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Charcoal

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About CharcoalHide

Formula:
C
Colour:
black
Crystal System:
Amorphous
Not a true mineral species, but rather a term used in old geological literature for carbon produced by the incomplete burning (pyrolysis) of trees and other vegetation in lava and pyroclastic flows (especially in Japan). Occasionally also used (especially in the USA) for carbonized vegetable matter in sedimentary rocks, where it may be associated with lignite or silicified wood. (Note that we are talking here only about charcoal in a geological context; the word does of course have many other uses outside of geology.)

Chemically almost pure carbon, with minor hydrocarbon and inorganic mineral impurities, although the chemistry and structure is variable and still poorly understood. Might be considered a highly disordered graphite, although this is an oversimplification, and completely amorphous carbon and fullerenes (C60) seem to be involved too.


Physical Properties of CharcoalHide

Transparency:
Opaque
Colour:
black

Chemical Properties of CharcoalHide

Crystallography of CharcoalHide

Crystal System:
Amorphous

Synonyms of CharcoalHide

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for CharcoalHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Transactions of the American Institute of Mining Engineers, vol 33 (1903), 459-460.

Internet Links for CharcoalHide

Localities for CharcoalHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Dominican Republic
 
  • Barahona Province
    • Sierra de Baoruco
      • Los Checheses
Rock Currier, pers. comm.; Alfredo Petrov, field observations; also as "carbon" in Woodruff & Fritsch (1989) Gems and Gemology, winter, 216-225.; http://www.ige.org/archivos/laboratorio/mineria_del_Larimar_en_la_Republica_Dominicana-2.pdf - 2nd part of the article by Espí & Pérez-Puig (2009) at Publicación tecnológica y docente de la Escuela de Minas de Madrid. Nº6, 2009, pp. 102-113. (in Spanish)
Japan
 
  • Hokkaidō
    • Okhotsk Subprefecture (Abashiri Province)
Katsu, Y. and Satoh, H. (1963) Explanatory text of the geological map of Japan, scale 1:50,000, Mokoto-yama (Abashiri-49) (Geological Survey of Japan)
  • Iwate
Takeo Kato, Takeo Watanabe, Akira Nakamoto (1934) on the sulphur deposits associated with iron sulphide ore, found in the Quaternary Formation of Japan. Japan Journal of Geology and Geography, 15, 3-4, 287-324.
  • Tokyo
    • Izu Archipelago
Alfredo Petrov, field observations in ash layer from 1874 eruption.
  • Yamanashi
Kanehira, K. and Shimazaki, Y. (1971) Native iron in basalts surrounding tree-molds at Mt. Fuji, Japan. Neues Jahrbuch Mineralogie, Monatsheft 3, 124-130.
New Zealand
 
  • Waikato Region
    • Taupo District
      • Wairakei
Judy Rowe and Dave Blakemore specimens
    • Waikato District
      • Huntly
Wezenburg, U. (1988) An engineering geological investigation of batter stability, Weavers open cast coal mine, Huntly (unpublished thesis, MSc), University of Canterbury.
Panama
 
Julius Weber collection (obtained from Robert F. Barrell)
USA
 
  • Arizona
    • Navajo Co.
      • Black Mesa
Tauber, Sebastian (2015) unpublished data on site visit.
  • Colorado
    • Custer Co.
      • Rosita Mining District
Transactions of the American Institute of Mining Engineers, vol 33 (1903), 459-460.
Transactions of the American Institute of Mining Engineers, vol 33 (1903), 459-460.
  • Utah
    • Washington Co.
      • Leeds
Transactions of the American Institute of Mining Engineers, vol 33 (1903), 459-460.
 
Mineral and/or Locality  
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