Quartz Inclusions with Brazil Law Twinning
 Photo: E. Skalwold Brazil Law twinning as seen along c-axis cross-sections of quartz inclusions in chalcedony. A creation of lapidary artist Falk Burger in collaboration with Nature. |
 Photo: E. Skalwold The very center of the "starburst" is untwinned, exhibiting a bull's eye optic figure. Moving out from the center, the quartz is twinned. The left and right twin lamellae are very fine and more difficult to discern than those with Brewster fringes. |
 Photo: E. Skalwold All the cross-sections exhibit the optical effect under crossed polars, though it is difficult to have several strong displays at once for a photo. (small changes in thickness and orientation dramatically change the display and colors). |
 Photo: E. Skalwold Non-polarized light. Fine needle inclusions. |
| Visit Falk Burger's gallery at Hard Works to view more of his fantastic lapidary art. |
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