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It is a particularly unusual gem because it exhibits a special optical property known as "tenebrescence
It occurs in bright turquoise blues and darker blues as well as rust reds
Sodalite is named for its sodium content and may be classified as a feldspathoid
Biotite was named in honor of the French physicist Jean-Baptiste Biot
Dutch Colonel Hendrik Von Prehn
Dendritic Opal 9-10mm Irregular Rondelle - 15-16 Inch 01132022FEATURE It is a particularly unusualThis 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
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