Bournonite Crystal – Cogwheel Twin – China
This exceptional bournonite specimen from China features the characteristic “cogwheel” twinning that gives the mineral its nickname. The sharp, metallic crystals have a bright luster and are set on a contrasting matrix, making this a high-quality and aesthetically pleasing collector’s piece.
Specimen details
| Mineral | — |
|---|---|
| Locality | China |
| Crystal system | — |
| Dimensions | 4.3 cm × 3.0 cm × 3.0 cm |
| Weight | 85 g |
| Color | Metallic |
| Size | Miniature (up to 2 inches / up to 5 cm) |
| Species | None |
| Condition | No damage on display faces |
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About this specimen
Uncover the allure of the Bournonite Crystal, a striking metallic sulfide specimen originating from China. This rare old stock gem is a must-have for collectors, offering a unique glimpse into geological beauty. Its captivating sheen and distinct formation make it an exceptional addition to any mineral collection.
Bournonite (PbCuSbS3) crystallizes in the orthorhombic system and is well-known for its characteristic “cogwheel” twinning, which is prominently displayed in this specimen. With a Mohs hardness of 2.5 to 3, it exhibits a bright metallic luster that reflects light beautifully across its sharp, well-defined crystals. The deep lead-gray to steel-blue coloration contrasts strikingly against the matrix, enhancing its visual appeal and making it a standout display piece.
This specimen hails from a notable locality in China, a region recognized for yielding fine bournonite crystals sought after by mineral enthusiasts worldwide. Its provenance adds to its collectible value, as Chinese bournonite specimens with such clarity and twinning are relatively uncommon.
Collectors will appreciate not only the rarity but also the aesthetic quality of this piece, which combines scientific interest with striking form. Due to its moderate softness, it is advisable to handle the specimen with care and avoid exposure to moisture or harsh chemicals to preserve its natural luster.
About China
