Phlogopite : KMg3(AlSi3O10)(OH)2
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“Phlogopite specimen from Henderson's Quarry, Mt. Ngongotaha, Rotorua, New Zealand. Photomicrograph © Saul Krotki 2005 (.0683). Specimen provided by Brian Carney. Field of view 1.5 mm. ”
Saul Krotki - 19th April 2005
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