Orthoclase

specimen number:
2312114

location:
Kopriva, Kyustendil, Bulgaria

description:
A loose double terminated twinned crystal grouping of orthoclase. Neat locality example for the species, in great condition.

The village of Kopriva, situated in the Kyustendil Province of southwestern Bulgaria, lies within a region characterized by complex geological structures and a long history of mineral exploration and small-scale mining. Geologically, the area features Paleogene volcanic units, notably the Kopriva trachyrhyodacites within the Prekolnitsa graben. These volcanic formations are famous among mineral collectors and petrologists for hosting large, well-formed feldspar phenocrysts. Specifically, the site yields notable macro-crystals of orthoclase, frequently displaying distinct Carlsbad twinning.

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