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WHITE SILVER-ORE. 87 3. The colour of the streak distinguishes the two sub species from one another: the dark red affords a cochineal or brick red coloured streak; but the light red ore an aurora-coloured streak. 4?. The Light Red Silver-ore, as already mentioned, occurs usually with native arsenic, and white cobalt-ore, also with orpiment and heavy-spar; but the dark, on the contrary, with galena or lead-glance, white silver-ore, brittle silver-ore, quartz, calcareous-spar, and iron-py- rites. They are thus, by these geognostic characters, well distinguised from one another. 5. In the Hartz and Hungary, it is principally the dark red silver-ore which occurs. 10. White Silver-Ore. Weiss-Giltigerz, Werner. Id. Wern. Pabst. b. i. s. 58. Id. Wid. s. 711—Light Grey Sil ver-ore, Kirtv. vol. ii. p. 119—'Weiss-Giltigerz, Eslner, b. m. s. 443. Id. Emm. b. ii. s. 195—La Mine blanche riche, Broch. t. ii- p. 150.—Weiss-Gultigerz, Beuss, b. iv. s. 193. Id. Lnd. b. i. s. 217- Id. Mohs, b. iii. s. 193. Id. Leonhard, Tabel. s. 55 Argent blanc, Brong. t. n. p. 25o.—Weiss- Gultigerz, Karslen, Tabel. s. 68. Id. Ham. s. 74—Plomb sulphure antimonifere et argentifere, Hauy, Tabl. p. 89. White Silver, Aikin, p. 22. External Characters. Its colour is very light lead-grey; but when it ap proaches to silver-glance, it inclines somewhat to black. It occurs massive and disseminated, and always asso ciated with lead-glance. Internally it alternates from glimmering to glistening, I? 4, and