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Axinite Ca2(Fe,Mg,Mn)Al2BH[SiO4]4 wedgelike tizenite from Scopi Medels, Switzerland. |
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Beryl Be3Al2Si6O18 aquamarines from the Ural Mountains, Russia. |
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Beryl Be3Al2Si6O18 emeralds from Takowaja, Ural Mountains, Russia. |
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Chrysocolla CuSiO3 · n H2O fine-grained aggregates from Globe, Arizona, USA. |
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Cordierite Mg2Al3[AlSi5O18] rounded "water sapphire" ("iolite") from Ceylon. |
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Neptunite (Na,K)2(Fe,Mn)Ti[Si4O12] idiomorphic carlosite from San Benito, California, USA. |
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Tourmaline XY9(OH,F)4[B3Si6O27] idiomorphic crystals from Minas Gerais, Brazil. |
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Tourmaline XY9(OH,F)4[B3Si6O27] rubellite from Barras de Salinas, Brazil. |
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Tourmaline XY9(OH,F)4[B3Si6O27] schorl from Mursinka, Ural Mountains, Russia. |
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Tourmaline XY9(OH,F)4[B3Si6O27] verdelite and indigolite from Kangaroo Island, Australia. |
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