Tabashir: An Opal of Plant Origin

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Science  28 Jan 1966:
Vol. 151, Issue 3709, pp. 464-466
DOI: 10.1126/science.151.3709.464


A specimen of tabashir, a variety of opal found in bamboo, contained more water but smaller amounts of alkalis and alkaline earths than most opals. It consisted of particles of about 100 angstroms in diameter, linked together in clumps, which appeared in fractured surfaces as irregularities. The tabashir was amorphous, but its microstructure differed from that of silicagel and amorphous opal of inorganic origin.