Siderite and Radial Biotite from North Carolina Price: $32.00 ID Code = Sid-0001   Click on each picture to enlarge This specimen, collected in Burke County, North Carolina, consists of blocky massive siderite with unusual radial biotite, along with massive quartz and feldspar. The dimensions of the large specimen are 11" long by 8" wide by 4" thick with a weight of 11-3/4 pounds.