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Plasma

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About PlasmaHide

Formula:
SiO2
A variety of Chalcedony

A microgranular or microfibrous form of chalcedony coloured in various shades of green by disseminated silicate particles (variously attributed to celadonite, chlorite, amphibole, etc.).

Various descriptions of Plasma include
of a dullish green color with yellow and whitish dots and a glistening lustre
J.D. Dana (1837)
and
Its most common colour is a variety intermediate between grass green and leek green and sometimes approaching to pale mountain green It frequently occurs greenish white and oehre yellow the latter colour is in dots the first in spots or clouded Internally its lustre is glistening inclining to glimmering.
R. Jameson (1816)

Compare with Prase, which has a very much more defined colour ("leek green") and is generally more translucent.

Visit gemdat.org for gemological information about Plasma.


Chemical Properties of PlasmaHide

Formula:
SiO2

Common AssociatesHide

Associated Minerals Based on Photo Data:
Jasper1 photo of Plasma associated with Jasper on mindat.org.

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 PlasmaHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
J.D. Dana (1837) Syst. Min., 1st ed., p.341
R. Jameson (1816) A syst. of min., p.213

Internet Links for PlasmaHide

Localities for PlasmaHide

ⓘ - 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.
Australia
 
  • Western Australia
    • Menzies Shire
Grguric, B.A., Pring, A., Bevan, A.W.R., Downes, P.J. (2006): The Minerals of Comet Vale Western Australia, Australian Journal of Mineralogy (2006):12: 9-23
Fetherston, J. M., Stocklmayer, S. M. and Stocklmayer, V. C. (2013): Gemstones of Western Australia. Mineral Resources Bulletin 25, Geological Survey of Western Australia, Perth, Australia, 133 pp.
India
John Coggin Brown (1955) Mineral Wealth: Part III. Materials used in building construction, civil engineering, etc.
UK
 
  • England
    • Shropshire
      • Hope-Shelve District
        • Stiperstones
Paul Render
Mineral and/or Locality  
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