Opal

Opal species

Opal in rhyolite matrix

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Opal with play of colors, embedded in its rhyolite cantera matrix

Opal in rhyolite cantera matrix, Queretaro, Mexico.

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Galena and Sphalerite

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Spinel-twined galena crystals, with great metallic luster, black lustrous sphalerite crystals on top"

Galena and Sphalerite, Naica, Chihuahua, Mexico.

Calcite, Dolomite, Chalcopyrite and Vesuvianite

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Set of mineral species, a matrix of iridescent chalcopyrite, one side covered with white dolomite, and the other side covered with pentadodecahedral transparent calcite crystals. and a tiny set of vesuvianite crystals peeking out.

Calcite, Chalcopyrite, Dolomite, Vesuvianite

Pyrite and Galena

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long floater pseudo-cubic pyrite crystal with brass luster and striated faces, partially covered with lots of tiny lustrous galena crystals.

Pyrite and Galena, Tatatila, Veracruz, Mexico.

Faden Quartz

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Set of tabular quartz crystals arranged vertically with a white thread along the specimen in one side, in the other side chlorite inclusions make green the internal line, which defines this variety of quartz.

quartz var faden, Balochistan, Pakistan.

Pyrite and Galena

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Set of floater pseudo-pyritohedron pyrite crystals, with striated faces, partially covered with silver gray epitaxial galena crystals.

Pyrite and Galena, Tatatila, Veracruz, Mexico.

Creedite

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Creedite specimen disposed in spherical shape, sharp and lustrous crystals radiating 360 degrees around its matrix.

Creedite, Navidad mine, Rodeo Durango, Mexico.

Calcite and Galena

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Semi-sphere of white lustrous calcite among scalenohedral calcite crystals covering galena matrix.

Calcite and Galena, Zimapan, Hidalgo, Mexico.

Creedite

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Creedite specimen disposed in di-spherical cluster with sharp crystals and high luster, typical orange color for this location.

Creedite, Navidad mine, Rodeo Durango, Mexico.

Quarz var. Amethyst

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Cluster of very pointed elongated amethyst quartz crystals on matrix, with color zonning at the tips.

Veracruz Amethyst, Piedra Parada, Las Vigas, Veracruz, Mexico

Pyrite on Calcite

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Very lustrous pyrite crystals, pyritohedron shape (pentadodecahedron). embedded on white scalenohedral white pointed calcite crystals, on quartz matrix

Pyrite on Calcite, Zimapan, Hidalgo, Mexico

Quarz var. Amethyst

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Cluster of big to medium size amethyst quartz crystals, sharp and well formed, sited on brown calcite matrix.

Veracruz Amethyst, Piedra Parada, Las Vigas, Veracruz, Mexico

Rough Turquoise

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Chunk of blue-green rough turquoise mixed with matrix

Turquoise, Concepcion del oro, Zacatecas, Mexico.

Andradite

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Very lustrous black andradite crystals cluster.

Andradite var Melanite Julimes Chihuahua Mexico

Selenite gypsum over calcite

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Clear gypsum variety selenite crystal on yellowish calcite matrix, from famous Naica mine

Gypsum var Selenite, Naica, Mexico.

Opal in rhyolite matrix

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Opal with play of colors, embedded in its rhyolite cantera matrix

Opal in rhyolite cantera matrix, Queretaro, Mexico.

Wulfenite on Mimetite and Limonite

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Cluster of dipyramidal yellow wulfenite crystals over green mimetite botryoidal aggregates, all sited on limonite matrix.

Wulfenite and mimetite over limonite, Ojuela mine, Mexico.

Rhodochrosite on Ilvaite

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Botryoidal aggregates of rhodochrosite over ilvaite matrix.

Rodocrosite on ilvaite, Taxco, Guerrero, México.