Bournonite

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Very large twinned crystal shaped like an extruded cross, bright and very well-formed, on a matrix of small quartz crystals, sphalerite tufts and small pale blue fluorite crystals. This specimen was nicknamed "Lalibela" in reference to the Unesco World Heritage Site Lalibela, Ethiopia, due to the resemblance of the crystal with the churches built as extruded crosses found at that site.

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Bournonite
Mineral guide
Learn about Bournonite
steel-gray to black sulfosalt famed for cogwheel twinning and metallic luster; prized by collectors for iconic gears and historic localities.
Bournonite
Regional guide
Bournonite from Yaogangxian Mine, China
from Yaogangxian Mine, China: silvery gray, sharply crystallized crystals with twinning; part of a rich hydrothermal assemblage prized by collectors.