...Gilberto Artioli; Romano Rinaldi; Kenny Stahl; Pier Francesco Zanazzi Abstract The crystal structure of beryl has been refined from single-crystal neutron and X-ray data obtained on two samples with different alkali and H 2 O contents [morganite: Al 2 Be 2.65 Li 0.32 Si 6 O 18 ·(Na 0.22 Cs 0.08...

...APPENDIX TABLE A6. MORGANITE SAMPLE INFORMATION ...

... to 1.08 atoms per half unit cell. A close relationship has been established between occurrences of gemstones and clay minerals. Some important textures and crystal chemistry are discussed. The main gemstones related to the Namacotche Pegmatite are: morganite (pink cesian beryl), kunzite (spodumene...

... than in Figure 1 . The high field sextet from Mn 2+ impurities can be seen at the right end of the spectrum. The EPR spectra of the morganite crystals show a strong Mn 2+ signal, but there is no trace of the octahedral Fe 3+ signal. In many spectra, there is also an asymmetric central line...

...), and in the southern Africa (Zimbabwe), which are the source of sheet muscovite, sorting beryl, gem-quality morganite, and tourmaline. Though rarely, miaroles occur in the muscovite pegmatites, e.g., in the Mama province (Russia), in Brazil, and in the USA. Of course, the classification scheme will be adequate...

... B eryl (ideally Be 3 Al 2 Si 6 O 18 ) is a mineral with a remarkable set of gemmological varieties: goshenite (colourless to white), aquamarine (blue), emerald (green), heliodor (golden yellow), morganite (pink) and bixbyite (a rare red variety). Originally determined in 1926, the crystal...

... chapter, Turner and Groat consider the non-emerald gem beryls – aquamarine and other varieties of beryl, such as morganite, heliodor and red beryl, as well as the more recently discovered pezzottaite and stoppaniite. The True Blue aquamarine occurrence in the Yukon is described as an example of gem beryl...

... is an elegant presentation by twenty-two authors on colorful varieties of beryl (including the varieties aquamarine, red beryl, morganite, emerald, goshenite and heliodor, in addition to the cyclosilicate species foursome noted above. Packed into the first 104 pages are contributions (the titles of which...

... WAS an unconventional thinker! My thanks would be totally inadequate without acknowledging my wife, Beryl. For 54 years her unfailing love, support, and encouragement have grown proportionately from the value of the mineral after which she was named, through those of semiprecious morganite, then aquamarine...