: Data on refractive indices, optic axial angles, and density, often correlated with chemical composition.
: Specialist coverage of sapphirine and aenigmatite. Report Structure Rock-forming minerals, Volume 2,Deel 1
: The second edition was completely rewritten to include over 15 years of new research, growing to 668 pages (three times the length of the first edition). : Data on refractive indices, optic axial angles,
: Each chapter begins with a data summary and a sketch showing optical orientation or stereographic projections. : Data on refractive indices