Definition of Extinction angle

1. Noun. The angle from its axis that a crystal must be rotated before appearing maximally dark when viewed in polarized light.

Exact synonyms: Angle Of Extinction
Generic synonyms: Angle

Medical Definition of Extinction angle

1. The angle between the nearer vibration direction and a prominent direction of the crystal. It never exceeds 45 degrees (05 Aug 1998)

Extinction Angle Pictures

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Lexicographical Neighbors of Extinction Angle

extinct language
extinct languages
extinct volcano
extinct volcanoes
extinction angle (current term)
extinction coefficient
extinction factor
extinction oblique
extinction parallel
extinction symmetrical

Literary usage of Extinction angle

Below you will find example usage of this term as found in modern and/or classical literature:

1. Manual of Petrographic Methods by Albert Johannsen (1918)
"Maximum extinction angle.—In the determination of feldspars, ... and many other minerals, it is necessary to determine the maximum extinction angle. ..."

2. Manual of Petrographic Methods by Albert Johannsen (1918)
"The inclination of H to the direction of the slow ray was 10° to 15°, consequently the mineral was negative. 440. Maximum extinction angle. ..."

3. A Text-book of Mineralogy: With an Extended Treatise on Crystallography and by Edward Salisbury Dana, William Ebenezer Ford (1922)
"Measurement of the extinction angle. — It frequently becomes important to measure as accurately as possible the extinction angle of a sec- ..."

4. The Methods of Petrographic-microscopic Research, Their Relative Accuracy by Frederic Eugene Wright (1911)
"Under these conditions the radii, which make an angle with the vertical diameter OM equal to twice the extinction angle, are evidently the planes containing ..."

5. Elementary Chemical Microscopy by Emile Monnin Chamot (1921)
"In the case of crystals exhibiting parallel extinction the extinction angle may be considered as being o degrees. Crystals exhibiting oblique extinction, ..."

6. Report by Tasmania Dept. of Mines (1897)
"The next most important phenocrysts are those of a green pleochroic augite, with an extinction angle not exceeding 33°. a light green, С deep green, ..."

7. Petrology for Students: An Introduction to the Study of Rocks Under the by Alfred Harker (1908)
"This maximum extinction-angle is a specific character, being nearly the ... In the former case longitudinal sections may give any extinction-angle from zero ..."

8. Mineralogy: An Introduction to the Scientific Study of Minerals by Henry Alexander Miers (1902)
"The angle made by one of the extinction lines of any face with a definite edge of the crystal is called the " extinction angle of the face. ..."

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