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161. Opal, 11711

162. Opal, 11710

163. Opal, 1017

164. On a supposed new mineral species

165. Olivenite, 9225

166. Okenite, 5728

167. Niter, 9034

168. Niter, 9032

169. Niter, 9031

170. Nickeline, 1872