1) Beautiful stone 2) Calcium mineral 3) Cut mineral 4) Decorative stone 5) Gemstone mineral 6) Gemstone 7) Jewel mineral 8) Jewel 9) Meteorite mineral 10) Mineral gemstone 11) Mineral jewel 12) Polished mineral 13) Polished jewel 14) Precious jewel 15) Prized mineral 16) Precious gemstone 17) Precious gem
Found on
https://www.crosswordclues.com/clue/hibonite
Hibonite ((Ca,Ce)(Al,Ti,Mg)12O19) is a brownish black mineral with a hardness of 7.5-8.0 and a hexagonal crystal structure. It is rare, but is found in high-grade metamorphic rocks on Madagascar. Some presolar grains in primitive meteorites consist of hibonite. Hibonite also is a common mineral in the Ca-Al-rich inclusions (CAIs) found in some cho...
Found on
http://en.wikipedia.org/wiki/Hibonite
(from the article `meteorite`) ...7,000 to 1. Types of minerals of circumstellar origin that have been isolated from chondrites include diamond, graphite, silicon carbide, silicon ...
Found on
http://www.britannica.com/eb/a-z/h/46
No exact match found.
