Las Choyas, Mun. de Ahumada, Chihuahua, Mexico

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Calcite : CaCO₃, Quartz : SiO₂
	Las Choyas, Mun. de Ahumada, Chihuahua, Mexico Smoky quartz geode, sliced and polished to show hollow interior, lined with superb transparent calcite crystals up to 25 mm. The calcite crystals have many complex faces and are exceptionally well crystallized. No damage. Overall size of mineral specimen: 11x10x6 cm. Size of individual crystals: 3-25 mm.
© 2002 John H. Betts	Photo ID: 5628 View Count: 410
Calcite : CaCO₃, Quartz (Var: Amethyst) : SiO₂
	Las Choyas, Mun. de Ahumada, Chihuahua, Mexico 11.4 x 10.3 x 5.5 cm. A striking and beautiful geode half highlighted by a 2.6 cm, gemmy, amber calcite scalenoehdron. The geode is lined with sparkly, dark amethyst crystals and a few, doubly terminated, pencil calcites to 1.3 cm are a very nice accent. The sawed edge has been sprayed with krylon to give it gloss. Ex. Steve Smale Collection.
© Rob Lavinsky	Photo ID: 243403 View Count: 19
Geode
	Las Choyas, Mun. de Ahumada, Chihuahua, Mexico Geode with Amethyst crystals. specimen size 10,5x9cm. Photo and Collection; Jorge M. Alves.
© Jorge M. Alves	Photo ID: 79065 View Count: 429
Quartz : SiO₂, Calcite : CaCO₃
	Las Choyas, Mun. de Ahumada, Chihuahua, Mexico Geode of quartz, 7 cm in diameter.
© Cristian B.	Photo ID: 63648 View Count: 208
Quartz (Var: Amethyst) : SiO₂, Calcite : CaCO₃, Chalcedony (Var: Agate) : SiO₂
	Las Choyas, Mun. de Ahumada, Chihuahua, Mexico A 8.5cm wide "Mexican Coconut" with a blue-gray agate shell, Amethyst lining and a group of calcite crystals on one side
© Don Volkman 9/17/08	Photo ID: 185455 View Count: 114
Quartz (Var: Smoky Quartz) : SiO₂, Calcite : CaCO₃
	Las Choyas, Mun. de Ahumada, Chihuahua, Mexico Smoky quartz geode, sliced and polished to show hollow interior, lined with transparent calcite crystals. The calcite crystals have many complex faces and several fluoresce green under UV illumination. No damage. Overall size of mineral specimen: 8x8x5 cm. Size of individual crystals: 2-8 mm.
© 2002 John H. Betts	Photo ID: 4122 View Count: 934
Todorokite : (Ca,K,Na,Mg,Ba,Mn)(Mn,Mg,Al)₆O₁₂·3H₂O, Quartz (Var: Amethyst) : SiO₂
	Las Choyas, Mun. de Ahumada, Chihuahua, Mexico 7.2 cm x 7 cm. Elongated, grayish to black todorokite blades 1 to 2 mm in length on amethyst crystals in a geode. Tim Blackwood Collection and photograph.
© Timothy J. Blackwood	Photo ID: 193692 View Count: 117
Todorokite : (Ca,K,Na,Mg,Ba,Mn)(Mn,Mg,Al)₆O₁₂·3H₂O, Quartz (Var: Amethyst) : SiO₂
	Las Choyas, Mun. de Ahumada, Chihuahua, Mexico 7.4 cm x 7.2 cm. Elongated, grayish to black todorokite blades 1 to 2.5 mm in length on amethyst crystals in a geode. Tim Blackwood Collection and photograph.
© Timothy J. Blackwood	Photo ID: 193690 View Count: 94

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Las Choyas, Mun. de Ahumada, Chihuahua, Mexico

Calcite : CaCO3, Quartz : SiO2

Calcite : CaCO3, Quartz (Var: Amethyst) : SiO2

Geode

Quartz : SiO2, Calcite : CaCO3

Quartz (Var: Amethyst) : SiO2, Calcite : CaCO3, Chalcedony (Var: Agate) : SiO2

Quartz (Var: Smoky Quartz) : SiO2, Calcite : CaCO3

Todorokite : (Ca,K,Na,Mg,Ba,Mn)(Mn,Mg,Al)6O12·3H2O, Quartz (Var: Amethyst) : SiO2

Todorokite : (Ca,K,Na,Mg,Ba,Mn)(Mn,Mg,Al)6O12·3H2O, Quartz (Var: Amethyst) : SiO2

Calcite : CaCO₃, Quartz : SiO₂

Calcite : CaCO₃, Quartz (Var: Amethyst) : SiO₂

Quartz : SiO₂, Calcite : CaCO₃

Quartz (Var: Amethyst) : SiO₂, Calcite : CaCO₃, Chalcedony (Var: Agate) : SiO₂

Quartz (Var: Smoky Quartz) : SiO₂, Calcite : CaCO₃

Todorokite : (Ca,K,Na,Mg,Ba,Mn)(Mn,Mg,Al)₆O₁₂·3H₂O, Quartz (Var: Amethyst) : SiO₂

Todorokite : (Ca,K,Na,Mg,Ba,Mn)(Mn,Mg,Al)₆O₁₂·3H₂O, Quartz (Var: Amethyst) : SiO₂