1) Calcium mineral 2) Halide mineral 3) Trigonal mineral
Found on
https://www.crosswordclues.com/clue/tachyhydrite
Tachyhydrite is an unstable mineral, a hydrous chloride of calcium and magnesium with formula: CaMg2Cl6·12H2O. It is a rare component of marine evaporite salt deposits. Upon exposure to moist air it rapidly deliquesces and dissolves. It forms a colorless to yellow trigonal crystal with a vitreous luster. It is soft with a Mohs hardness of 2 and h...
Found on
http://en.wikipedia.org/wiki/Tachyhydrite
No exact match found.
