of fine crystals.
Occurrence:
Chile, Argentina, California, Nevada.
Use:
Source of borax.