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Almandine : Fe2+3Al2[SiO4]3 | |
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Poaia pegmatite, Poaia, Santa Maria do Suaçui, Minas Gerais, Southeast Region, Brazil 13mm red crystal in matrix. Geraldo Alvim specimen and photograph. |
| © Geraldo Alvim | Photo ID: 158608 View Count: 27 |
Apatite, Muscovite : KAl2[(OH)2|AlSi3O10], Albite : Na[AlSi3O8] | |
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Linópolis, Divino das Laranjeiras, Doce valley, Minas Gerais, Southeast Region, Brazil Green apatite hexagonal in albite and muscovite. Crystal width 30 mm, personal collection of Geraldo Alvim |
| © Geraldo Alvim | Photo ID: 137046 View Count: 68 |
Apatite-(CaOH) : Ca5[OH|(PO4)3] | |
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Sapo Mine, Goiabeira, Doce valley, Minas Gerais, Southeast Region, Brazil This Apatite has finally been correctly identified as the species Hydroxylapatite, very less common than Fluorapatite. Crystals, on a matrix of Orthoclase, are flat hexagonal dipyramids with no prism faces, a habit that is not often seen with Apatite. Geraldo Alvim Photo and collection. Specimen size: 4.4 x 2.1 x 1.5 cm Main crystal size: 1.2 x ... |
| © Geraldo Alvim | Photo ID: 158605 View Count: 15 |
Azurite : Cu3[OH|CO3]2, Malachite : Cu2[(OH)2|CO3] | |
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Seabra, Bahia, Northeast Region, Brazil Size: 10 X 7 x 3,5cm Collection and photo: Geraldo Alvim |
| © Geraldo Alvim | Photo ID: 158712 View Count: 23 |
Beryl : Be3Al2Si6O18, Albite (Var: Cleavelandite) : Na[AlSi3O8] | |
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Mantena, Minas Gerais, Southeast Region, Brazil Beryl crystal on a Cleavelandite matrix. Specimen size 5,8x5x3,2cm. Beryl 32x4mm. Photo and Collection; Geraldo Alvim. |
| © Geraldo Alvim | Photo ID: 158611 View Count: 34 |
Buergerite : [Na][Fe3+3][Al6][O3|F|(BO3)3|Si6O18] | |
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Minas Gerais, Southeast Region, Brazil Terminated brownish buergerite tourmaline crystals. 5cm. Collection and photo Geraldo Alvim. |
| © Geraldo Alvim | Photo ID: 158701 View Count: 31 |
Calcite : CaCO3 | |
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Rio Grande do Sul, South Region, Brazil Calcite 8x5x4 cm. Photo & Collection Geraldo Alvim. |
| © Geraldo Alvim | Photo ID: 158717 View Count: 22 |
Calcite : CaCO3 | |
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Pedreira do Vidro Quarry, Alcobaça, Leiria District, Portugal Calcite gold Doubly terminated . 9x5x5 cm. Geraldo Alvim Photo and Collection. |
| © Geraldo Alvim | Photo ID: 158716 View Count: 21 |
Chrysoprase | |
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Mantena, Minas Gerais, Southeast Region, Brazil Massive green chrysoprase. Overall size: 130 x 70 x 50mm - Photo and collection Geraldo Alvim. |
| © Geraldo Alvim | Photo ID: 158703 View Count: 23 |
Chrysotile : Mg3Si2O5(OH)4 | |
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Gualba quarries, Gualba de Dalt, Vallès Oriental, Barcelona, Catalonia, Spain Green chrysotile. Size of specimen - 4 cm. |
| © Geraldo Alvim | Photo ID: 158713 View Count: 28 |
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