Synonym: Mohavite.
Name: from "tincal", a Sanskrit name for borax, plus Greek κουία, "konis", powder.
Clades:
Nesoborates;
Borates.
Chemical: Na2(B4O7)·5H2O; Na2[B4O5(OH)4]·3H2O.
Colour: white, colourless.
Lustre: vitreous, dull.
Hardness: 2; pulverulent.
Specific
Gravity: 1.88.
Crystal System: Trigonal.