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Out of Our Mines
“Red” Chrysoberyl versus Alexandrite: The Impact of Elevated Chromium Levels on Color and Color-Change Properties
Mineral Assemblage of “Paraíba Matrix”
A Useful Technique to Confirm the Hydrophane Nature of Opal
Observing a water drop’s interaction with opal, as well as refractive index, can confirm a specimen’s hydrophane nature with less risk of breakage than total immersion.
Blue Zircon Reportedly from Malawi
A reported new source of blue zircon in Malawi yields rough material for beautiful finished stones in the gem trade.
Kyanite in Quartz
Exceptional Red Spinels and Fine Aquamarine
Arzakite Inclusion in Ruby from Mogok
Apatite Cluster in Orthoclase Feldspar
An apatite crystal cluster, notable for its morphology and size, is found in a feldspar specimen.
Trapiche and More...
Trapiche Tourmaline from Zambia
Well-formed crystals of green tourmaline from northwestern Zambia show a growth pattern reminiscent of trapiche emerald/ruby when sliced perpendicular to the c-axis.
