Iolite fragment transmission
This is a slightly worn fragment of iolite approximately 24 x 18 x 11 mm. This transmission spectrum is measured along an intermediate axis where the colour is a blueish-white. The absorption line positions are marked here from previous measurements.
The image is a 15 exposure focus-fused set taken with the camera - at f/13 - mounted on a mechanical track.
Iolite is sometimes known as 'water sapphire' for reasons that are apparent from this image.
Iolite fragment transmission
This is a slightly worn fragment of iolite approximately 24 x 18 x 11 mm. This transmission spectrum is measured along an intermediate axis where the colour is a blueish-white. The absorption line positions are marked here from previous measurements.
The image is a 15 exposure focus-fused set taken with the camera - at f/13 - mounted on a mechanical track.
Iolite is sometimes known as 'water sapphire' for reasons that are apparent from this image.