What is structure of Borax: Tincal or Suhaga ?

The name borax is derived from the Persian word borak, meaning white. IUPAC name of borax is sodium tetraborate decahydrate (Na₂B₄O₇⋅10 H₂O ). Also note that, after analyzing its crystal structure, borax is more properly formulated as Na₂[B₄O₅(OH)₄]⋅8H₂O

Structure:

(1) It is also named as sodiumtetra borate decahydrate

(2) Common Indian name is Suhaga.

(3) Na₂B₄O₇. 5H₂O is known as Jeweller's Boran

(4) Na₂B₄O₇ is known as Boron glass

(5) It is also represent as Na₂O.2B₂O₃.10H₂O.

IIT UPDATE: (2016):