B
Labradorite from Brewster County, Texas. Both stones are pale yellow. One and a half times natural size.
[Plate III]
A
Pink microcline crystal from Burnet County, Texas.
B
Smoky quartz from Burnet County, Texas. Natural size. Colorless crystal at center back is included for color comparison.
[Plate IV]
Polished agate from gravels of the Rio Grande near Zapata, Zapata County, Texas. Bands are blue and gray; other inclusions are brown, yellow, and reddish. One and a half times natural size.