Patent ID: 9567466
Date: 2017-02-14
CPC Classifications: C09D,E04D,Y10T

Claim:
1. A roofing granule comprising a material comprising a transition metal carbonate; a mixed metal carbonate, wherein at least one metal within the mixed metal carbonate includes a transition metal; a first metal carbonate and a second metal compound, wherein the first and second metals are different metal elements; a third metal carbonate and silica, wherein the roofing granule further comprises a base particle, wherein the roofing granule further comprises a remaining portion of the base particle having a first volume, at least a portion of the material is disposed between the remaining portion of the base particle and the exposed surface of the roofing granule at a distance of no greater than approximately 2 mm from the exposed surface towards a center of the roofing granule, the material having a second volume and the material and base particle include a same metal element and a ratio of the first volume and the second volume is at least 1.1:1, wherein the material occupies at least approximately 50% of the entire volume of the roofing granule.