Barytrs, Heaveyspar =BaSO4

witherite=BaSO3

Barium is an element which does not occur in pure (native) form on Earth. The two most common minerals in which barium occurs are Barite (BaSO4) and Witherite (BaCO3). According to its entry on wikipedia, Barite has Perfect cleavage parallel to base and prism faces: {001} Perfect, {210} Perfect, {010} Imperfect. I am unsure what sort of cleavage Witherite has.

Barium is not a mineral, but is a chemical element. Barium, an alkaline metal, is quite reactive, and it is never found free in nature. Rather, it forms compounds that make up some minerals like barite, which is barium sulfate, and witherite, which is barium carbonate.

Barium oxide is formed from barium and oxygen.

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 7 words with the pattern ---HE--T-. That is, nine letter words with 4th letter H and 5th letter E and 8th letter T. In alphabetical order, they are:

cachepots

disherits

ditheists

dithelete

hyphenate

nephelite

witherite