undulose extinction

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Undulose extinction — is a geological term referring to the type of extinction that occurs in certain minerals when examined in thin section under cross polarized light. As the microscope stage is rotated, individual mineral grains appear black when the polarization… … Wikipedia
Undulöse Auslöschung — bei Quarz in Orthogneis Dünnschliff eines Sandsteins unter Polarisat … Deutsch Wikipedia
Extinction (disambiguation) — Extinction or extinct may refer to:In science:* In the physical sciences, extinction is another word for the attenuation of radiation by absorption and/or scattering. ** Extinction coefficient, a measure of how well a material attenuates… … Wikipedia
Litchfieldite — is a rare metamorphosed igneous rock. It is a variety of nepheline syenite and is composed of two near pure phases of feldspar, albite and microcline, with predominance of the first one, plus nepheline, sodalite, cancrinite and calcite. The mafic … Wikipedia
Dynamic quartz recrystallization — Quartzite from Southern Appalachians. Thin section prepared by Michael Stevens. Quartz is the most abundant single mineral in the earth s crust (behind the feldspar group),[1] and as such is present in a very large proportion of rocks both as… … Wikipedia

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