"A (010) cleavage flake of plagioclase." -Johannsen, 1908

Plagioclase

"A (010) cleavage flake of plagioclase." -Johannsen, 1908

"The (010) face of a Carlsbad twin of plagioclase." -Johannsen, 1908

Plagioclase Twin

"The (010) face of a Carlsbad twin of plagioclase." -Johannsen, 1908