Perù

Epidote
Group of prismatic XX, dark green up to 7.5cm
7.5x4cm
Castrovirreyna Province, Huancavelica Department. Perù
Specimen n.486

Fluorite
Two octahedral XX, white and transparent (one side is opaque), the biggest has an edge of 1.6cm. The fluorite is on the top of a group of quartz XX, with some hubnerite on the base 
8x6cm
Huaron mining district, San Josè de H. district, Alcides Cassion prov. Perù
Specimen n.426

Another photo: a bigger view

Fluorite
Cubic XX grown together, amongst small quartz XX. The XX are transparent, pale blue, and the inner part is yellowish 
7x6cm
Huanzala mine, Huallanca District, Dos de Mayo Province. Perù
Specimen n.717

Proustite
Group of XX, 0.5 cm wide
5x4cm
Uchucchacua mine, Oyon prov., Lima dept. Perù
Specimen n.397

Rhodocrosite
Detail of a specimen with a single X, 2.5cm long, in a cavity
7x8cm
Uchucchacua mine, Oyon prov., Lima dept. Perù
Specimen n.211

Brasil

Quartz
Single X, perfectly transparent, with "chlorite" inclusion
9.7x5cm
Corinto, Minas Gerais. Brasil
Specimen n.341

Quartz scepter
Single X, quite unusual since the top (the second generation) is very large and the first generation crystal is very thin. It is also evident the "skeletal" ("tramoggia" in Italian) formation
6x6.8cm
Aracuài, Minas Gerais. Brasil
Specimen n.340

Quartz scepter
XX up to 9.5cm tall, with a kaolinite coating, typical from this place
8x7.5cm
Serra Negra, Baixio, Gov Valadares, Minas Gerais. Brasil
Specimen n.443

Argentina

Fluorite
Cubic XX, edge up to 2.5cm, yellow/green, on fluorite and chalcedony matrix 
10x6.5cm
El Portezuelo, Sierra de Ascasti, Catamarca. Argentina
Specimen n.636