pleochroic halo
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pleochroic halo — n. a dark colored, microscopic ring around a minute radioactive particle in certain mineral crystals, used in estimating the age of the rocks containing these crystals * * * ▪ mineralogy ring of colour produced around a radioactive impurity … Universalium
pleochroic halo — n. a dark colored, microscopic ring around a minute radioactive particle in certain mineral crystals, used in estimating the age of the rocks containing these crystals … English World dictionary
pleochroism — /plee ok roh iz euhm/, n. the property of certain crystals of exhibiting different colors when viewed from different directions under transmitted light. Cf. dichroism (def. 1), trichroism. [1855 60; PLEOCHRO(IC) + ISM] * * * ▪ optics (from Greek … Universalium
John Joly — Infobox Scientist name = John Joly box width = image size =150px caption = John Joly birth date = November 1 1857 birth place = Bracknagh, County Offaly death date = December 8 1933 death place = Dublin, Ireland residence = citizenship =… … Wikipedia
Allanite — from the Mt. Isa – Cloncurry area, Queensland, Australia (scale bar 1 inch) General … Wikipedia
Radiohalo — Radiohalos are microscopic, spherical shells of discolouration in rocks, such as granite, or biotite caused by the inclusion of radioactive grains in the rock or by deposition of radioactive material in them. One widely accepted theory is that… … Wikipedia
Радиоореол — Радиоореол[1] (англ. Radiohalo), плеохроический ореол[2][3] (англ. pleochroic halos) микроскопическая шаровидная оболочка с изменённой окраской, встречающаяся внутри минералов, таких как биотит, содержащихся в гранитах и других… … Википедия
