![cabochon of dumortierite from Africa](https://www.patrickvoillot.com/wp-content/uploads/2021/03/dumortierite-cabochon-afrique187.png)
dumortierite
Its name honors Eugene Dumortier, a paleontologist from Lyon (France )(1802-1873). It occurs most commonly as quartz inclusions, it is then called “blue aventurine”.
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Its name honors Eugene Dumortier, a paleontologist from Lyon (France )(1802-1873). It occurs most commonly as quartz inclusions, it is then called “blue aventurine”.
Its name recalls its dominant color : blue in Greek (cyan). Sometimes colorless, but generally blue to bluish green, this gemstone has a hardness ranging, with its texture in plans, from 4.5 (direction of elongation) at 6 to 7 (perpendicular to the elongation). It also
For the geologist, the mineralogist and the gemologist, it is neither a mineral or a fossil, or even a rock. This is the central limestone axis around which small polyps have developed, they secrete it and shelter there. These are animals of the Coelenterata phylum
It pays tribute to W. Coleman (1824-1893), founder of the borax industry in California.