Geraldo Alvim's Gallery

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Albite (Var: Cleavelandite) : Na[AlSi3O8]
	Jaime Pacheco claim, Linópolis, Divino das Laranjeiras, Doce valley, Minas Gerais, Southeast Region, Brazil A beautiful 36 x 26 mm specimen transparent Cleavelandite. Geraldo Alvim specimen and photograph.
© Geraldo Alvim	Photo ID: 158709    View Count: 231
Almandine : Fe2+3Al2[SiO4]3
	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: 134
Apatite, Muscovite : KAl2[(OH)2|AlSi3O10], Albite : Na[AlSi3O8]
	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: 162
Apatite-(CaOH) : Ca5[OH|(PO4)3]
	Sapo mine, Conselheiro Pena, 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: 83
Azurite : Cu3[OH|CO3]2, Malachite : Cu2[(OH)2|CO3]
	Seabra, Bahia, Northeast Region, Brazil Size: 10 X 7 x 3,5cm Collection and photo: Geraldo Alvim
© Geraldo Alvim	Photo ID: 158712    View Count: 105
Beryl : Be3Al2Si6O18, Albite (Var: Cleavelandite) : Na[AlSi3O8]
	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: 120
Beryl (Var: Red Beryl) : Be3Al2Si6O18
	Wah Wah Mts, Beaver Co., Utah, USA A well developed, gemmy, 7 mm red beryl crystal perched in rhyolite matrix. Collection and photo: Geraldo Alvim
© Geraldo Alvim	Photo ID: 232824    View Count: 29
Calcite : CaCO3
	Rio Grande do Sul, South Region, Brazil Calcite 8x5x4 cm. Photo & Collection Geraldo Alvim.
© Geraldo Alvim	Photo ID: 158717    View Count: 145
Calcite : CaCO3
	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: 105
Chrysoprase
	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: 156

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