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Colemanite: Ca2B6O11·5(H2O)
Comments: Large crystals of brown colemanite with second generation of absolutely clear and gemmy (colorless) colemanite. Intensely fluorescent in long and short UV.. Location: Mustafakemalpascha Mine, West-Anatolia Turkey. Scale: Crystal size: 1.3 x 1 cm. © Fabre Minerals
Comments: Coarsely crystalline colemanite, in part, covered with minute acicular crystals of strontianite. Location: Boraxo #3 pit, Death Valley, California, USA. Scale: 30 cm. © Dave Barthelmy