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meaning that it has lustre and some translucency without the fire or color play associated with precious opal varieties
the mineral was named for French paleontologist Eugene Durmortier (1803 to 1873)
piñon Cubano
It is a particularly unusual gem because it exhibits a special optical property known as "tenebrescence
Biotite was named in honor of the French physicist Jean-Baptiste Biot
Dendritic Opal 9-10mm Irregular Rondelle - 15-16 Inch 01132022FEATURE meaning that it has lustreThis variety of opal is named "dendritic" for the small inclusions within it that resemble moss or ferns. These inclusions consist of iron, manganese and other metallic oxides captured during the forming of the rock. Opals are hydrated amorphous forms of silica, created when silica hardens within the fissures of other stones. Note Due to the unique hand made manufacturing process of these beads, the strand length, bead measurements, colors, and beads