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Autunite (var. Meta
Perfectly formed book of tetragonal crystals developed at the tip of a thin matrix of microcrystalline cookeite, itself previously formed on a later dissolved spodumene crystal the imprint of which it kept, with small crystals of quartz formed thereafter. The autunite is bright, of a beautiful "electric" green, and well formed, which is typical of pegmatite phosphates.
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Mina Golconda, Governador Valadares, Vale do Doce, Minas Gerais,
Added on11/10/2024
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