| Revision as of 15:45, 1 January 2025 editNamesnik (talk | contribs)Autopatrolled, Extended confirmed users704 edits to two groups← Previous edit | Revision as of 15:45, 1 January 2025 edit undoNamesnik (talk | contribs)Autopatrolled, Extended confirmed users704 edits Cobalt ochres galleryNext edit → | ||
| Line 9: | Line 9: | ||
| At the same time, Jameson believed that cobalt ochres have a lot in common and can be classified as a special class of minerals. ″The Black, Brown and Yellow Cobalt Ochres, and other similar minerals, ought to be arranged together, and form a particular order by themselves. In the mean time, we place them beside the Red Cobalt, on account of their being often associated with that mineral″.<ref name="robert">'']''. A System of Mineralogy, in which Minerals are Arranged According to the Natural History Method. Vol.2. — Edinburgh, A. Constable & Co., 1820.</ref>{{rp|197}} However, from a chemical point of view, Jameson and his contemporaries reduced the entire diversity of cobalt ochres to two groups of chemical compounds of cobalt: ] (]) and arsenates (]) in different morphological forms of ] and with a different set of impurities. | At the same time, Jameson believed that cobalt ochres have a lot in common and can be classified as a special class of minerals. ″The Black, Brown and Yellow Cobalt Ochres, and other similar minerals, ought to be arranged together, and form a particular order by themselves. In the mean time, we place them beside the Red Cobalt, on account of their being often associated with that mineral″.<ref name="robert">'']''. A System of Mineralogy, in which Minerals are Arranged According to the Natural History Method. Vol.2. — Edinburgh, A. Constable & Co., 1820.</ref>{{rp|197}} However, from a chemical point of view, Jameson and his contemporaries reduced the entire diversity of cobalt ochres to two groups of chemical compounds of cobalt: ] (]) and arsenates (]) in different morphological forms of ] and with a different set of impurities. | ||
| == Essential minerals == | |||
| * ]<ref name="kriv"/>{{rp|172}} — a secondary mineral of the ] with the formula (Со,Ni)O•MnO<sub>2</sub>•nH<sub>2</sub>O, consisting of hydrous oxides of ], ] and ]. Forms sooty, earthy masses (asbolan from the {{langx|grc|ασβολος}} — ]) of dirty colors from yellowish-brown to bluish-black. | |||
| * ]<ref name="kriv"/>{{rp|172}} — a secondary mineral of the ] class with the ideal formula Co<sub>3</sub>(AsO<sub>4</sub>)<sub>2</sub>•8(H<sub>2</sub>O), consisting of {{ill|cobalt(II) arsenate|ru|Арсенат кобальта(II)}} and usually also containing impurities of ], ], ], ] and ]. Due to its bright color, it is used as an indicator of nearby ] ores, and sometimes also ]. | |||
| == Cobalt ochres gallery == | |||
| <br> | |||
| <gallery> | |||
| Asbolan formerly Asbolite on serpentine Hydrous manganese cobalt oxide Porterville Tulate County California 2234.jpg|{{center|]}} | |||
| Erythrite-197790.jpg|{{center|]}} | |||
| </gallery> | |||
| == See also == | |||
| * ] | |||
| * ] | |||
| * ] | |||
| * ] | |||
| * ] | |||
| == References == | == References == | ||
Revision as of 15:45, 1 January 2025
Secondary cobalt minerals| Cobalt ochre | |
|---|---|
 Erythrite (Sonora, Mexico) | |
| General | |
| Category | Mineral |
Cobalt ochre, cobalt-ochre (Cobalt ocher in American English) or ochre of cobalt (German: Erdkobalt) — a common name that was widely used in mining and craft environments until the end of the 19th century for at least two cobalt-containing secondary ore minerals: asbolane and erythrite. They were often used with the addition of a clarifying color adjective or a clarifying mineral form adjective to avoid confusion.
For example, Robert Jameson divided cobalt ochres into four classes: black cobalt-ochres, brown cobalt-ochres, yellow cobalt-ochres and red cobalt-ochres. In turn, each of the color forms of ochre had two or three varieties. Black cobalt ochre had two main forms, which were widely distributed in the mines of Europe: earthy black cobalt-ochre and indurated black cobalt-ochre. Brown or yellow-brown cobalt-ochres varied in composition, sometimes being a mixture of black and yellow cobalt ochres. Yellow cobalt-ochres often appeared in association with various forms of red cobalt-ochres, as well as nickel ochres. Finally, red cobalt ochre was known in three mineral forms: earthy red cobalt-ochre, radiated red cobalt-ochre, and slaggy red cobalt-ochre.
At the same time, Jameson believed that cobalt ochres have a lot in common and can be classified as a special class of minerals. ″The Black, Brown and Yellow Cobalt Ochres, and other similar minerals, ought to be arranged together, and form a particular order by themselves. In the mean time, we place them beside the Red Cobalt, on account of their being often associated with that mineral″. However, from a chemical point of view, Jameson and his contemporaries reduced the entire diversity of cobalt ochres to two groups of chemical compounds of cobalt: oxides (asbolane) and arsenates (erythrite) in different morphological forms of crystallization and with a different set of impurities.
Essential minerals
- Asbolane — a secondary mineral of the oxide class with the formula (Со,Ni)O•MnO2•nH2O, consisting of hydrous oxides of manganese, cobalt and nickel. Forms sooty, earthy masses (asbolan from the Ancient Greek: ασβολος — soot) of dirty colors from yellowish-brown to bluish-black.
- Erythrite — a secondary mineral of the arsenate class with the ideal formula Co3(AsO4)2•8(H2O), consisting of cobalt(II) arsenate [ru] and usually also containing impurities of nickel, iron, zinc, magnesium and calcium. Due to its bright color, it is used as an indicator of nearby cobalt ores, and sometimes also native silver.
Cobalt ochres gallery
See also
References
- ^ Krivovichev V. G. Mineralogical glossary. Scientific editor A. G. Bulakh. — St.Petersburg: St.Petersburg Univ. Publ. House. 2009. — 556 p. — ISBN 978-5-288-04863-0
- ^ Robert Jameson. A System of Mineralogy. Vol.3: Class IV. Metallic Minerals. — Edinburgh, A. Constable & Co., 1816.
- The Edinburgh Encyclopaedia, 1st American ed., Volume 13. J. and E. Parker edition, 1832.
- Robert Jameson. A System of Mineralogy, in which Minerals are Arranged According to the Natural History Method. Vol.2. — Edinburgh, A. Constable & Co., 1820.
Index of articles associated with the same name
This set index article includes a list of related items that share the same name (or similar names). If an internal link incorrectly led you here, you may wish to change the link to point directly to the intended article. Categories: