RY30F8: Extraordinary specimen. The cogwheel twin, along with some other smaller ones, is perfectly placed on the matrix and has maintained its brilliance over the years. The locality is also wonderful: Herodsfoot Mine. To add even more to its glory it was bought from Sir Arthur Russell in 1926.
This specimen's photo has been reviewed and published in the magazine ‘Mineralogical Record’ on page 459 in the volume 43, number 4
Herodsfoot Mine, Lanreath, Liskeard, Cornwall  England / United Kingdom (±1926)

Specimen size: 5.2 × 2.7 × 3.3 cm = 2.05” × 1.06” × 1.30”

Main crystal size: 2.5 × 1.7 cm = 0.98” × 0.67”