
1) Beautiful stone 2) Cut mineral 3) Decorative stone 4) Gemstone 5) Gemstone mineral 6) Jewel 7) Jewel mineral 8) Mineral jewel 9) Mineral gemstone 10) Polished mineral 11) Polished jewel 12) Prized stone 13) Prized mineral 14) Precious stone 15) Precious gemstone 16) Precious jewel 17) Precious gem
Found on
https://www.crosswordclues.com/clue/brookite

Brookite is orthorhombic, and one of the four naturally occurring polymorphs (minerals with the same composition but different structure) of titanium dioxide, TiO2, approved by the International Mineralogical Association (IMA). The others are akaogiite (monoclinic), anatase (tetragonal) and rutile (tetragonal). Brookite is rare compared to anatase...
Found on
http://en.wikipedia.org/wiki/Brookite

• (n.) A mineral consisting of titanic oxide, and hence identical with rutile and octahedrite in composition, but crystallizing in the orthorhombic system.
Found on
http://thinkexist.com/dictionary/meaning/brookite/

one of three minerals composed of titanium dioxide (TiO2) (see also rutile; anatase). It typically occurs as brown, metallic crystals in veins in ...
Found on
http://www.britannica.com/eb/a-z/b/117
Brook'ite noun [ Named from the English mineralogist, H. J.
Brooke .]
(Min.) A mineral consisting of titanic oxide, and hence identical with rutile and octahedrite in composition, but crystallizing in the orthorhombic system.
Found on
http://www.encyclo.co.uk/webster/B/104

Brookite, named after the English mineralogist, H J Brooke, is a source of titanium but deposits are usually too small to be of commercial use. It has the formulae TiO2 and a relative hardness of 6.
Found on
http://www.probertencyclopaedia.com/browse/HB.HTM

Titanium oxide, di-
Found on
http://www.translationdirectory.com/glossaries/glossary075.htm
(Titanium Oxide) Brookite is a polymorph with two other minerals. The minerals rutile and anatase as well as brookite all have the same chemistry, TiO 2 , but they have different structures. At higher temperatures, about 750 degrees Celsius, brookite will automatically revert to the rutile structure. Rutile is the more com...
Found on
https://www.encyclo.co.uk/local/23719

a brown, red, or black mineral, titanium dioxide, TiO, trimorphous with rutile and anatase.
Found on
https://www.infoplease.com/dictionary/brookite
No exact match found.