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Arsenopyrite : FeAsS - (Fe0.90Co0.10)AsS, Quartz : SiO2 | |
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Negra Mine, Maconi, Mun. de Cadereyta, Queretaro, Mexico Arsenopyrite crystals with quartz. Specimen is from the collection of Miguel Romero #1892 (1980). Scale at bottom of image is an inch with a rule at one cm. |
| Photo ID: 217845 View Count: 44 | |
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Santiago Mine, San Pedro Ahuacatlán (Ahuacatlán), Mun. de San Juan del Río, Queretaro, Mexico A gorgeous large plate of multiply twinned modified rhombohedra on a pink matrix that may be smithsonite (not tested). 13cm X 12cm X 2.5cm |
| © Geoffrey Krasnov | Photo ID: 224197 View Count: 37 |
Dellaite : Ca6(Si2O7)(SiO4)(OH)2, Rustumite : Ca10(Si2O7)2(SiO4)Cl2(OH)2, Spurrite : Ca5[CO3|(SiO4)2] | |
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Negra Mine, Maconi, Mun. de Cadereyta, Queretaro, Mexico Labelled as "dellaite and rustumite in spurrite" from Querétaro, Mexico. The assigned locality detail is assumed, as this is the only location for spurrite in the MinDat database that corresponds to the label. An accompanying discription indicates that the two minerals occur as intermixed white grains in the spurrite. 2.5 cm field of view. ... |
| © 2007, JGW | Photo ID: 138221 View Count: 269 |
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Queretaro, Mexico Obsidian. Specimen size 9,5x7x6cm. Photo and collection Jorge M. Alves |
| © Jorge M. Alves | Photo ID: 117850 View Count: 192 |
Opal : SiO2·nH2O | |
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Queretaro, Mexico Opal (var Fire Opal) 40x25 mm. Rui Nunes specimen and photo. |
| © Rui Nunes 2006 | Photo ID: 50112 View Count: 251 |
Opal : SiO2·nH2O | |
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Carbonea Mine, La Trinidad, Mun. de Tequisquiapan, Queretaro, Mexico Sample with 3x3x2cm - November of 2005 |
| © Martins da Pedra | Photo ID: 58377 View Count: 222 |
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Carbonea Mine, La Trinidad, Mun. de Tequisquiapan, Queretaro, Mexico Measures 70 X 80 mm. Ex: Irv Brown Collection. www.freilichminerals.com |
| © Joseph A. Freilich, LLC | Photo ID: 137758 View Count: 161 |
Opal : SiO2·nH2O | |
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Queretaro, Mexico Masses of opal to 1.5cm across, with flashes of pale green and red fire, in rhyolite matrix. Photographed by Karl Volkman. In the Collection of Donald Volkman. |
| © Karl Volkman 12/07 | Photo ID: 140068 View Count: 139 |
Opal : SiO2·nH2O | |
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Queretaro, Mexico Nodule in weatthered trachyte Size: 12 x 9 cm Collection: The Natural History Museum, London |
| © L.Bernard | Photo ID: 105500 View Count: 136 |
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Carbonea Mine, La Trinidad, Mun. de Tequisquiapan, Queretaro, Mexico Opal on Ryolite. Specimen size 6x3cm. Photo and collection Jorge M. Alves |
| © Jorge M. Alves | Photo ID: 103579 View Count: 133 |
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