• WordNet 3.6
    • n greisen a granitic rock composed of quartz and mica
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Webster's Revised Unabridged Dictionary
    • n Greisen (Min) A crystalline rock consisting of quarts and mica, common in the tin regions of Cornwall and Saxony.
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Century Dictionary and Cyclopedia
    • n greisen A rock of the granitic family, having a crystalline-granular texture, and chiefly made up of quartz and mica. Its relations to granite are such as to lead lithologists to believe that it is an altered form of that rock, in which the feldspar has been replaced by quartz, at the same time that various accessory minerals, very characteristic of the greisen, have made their appearance. These accessory minerals are topaz, fluor-spar, rutile, tourmaline, and others, and especially cassiterite (oxid of tin), which is almost invariably found associated with this rock. Greisen is a very characteristic rock of the Erzgebirge and of its tin-mines. See granite.
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In literature:

Cassiterite usually occurs as veins or impregnations in granitic rocks, and is especially associated with the quartz-mica rock called greisen.
"Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 4" by Various
Greisen occurs typically in belts or veins intersecting granite.
"Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 5" by Various

In news:

Jenna Fazzino and Justin Greisen .
IN EFFECT UNTIL SEP 23, 12:00 p.m. STUART — Jenna Fazzino of Stuart, daughter of Philip and Virginia Fazzino of Palm City, is engaged to Justin Greisen of Stuart.
Find Chris Greisen news, scores, and stats at
CourtesyIsabella (Emma Eldridge) speaks with Escalus (Paul Greisen) in a scene from?Measure for Measure.

In science:

The data were imported into AIPS (Greisen 1988), amplitude calibrated (with the measured or expected system temperature and, if needed, the autocorrelation normalised) then fringe fitted.
Conclusions from the image analysis of the VSOP Survey
One of the most interesting features related to the physics of UHECRs is the Greisen-Zatsepin-Kuzmin (GZK) cut off [93, 94], a suppression of the high-energy tail of the UHECR spectrum arising from interactions with CMB photons, according to pγ → ∆+ → pπ0 (nπ+ ).
Lorentz Violation: Motivation and new constraints
Greisen 2009, private communication), which is sufficient for most of the current arrays but is not enough for a full simulation of, for example, the LOFAR array at the level of individual dipole elements.
SKA HI end2end simulation
Indeed, the most energetic cosmic rays cannot propagate very far (i.e. not much more than ∼ 100 Mpc), without loosing most of their energy by interactions with photons from the Cosmic Microwave Background (the so-called GZK effect; Greisen, 1966; Zatsepin and Kuz’min, 1966).
Testing the isotropy of high energy cosmic rays using spherical needlets
Soon after the microwave echo of the big bang was discovered, Greisen , Zatsepin, and Kuzmin (GZK) noted that the relic photons make the universe opaque to cosmic rays (CRs) of sufficiently high energy.
Summary Report of JEM-EUSO Workshop at KICP in Chicago