Plasma

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Campsie Fells, Central Region (Stirlingshire), Scotland, UK
© J.Ralph 2009

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: as:

of a dullish green color with yellow and whitish dots and a glistening lustre

J.D.Dana (1837)

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.

Classification of Plasma
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Other Information
Health Warning:	No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
References for Plasma
Reference List: - +	J.D.Dana (1837) Syst. Min., 1st ed., p.341 R.Jameson (1816) A syst. of min., p.213
Internet Links for Plasma
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Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 19th Jun 2011 22:53:36

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Mineral:
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Plasma

Classification of Plasma

Other Information

References for Plasma

Internet Links for Plasma