AllMinerals/JohnBetts-FineMinerals > Online Mineral Museum Photographic Archive > Minerals from China > Bournonite (doubly terminated complexly twinned crystals)

Bournonite (doubly terminated complexly twinned crystals) from Yaogangxian Mine, 32 km southeast of Chenzhou, Hunan, China

DESCRIPTION:	No. 81544
Mineral:	Bournonite (doubly terminated complexly twinned crystals)
Locality:	Yaogangxian Mine, 32 km southeast of Chenzhou, Hunan, China
Description:	Long doubly-terminated lustrous silver-metallic bournonite crystals with no matrix attached. The bournonite crystals are repeatedly twinned on the {110} plane resulting in classic cogwheel-habit that resembles a gear with teeth when viewed on end. Bournonite, PbCuSbS3, is an uncommon lead-copper sulfosalt mineral. Weight: 21.7 grams. Reference: Mineralogical Record v.42#6, Rocks and Minerals v.80#1
Overall Size:	40x16x15 mm
Crystals:	5-40 mm
Archived:	For reference only

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