Rock Crystal with Chalcopyrite from the Huarón Mining District, Peru

This mineral specimen comes from the historic Huarón mining district in the Pasco region of Peru. Numerous white to colorless quartz crystals cover a dark, sulfide-rich matrix. Small chalcopyrite crystals occur between the quartz crystals, creating a distinct contrast with the pale crystal group through their metallic luster.

The quartz crystals are intergrown in a three-dimensional arrangement and oriented in different directions. This creates an open, lively crystal group that can be displayed both vertically and in a broader side view.

Measuring 9.0 × 6.3 × 3.0 cm and weighing 172.5 g, the specimen belongs to the cabinet specimen size category.

Dense Group of Prismatic Quartz Crystals

The quartz forms numerous long prismatic crystals with clearly developed terminations. Several larger crystals stand out among the many smaller ones and define the three-dimensional structure of the specimen..

The crystals are predominantly white to colorless and translucent. Individual thinner crystals and marginal areas appear partially transparent. Fine growth structures are locally visible on the crystal faces.

The varying orientation of the quartz crystals creates a diverse overall form. Some crystals project steeply from the matrix, while others extend more horizontally or grow diagonally across neighboring crystals.

Chalcopyrite as a Contrasting Associated Mineral

Numerous small chalcopyrite crystals and sulfide sections occur between the quartz crystals. They appear dark brass-colored to locally brownish due to surface tarnishing and stand out clearly against the white quartz.

The chalcopyrite does not form a single dominant crystal but is distributed across large areas of the specimen. The detailed view shows particularly well how the metallic sections occur between and partly on the quartz crystals.

The association of pale quartz and metallic chalcopyrite is characteristic of many hydrothermal ore assemblages in the Peruvian Andes.

Mineral Specimen from a Classic Peruvian Mining District

The Huarón district is one of Peru’s important polymetallic mining regions. Its hydrothermal vein systems produced numerous sulfides and associated minerals, including quartz and chalcopyrite.

This specimen displays the association as a broadly crystallized cabinet specimen. Quartz forms the dominant visual component, while the scattered chalcopyrite crystals document the specimen’s ore-deposit context.

The piece therefore combines an attractive crystal group with a classic provenance from Peru’s mining industry.