An interactive Michel-Lévy interference color chart that features a database of 562 minerals. Click on your observed color and section thickness, and the birefringence of your section will be automatically calculated, and candidate minerals will be suggested. The range of the chart can be be set to between 200 nm and 2500 nm. The chart can be offset by + or - λ, + or - λ/4. The chart can be used as a traditional nomogram, or displayed in a "simple" mode without the clutter of radial lines (which are no longer necessary on an interactive chart). Based on the methods of Sørensen (2013), the colors in the chart are a much truer representation of the colors seen at the microscope eye pieces than existing printed nomograms. The app includes optical and physical characteristics of candidate minerals including birefringence (minimum, maximum and mean), relief, optical character, pleochroism, color and cleavage.

The app includes the Raith-Sørensen color chart, which is also interactive. The Raith-Sørensen chart is a direct representation of interference color as a function of birefringence and sample thickness (Sørensen 2013).

A useful utility for polarized light microscopy, polariscopy, optical mineralogy, stress optics, or anyone with an interest in birefringent materials.

What’s New

Version 1.09

The Raith–Sørensen chart has been made much more interactive.

A panel in the chart view now shows the observed color, as well as the colors plus and minus λ.

Ratings and Reviews

5.0 out of 5
4 Ratings

4 Ratings

ezcheezbob ,

Great for quick Petrography reference!

Very useful quick reference. I appreciate the interactive nature of the charts, and the “compensator” function.

Developer Response ,

Thanks so much for the review!

HellaNice03 ,

So dope!!

Great job with this app.

Developer Response ,

Thanks! I really appreciate the review.


Andrew Barlow
18.1 MB

Requires iOS 11.2 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

More By This Developer

You May Also Like