Adularia (Moonstone) is a semi-precious, clear, transparent, glassy form of potashfeldspar which is found mainly in the crevices of crystalline schists and gneisses, often in beautifully perfect crystals. It has sometimes a pearly, opalescent reflection or play of colours. It derives its name from Adula, a mountain peak in Switzerland, where fine specimens are found. Research Adularia
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Matt and Leela Probert
Abbreviations
Research Adularia
