Sphalerite on Quartz with Calcite, Cumbria, England, Miniature-Sized SpecimenApprox. Dimensions: 1. 7 in x 1. 5 in x . 7 in Approx. Weight: 43 grams Black Sphalerite covers a mass of Quartz and a sprinkle of Calcite adding a metallic and dusty look to the colorless Quartz. Crystals are sized in descending order with Calcite having the smallest crystals, Quartz the largest, and Sphalerite sized in between. Specimen has a contrasting and layered look in a miniature sized specimen.