Enstatite

The dark reddish brown alpha ray is seen here to absorb almost all light up to about 490nm. The sharp line at 506nm. is strong and broad and the narrow band at 548nm. is pronounced.

Color due to iron. In the darker brown stone’s lines may be seen in the green and blue areas of the spectrum. However, in the paler brownish yellow variety usually the narrow diagnostic line at 506nm. is the only line seen

Color due to iron. Here we can just make out the strong broad band centered at 425nm. which cuts off transmission about 430nm. The next visible strong narrower band appears at 449nm. followed by two vague weak bands in the blue before the strong sharp line at 506nm. Beyond this in the green is an indication of a very faint line at 548nm.

Color due to iron. A strong sharp single line at 506nm. in the blue green is seen here in this attractive bright orange variety of enstatite. There are several other bands that maybe seen though relatively weak and vague. Some faint lines may be seen in the blue, but these are best seen in the darker brown varieties

The paler brownish green gamma ray allows more transmission in the violet - blue area to reveal the bands in the blue before the strong sharp line at 506nm. and very faint absorption in the green at 548nm. Another very weak narrow line can be seen at 502nm. close to the strong sharp line at 506nm. which may also be accompanied by another line on the long wave side line at 509nm in darker stones.