Birefringence 4+

Michel-Lévy Color Chart

Andrew Barlow

Designed for iPad

    • 5.0 • 9 Ratings
    • $2.99



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 1.20

All adds have been removed.

Ratings and Reviews

5.0 out of 5
9 Ratings

9 Ratings

Alien m👽2000 ,


It literally saved me! Thank you for creating such an amazing handy app. I introduced it to many of my friends and classmates and even some of my professors and they were absolutely blown away by its simplicity...I’m just kinda sad about how underrated it is. Well done!

Developer Response ,

Thanks so much for the review! It’s really appreciated! Andy ,

A better Michel-Levy chart

Birefringence adds value to the classic Michel-Levy interference color chart by leveraging the intuitive interface of yor mobile device. Scientifically sound and thoroughly documented. An outstanding tool for optical petrography research and education!

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!

App Privacy

The developer, Andrew Barlow, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

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