Bournonite 'cogwheels' to 3.5cm in size on sparklying white Quartz crystals. These are rare English classics mined in the mid to late 1800s. There are a number of good crystals here mixed in among the Quartz, which itself is very bright and showy. There is some contact/damage on the backside, but can be displayed without much, if any, showing. A rare classic that is also aesthetic, with the Bournonite crystals well separated and evenly dispersed across the width of the specimen.