extinction angle

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Small, white rat (genus Rattus) on a glass table. (rodent, laboratory, experiment)

Cruel and Unusual Punishments: 15 Types of Torture

Ruminant. Deer. Red deer. Cervus elaphus. Buck. Stag. Antlers.

9 of the World’s Deadliest Mammals

Jackson (Wyoming, United States). Jackson Lake (also called Jackson Hole), southern end of the Teton Range (the Grand Tetons), Grand Teton National Park, Wyoming, USA

7 Wonders of America

Nativity Scene, Adoration of the Magi, Church of the Birth of the Virgin Mary, Montenegro

Why Is Christmas in December?

Leonardo da Vinci (1452-1519), Italian Renaissance painter from Florence. Engraving by Cosomo Colombini (d. 1812) after a Leonardo self portrait. Ca. 1500.

10 Famous Artworks by Leonardo da Vinci

American bison (Bison bison) also known as buffalo or plains buffalo on the prairie, western U.S.

What’s the Difference Between Bison and Buffalo?

Black widow spider

9 of the World’s Deadliest Spiders

extinction angle

crystals

Learn about this topic in these articles:

amphiboles

In amphibole: Physical properties
…properties, including two directions of cleavage at approximately 56° and 124°, six-sided basal cross sections, characteristic colour, and pleochroism (colour variance with the direction of light propagation). Orthorhombic amphiboles exhibit less intense pleochroism than the monoclinic amphiboles.
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pyroxenes

In pyroxene: Physical properties
…in that they have parallel extinction.
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