Borate Minerals and their features

The borate minerals are minerals which contain a borate (BO3) anion group. There are known over 100 different borate minerals.

Colemanite

Chemical Formula : Ca2B6O11·5H2O 

Mohs Scale : 4,5

Crystal System : Monoclinic

From Kütahya, Türkiye

Ulexite

Chemical Formula :  NaCaB5O6(OH)6·5H2O 

Mohs Scale : 2,5

Crystal System : Triclinic

From Kütahya, Türkiye

Colemanite & Realgar

From Kütahya, Türkiye

Ulexite & Celestine

Borax 

Chemical Formula :  Na2B4O5(OH)4·8H2O

Mohs Scale : 2 - 2.5

Crystal System : Monoclinic

Solubility : Solible in water

Melting/Boiling point : 743 C / 1575 C



Ulexite & Celestine


From Kütahya, Türkiye


Howlite

Chemical Formula :  Ca2B5SiO9(OH)5

Mohs Scale : 3.5

Crystal System : Monoclinic