twinning

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Figure 2: Calcite crystals. Some of the many fairly common crystal habits represented by natural calcite crystals are illustrated here.

Relations between lamellar twinning and cleavage planes in dolomite and calcite. This difference can be discerned best when thin sections of the minerals are viewed under a microscope.

Figure 2: Twinning in feldspars.

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San Francisco, California/USA-1/18/20: Womens March at Civic Center marching with signs of political protest regarding equality also embracing 2020 presidential candidates and celebrating equality

How Does the U.S. Government Define the Difference Between a Protest and a Riot?

Paul Revere. "The bloody massacre perpetrated in King Street Boston on March 5th 1770 by a party of the 29th Regt.," engraved by Paul Revere. Boston Massacre.

There’s a Riot Goin’ On: Riots in U.S. History (Part One)

Salem Witch Trials. Photogravure after the painting by Walter McEwen titled - The Witches - circa 1890s.

How Rye Bread May Have Caused the Salem Witch Trials

Middle East bee locator map

Are the Middle East and the Near East the Same Thing?

African Americans demonstrating for voting rights in front of the White House as police and others watch, March 12, 1965. One sign reads, "We demand the right to vote everywhere." Voting Rights Act, civil rights.

Timeline of the American Civil Rights Movement

Scolex (head) of the tapeworm Taenia solium. The hooks of the scolex enable the tapeworm to attach to the intestinal wall.

Uninvited Guests: The 7 Worst Parasitic Worms

Statue of Nostradamus

Nostradamus and His Prophecies

twinning: Related Content

Written and fact-checked by The Information Architects of Encyclopaedia Britannica

Photos

Figure 2: Calcite crystals. Some of the many fairly common crystal habits represented by natural calcite crystals are illustrated here.

Relations between lamellar twinning and cleavage planes in dolomite and calcite. This difference can be discerned best when thin sections of the minerals are viewed under a microscope.

Figure 2: Twinning in feldspars.

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Topics

twin axis albite twin twin plane twin centre Carlsbad twin grid twinning penetration twin crystal deformation and flow slip radiation damage liquid crystal pleochroism double refraction strain symmetry polymorphism Brewster’s law crystal defect